- published: 02 May 2011
- views: 2376
Euglenid
Euglenids (euglenoids, or euglenophytes, formally Euglenida, ICZN, or Euglenophyceae, ICBN) are one of the best-known groups of flagellates, which are Excavate Eukaryotes of the phylum Euglenophyta and their cell structure is typical of that group. They are commonly found in freshwater, especially when it is rich in organic materials, with a few marine, and endosymbiotic members. Most euglenids are unicellular. Many euglenids have chloroplasts and produce energy through photosynthesis, but others feed by phagocytosis, or strictly by diffusion. This group is known to contain carbohydrate paramylon.
Euglenoids descend from an ancestor that took up green algae by secondary endosymbiosis.
Structure and locomotion
Euglenoids are distinguished mainly by the presence of a pellicle (periplast), which is composed of proteinaceous strips underneath the cell membrane, supported by dorsal and ventral microtubules. This varies from rigid to flexible, and gives the cell its shape, often giving it distinctive striations. In many euglenids the strips can slide past one another, causing an inching motion called metaboly. Otherwise they move using the flagella.
This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Euglenid
Podcasts:
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Euglenid metaboly
This is a heterotrophic euglenid, perhaps a Peranema sp., exhibiting metaboly in all its splendour. The cell might be slightly squashed or otherwise damaged, keeping the flagellate conveniently in one place. The clear vesicle near the base of the flagellum that grows and shrinks is the contractile vacuole, the flagellate's analogue of the animal secretory system. At the tail end are refractile starch granules used to store energy. Metaboly is a form of cell movement that is most famously exemplified by ciliates, but also known in some other flagellates. It appears to be caused by the specific arrangement of microtubule (cell skeleton) bundles at the cell periphery, and greatly enhanced by the 'armour plates' of the euglenid surface, which is lined with long pellicle strips going from the...
published: 02 May 2011 -
Euglenid - Peranema - with flagellum
Microscopic flagellate in floodwater from our driveway
published: 25 Sep 2022 -
Euglenid
Euglenid found in Winogradsky column BIOL 3100A - Microbiology Valdosta State University
published: 21 Nov 2016 -
Euglena
Euglena are unicellular organisms that belong to the genus protist. As such, they are not plants, animals or fungi. In particular, they share some characteristics of both plants and animals. While they can manufacture their own food, a characteristic seen in plants, they are also capable of movement and consuming food, which are characteristics of animals. Due to their unique characteristics, there has been some debate as to the phylum in which Euglena should be placed. Historically they have been classified by scientists in either the phylum Euglenozoa or the phylum Euglenophyta. Euglenoids organized in the phylum Euglenophyta were grouped with algae because of the many chloroplasts within their cells. But Since other Euglena do not have chloroplasts and the ones that do! obtained them th...
published: 01 May 2020 -
Euglenid flagellate?
published: 22 Dec 2024 -
Euglenoids: Single-Celled Shapeshifters
Euglenoids have had a very, very long time to evolve, and that has led to the things they have evolved into being extremely diverse—so diverse that, combined with the varied shape-shifting abilities of its member species, euglenoids have proven challenging to both identify and classify Support Journey to the Microcosmos on Patreon: http://www.patreon.com/journeytomicro Follow Journey to the Microcosmos: Twitter: https://twitter.com/journeytomicro Facebook: https://www.facebook.com/JourneyToMicro More from Jam’s Germs: Instagram: https://www.instagram.com/jam_and_germs YouTube: https://www.youtube.com/channel/UCn4UedbiTeN96izf-CxEPbg Hosted by Hank Green: Twitter: https://twitter.com/hankgreen YouTube: https://www.youtube.com/vlogbrothers Music by Andrew Huang: https://www.youtube.com/...
published: 09 Sep 2019 -
TinyLife - Lepocinclis helicoidea, the elegant elongated euglenid
_Lepocinclis helicoidea_ is a remarkable single-celled euglenoid, known for its distinctive spiral morphology and vibrant green coloration. This protist belongs to the family Euglenaceae and stands out due to its unique structural features and ecological role. *Key Features* - Shape: _Lepocinclis helicoidea_ has an elongated, ovoid body that is distinctly helicoid, meaning it twists in a spiral manner. - Pellicle: The cell surface is covered with a pellicle that exhibits prominent helical or spiral striations. These striations not only provide structural support but also give the cell its characteristic twisted appearance. - Chloroplasts: The cell contains numerous chloroplasts, which are responsible for its green coloration. These chloroplasts enable the organism to perform photosynthesi...
published: 10 Jul 2024 -
Euglenid sp #microscope
published: 19 Jan 2025 -
Euglenid metaboly
published: 11 Nov 2016
0:52
Euglenid metaboly
- Order: Reorder
- Duration: 0:52
- Uploaded Date: 02 May 2011
- views: 2376
This is a heterotrophic euglenid, perhaps a Peranema sp., exhibiting metaboly in all its splendour. The cell might be slightly squashed or otherwise damaged, ke...
This is a heterotrophic euglenid, perhaps a Peranema sp., exhibiting metaboly in all its splendour. The cell might be slightly squashed or otherwise damaged, keeping the flagellate conveniently in one place. The clear vesicle near the base of the flagellum that grows and shrinks is the contractile vacuole, the flagellate's analogue of the animal secretory system. At the tail end are refractile starch granules used to store energy.
Metaboly is a form of cell movement that is most famously exemplified by ciliates, but also known in some other flagellates. It appears to be caused by the specific arrangement of microtubule (cell skeleton) bundles at the cell periphery, and greatly enhanced by the 'armour plates' of the euglenid surface, which is lined with long pellicle strips going from the flagellar insertion all the way to the tip of the 'tail' -- as the cell twists about, the strips slide against each other and result in this movement. Euglenids with fused pellicle strips, like Phacus, are incapable of metaboly. The function of this movement is unknown, and there may not be any in particular.
The hairy thing next to the euglenid is a badly mangled ciliate.
Freshwater, Apr 2011, Vancouver
https://wn.com/Euglenid_Metaboly
This is a heterotrophic euglenid, perhaps a Peranema sp., exhibiting metaboly in all its splendour. The cell might be slightly squashed or otherwise damaged, keeping the flagellate conveniently in one place. The clear vesicle near the base of the flagellum that grows and shrinks is the contractile vacuole, the flagellate's analogue of the animal secretory system. At the tail end are refractile starch granules used to store energy.
Metaboly is a form of cell movement that is most famously exemplified by ciliates, but also known in some other flagellates. It appears to be caused by the specific arrangement of microtubule (cell skeleton) bundles at the cell periphery, and greatly enhanced by the 'armour plates' of the euglenid surface, which is lined with long pellicle strips going from the flagellar insertion all the way to the tip of the 'tail' -- as the cell twists about, the strips slide against each other and result in this movement. Euglenids with fused pellicle strips, like Phacus, are incapable of metaboly. The function of this movement is unknown, and there may not be any in particular.
The hairy thing next to the euglenid is a badly mangled ciliate.
Freshwater, Apr 2011, Vancouver
0:57
Euglenid - Peranema - with flagellum
- Order: Reorder
- Duration: 0:57
- Uploaded Date: 25 Sep 2022
- views: 81
Microscopic flagellate in floodwater from our driveway
Microscopic flagellate in floodwater from our driveway
https://wn.com/Euglenid_Peranema_With_Flagellum
Microscopic flagellate in floodwater from our driveway
- published: 25 Sep 2022
- views: 81
1:14
Euglenid
- Order: Reorder
- Duration: 1:14
- Uploaded Date: 21 Nov 2016
- views: 84
Euglenid found in Winogradsky column
BIOL 3100A - Microbiology
Valdosta State University
Euglenid found in Winogradsky column
BIOL 3100A - Microbiology
Valdosta State University
https://wn.com/Euglenid
Euglenid found in Winogradsky column
BIOL 3100A - Microbiology
Valdosta State University
- published: 21 Nov 2016
- views: 84
2:02
Euglena
- Order: Reorder
- Duration: 2:02
- Uploaded Date: 01 May 2020
- views: 135762
Euglena are unicellular organisms that belong to the genus protist. As such, they are not plants, animals or fungi. In particular, they share some characteristi...
Euglena are unicellular organisms that belong to the genus protist. As such, they are not plants, animals or fungi. In particular, they share some characteristics of both plants and animals. While they can manufacture their own food, a characteristic seen in plants, they are also capable of movement and consuming food, which are characteristics of animals. Due to their unique characteristics, there has been some debate as to the phylum in which Euglena should be placed. Historically they have been classified by scientists in either the phylum Euglenozoa or the phylum Euglenophyta. Euglenoids organized in the phylum Euglenophyta were grouped with algae because of the many chloroplasts within their cells. But Since other Euglena do not have chloroplasts and the ones that do! obtained them through endosymbiosis, some scientists contend that they should be placed taxonomically in the phylum Euglenozoa. Euglena live in fresh and brackish water rich in organic matter and can also be found in moist soils. Euglena are characterized by an elongated cell with one nucleus, numerous chlorophyll-containing chloroplasts, a contractile vacuole, an eyespot, and one or two flagella. Certain species (e.g., E. rubra) appear red in sunlight because they contain a large amount of carotenoid pigments. Unlike plant cells, Euglena lack a rigid cellulose wall and have a flexible pellicle that allows them to change shape. Though they are photosynthetic, most species can also feed heterotrophically and absorb food directly through the cell surface via phagocytosis. Food is often stored as a specialized complex carbohydrate known as paramylon, which enables the organisms to survive in low-light conditions. Most Euglena have a life cycle consisting of a free-swimming stage and a non-motile stage. In the free-swimming stage, Euglena reproduce rapidly by a type of asexual reproduction method known as binary fission. The euglenoid cell reproduces its organelles by mitosis and then splits longitudinally into two daughter cells. When environmental conditions become unfavorable and too difficult for Euglena to survive, they can enclose themselves within a thick-walled protective cyst. Protective cyst formation is characteristic of the non-motile stage.
https://wn.com/Euglena
Euglena are unicellular organisms that belong to the genus protist. As such, they are not plants, animals or fungi. In particular, they share some characteristics of both plants and animals. While they can manufacture their own food, a characteristic seen in plants, they are also capable of movement and consuming food, which are characteristics of animals. Due to their unique characteristics, there has been some debate as to the phylum in which Euglena should be placed. Historically they have been classified by scientists in either the phylum Euglenozoa or the phylum Euglenophyta. Euglenoids organized in the phylum Euglenophyta were grouped with algae because of the many chloroplasts within their cells. But Since other Euglena do not have chloroplasts and the ones that do! obtained them through endosymbiosis, some scientists contend that they should be placed taxonomically in the phylum Euglenozoa. Euglena live in fresh and brackish water rich in organic matter and can also be found in moist soils. Euglena are characterized by an elongated cell with one nucleus, numerous chlorophyll-containing chloroplasts, a contractile vacuole, an eyespot, and one or two flagella. Certain species (e.g., E. rubra) appear red in sunlight because they contain a large amount of carotenoid pigments. Unlike plant cells, Euglena lack a rigid cellulose wall and have a flexible pellicle that allows them to change shape. Though they are photosynthetic, most species can also feed heterotrophically and absorb food directly through the cell surface via phagocytosis. Food is often stored as a specialized complex carbohydrate known as paramylon, which enables the organisms to survive in low-light conditions. Most Euglena have a life cycle consisting of a free-swimming stage and a non-motile stage. In the free-swimming stage, Euglena reproduce rapidly by a type of asexual reproduction method known as binary fission. The euglenoid cell reproduces its organelles by mitosis and then splits longitudinally into two daughter cells. When environmental conditions become unfavorable and too difficult for Euglena to survive, they can enclose themselves within a thick-walled protective cyst. Protective cyst formation is characteristic of the non-motile stage.
- published: 01 May 2020
- views: 135762
0:38
Euglenid flagellate?
- Order: Reorder
- Duration: 0:38
- Uploaded Date: 22 Dec 2024
- views: 5
- published: 22 Dec 2024
- views: 5
9:15
Euglenoids: Single-Celled Shapeshifters
- Order: Reorder
- Duration: 9:15
- Uploaded Date: 09 Sep 2019
- views: 333041
Euglenoids have had a very, very long time to evolve, and that has led to the things they have evolved into being extremely diverse—so diverse that, combined wi...
Euglenoids have had a very, very long time to evolve, and that has led to the things they have evolved into being extremely diverse—so diverse that, combined with the varied shape-shifting abilities of its member species, euglenoids have proven challenging to both identify and classify
Support Journey to the Microcosmos on Patreon:
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More from Jam’s Germs:
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Music by Andrew Huang:
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Journey to the Microcosmos is a Complexly production.
Find out more at https://www.complexly.com
Sources:
https://www.pnas.org/content/109/44/17874.short
https://www.sciencedirect.com/science/article/pii/B9780123858764000104
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0053433
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1265905/
http://tolweb.org/Euglenida/97461
https://www.ncbi.nlm.nih.gov/pubmed/22081035
https://www.tandfonline.com/doi/abs/10.2216/09-112.1
https://www.sciencedirect.com/science/article/pii/B9780123858764000104
https://www.sciencedirect.com/science/article/pii/S1146609X03000171
https://www.semanticscholar.org/paper/Sensitivity-of-Different-Endpoints-in-Euglena-to-H%C3%A4der-Muhammad/f8898833e6989f14c63860ba3d2d8dbd7b7abf3a
https://www.limnology-journal.org/articles/limn/abs/2000/02/limno20002p83/limno20002p83.html
https://www.sciencedirect.com/science/article/pii/B9780123858764000104
https://www.sciencedirect.com/science/article/pii/S0932473916300839
https://www.livescience.com/54242-protists.html
http://scienceline.ucsb.edu/getkey.php?key=3694#targetText=Euglena%20do%20photosynthesis%20using%20the,is%20because%20they%20are%20unicellular.
https://www.frontiersin.org/articles/10.3389/fevo.2015.00098/full
https://wn.com/Euglenoids_Single_Celled_Shapeshifters
Euglenoids have had a very, very long time to evolve, and that has led to the things they have evolved into being extremely diverse—so diverse that, combined with the varied shape-shifting abilities of its member species, euglenoids have proven challenging to both identify and classify
Support Journey to the Microcosmos on Patreon:
http://www.patreon.com/journeytomicro
Follow Journey to the Microcosmos:
Twitter: https://twitter.com/journeytomicro
Facebook: https://www.facebook.com/JourneyToMicro
More from Jam’s Germs:
Instagram: https://www.instagram.com/jam_and_germs
YouTube: https://www.youtube.com/channel/UCn4UedbiTeN96izf-CxEPbg
Hosted by Hank Green:
Twitter: https://twitter.com/hankgreen
YouTube: https://www.youtube.com/vlogbrothers
Music by Andrew Huang:
https://www.youtube.com/andrewhuang
Journey to the Microcosmos is a Complexly production.
Find out more at https://www.complexly.com
Sources:
https://www.pnas.org/content/109/44/17874.short
https://www.sciencedirect.com/science/article/pii/B9780123858764000104
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0053433
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1265905/
http://tolweb.org/Euglenida/97461
https://www.ncbi.nlm.nih.gov/pubmed/22081035
https://www.tandfonline.com/doi/abs/10.2216/09-112.1
https://www.sciencedirect.com/science/article/pii/B9780123858764000104
https://www.sciencedirect.com/science/article/pii/S1146609X03000171
https://www.semanticscholar.org/paper/Sensitivity-of-Different-Endpoints-in-Euglena-to-H%C3%A4der-Muhammad/f8898833e6989f14c63860ba3d2d8dbd7b7abf3a
https://www.limnology-journal.org/articles/limn/abs/2000/02/limno20002p83/limno20002p83.html
https://www.sciencedirect.com/science/article/pii/B9780123858764000104
https://www.sciencedirect.com/science/article/pii/S0932473916300839
https://www.livescience.com/54242-protists.html
http://scienceline.ucsb.edu/getkey.php?key=3694#targetText=Euglena%20do%20photosynthesis%20using%20the,is%20because%20they%20are%20unicellular.
https://www.frontiersin.org/articles/10.3389/fevo.2015.00098/full
- published: 09 Sep 2019
- views: 333041
0:21
TinyLife - Lepocinclis helicoidea, the elegant elongated euglenid
- Order: Reorder
- Duration: 0:21
- Uploaded Date: 10 Jul 2024
- views: 5
_Lepocinclis helicoidea_ is a remarkable single-celled euglenoid, known for its distinctive spiral morphology and vibrant green coloration. This protist belongs...
_Lepocinclis helicoidea_ is a remarkable single-celled euglenoid, known for its distinctive spiral morphology and vibrant green coloration. This protist belongs to the family Euglenaceae and stands out due to its unique structural features and ecological role.
*Key Features*
- Shape: _Lepocinclis helicoidea_ has an elongated, ovoid body that is distinctly helicoid, meaning it twists in a spiral manner.
- Pellicle: The cell surface is covered with a pellicle that exhibits prominent helical or spiral striations. These striations not only provide structural support but also give the cell its characteristic twisted appearance.
- Chloroplasts: The cell contains numerous chloroplasts, which are responsible for its green coloration. These chloroplasts enable the organism to perform photosynthesis
- Eyespot: It possesses a red eyespot (stigma) near the base of the flagellum, which helps in detecting light and aids in phototaxis (movement towards light).
- Flagellum: Typically has a single flagellum used for locomotion, enabling the cell to move towards light sources efficiently.
*Habitat*
- Freshwater Environments: _Lepocinclis helicoidea_ thrives in nutrient-rich freshwater habitats such as ponds, lakes, and slow-moving streams. It prefers environments with ample light to optimize its photosynthetic activity.
*Feeding*
- Photosynthesis: As a photoautotroph, _Lepocinclis helicoidea_ relies primarily on photosynthesis for energy. The chloroplasts capture light energy and convert it into chemical energy.
- Mixotrophy: In addition to photosynthesis, it can exhibit mixotrophic behavior, ingesting organic particles from the surrounding environment when necessary.
*Reproduction*
- Asexual Reproduction: Reproduces asexually through binary fission, where the cell divides to form two genetically identical daughter cells. This method of reproduction allows for rapid population expansion under favorable conditions.
*Ecological Role*
- Primary Producer: As a photosynthetic organism, _Lepocinclis helicoidea_ contributes significantly to primary production in freshwater ecosystems, forming the base of the food web.
- Nutrient Cycling: Plays an essential role in nutrient cycling by assimilating inorganic nutrients and contributing organic matter back into the ecosystem.
*Sources*
Lee, J.J. (2000). _The Illustrated Guide to the Protozoa_ (Society of Protozoologists).
J. M. Archibald, A. G. B. Simpson, and C. H. Slamovits, eds (2017). _Handbook of the Protists_ (Springer International Publishing)
*Microscope*
Bresser Researcher LCD Microscope 5702100. 100x
https://wn.com/Tinylife_Lepocinclis_Helicoidea,_The_Elegant_Elongated_Euglenid
_Lepocinclis helicoidea_ is a remarkable single-celled euglenoid, known for its distinctive spiral morphology and vibrant green coloration. This protist belongs to the family Euglenaceae and stands out due to its unique structural features and ecological role.
*Key Features*
- Shape: _Lepocinclis helicoidea_ has an elongated, ovoid body that is distinctly helicoid, meaning it twists in a spiral manner.
- Pellicle: The cell surface is covered with a pellicle that exhibits prominent helical or spiral striations. These striations not only provide structural support but also give the cell its characteristic twisted appearance.
- Chloroplasts: The cell contains numerous chloroplasts, which are responsible for its green coloration. These chloroplasts enable the organism to perform photosynthesis
- Eyespot: It possesses a red eyespot (stigma) near the base of the flagellum, which helps in detecting light and aids in phototaxis (movement towards light).
- Flagellum: Typically has a single flagellum used for locomotion, enabling the cell to move towards light sources efficiently.
*Habitat*
- Freshwater Environments: _Lepocinclis helicoidea_ thrives in nutrient-rich freshwater habitats such as ponds, lakes, and slow-moving streams. It prefers environments with ample light to optimize its photosynthetic activity.
*Feeding*
- Photosynthesis: As a photoautotroph, _Lepocinclis helicoidea_ relies primarily on photosynthesis for energy. The chloroplasts capture light energy and convert it into chemical energy.
- Mixotrophy: In addition to photosynthesis, it can exhibit mixotrophic behavior, ingesting organic particles from the surrounding environment when necessary.
*Reproduction*
- Asexual Reproduction: Reproduces asexually through binary fission, where the cell divides to form two genetically identical daughter cells. This method of reproduction allows for rapid population expansion under favorable conditions.
*Ecological Role*
- Primary Producer: As a photosynthetic organism, _Lepocinclis helicoidea_ contributes significantly to primary production in freshwater ecosystems, forming the base of the food web.
- Nutrient Cycling: Plays an essential role in nutrient cycling by assimilating inorganic nutrients and contributing organic matter back into the ecosystem.
*Sources*
Lee, J.J. (2000). _The Illustrated Guide to the Protozoa_ (Society of Protozoologists).
J. M. Archibald, A. G. B. Simpson, and C. H. Slamovits, eds (2017). _Handbook of the Protists_ (Springer International Publishing)
*Microscope*
Bresser Researcher LCD Microscope 5702100. 100x
- published: 10 Jul 2024
- views: 5
1:41
Euglenid sp #microscope
- Order: Reorder
- Duration: 1:41
- Uploaded Date: 19 Jan 2025
- views: 177
- published: 19 Jan 2025
- views: 177
2:11
Euglenid metaboly
- Order: Reorder
- Duration: 2:11
- Uploaded Date: 11 Nov 2016
- views: 63
- published: 11 Nov 2016
- views: 63
PLAYLIST TIME:
PLAYLIST TIME:
0:52
Euglenid metaboly
This is a heterotrophic euglenid, perhaps a Peranema sp., exhibiting metaboly in all its s...
published: 02 May 2011
Euglenid metaboly
Euglenid metaboly
- Report rights infringement
- published: 02 May 2011
- views: 2376
This is a heterotrophic euglenid, perhaps a Peranema sp., exhibiting metaboly in all its splendour. The cell might be slightly squashed or otherwise damaged, keeping the flagellate conveniently in one place. The clear vesicle near the base of the flagellum that grows and shrinks is the contractile vacuole, the flagellate's analogue of the animal secretory system. At the tail end are refractile starch granules used to store energy.
Metaboly is a form of cell movement that is most famously exemplified by ciliates, but also known in some other flagellates. It appears to be caused by the specific arrangement of microtubule (cell skeleton) bundles at the cell periphery, and greatly enhanced by the 'armour plates' of the euglenid surface, which is lined with long pellicle strips going from the flagellar insertion all the way to the tip of the 'tail' -- as the cell twists about, the strips slide against each other and result in this movement. Euglenids with fused pellicle strips, like Phacus, are incapable of metaboly. The function of this movement is unknown, and there may not be any in particular.
The hairy thing next to the euglenid is a badly mangled ciliate.
Freshwater, Apr 2011, Vancouver
0:57
Euglenid - Peranema - with flagellum
Microscopic flagellate in floodwater from our driveway
published: 25 Sep 2022
Euglenid - Peranema - with flagellum
Euglenid - Peranema - with flagellum
- Report rights infringement
- published: 25 Sep 2022
- views: 81
Microscopic flagellate in floodwater from our driveway
1:14
Euglenid
Euglenid found in Winogradsky column
BIOL 3100A - Microbiology
Valdosta State University
published: 21 Nov 2016
Euglenid
Euglenid
- Report rights infringement
- published: 21 Nov 2016
- views: 84
Euglenid found in Winogradsky column
BIOL 3100A - Microbiology
Valdosta State University
2:02
Euglena
Euglena are unicellular organisms that belong to the genus protist. As such, they are not ...
published: 01 May 2020
Euglena
Euglena
- Report rights infringement
- published: 01 May 2020
- views: 135762
Euglena are unicellular organisms that belong to the genus protist. As such, they are not plants, animals or fungi. In particular, they share some characteristics of both plants and animals. While they can manufacture their own food, a characteristic seen in plants, they are also capable of movement and consuming food, which are characteristics of animals. Due to their unique characteristics, there has been some debate as to the phylum in which Euglena should be placed. Historically they have been classified by scientists in either the phylum Euglenozoa or the phylum Euglenophyta. Euglenoids organized in the phylum Euglenophyta were grouped with algae because of the many chloroplasts within their cells. But Since other Euglena do not have chloroplasts and the ones that do! obtained them through endosymbiosis, some scientists contend that they should be placed taxonomically in the phylum Euglenozoa. Euglena live in fresh and brackish water rich in organic matter and can also be found in moist soils. Euglena are characterized by an elongated cell with one nucleus, numerous chlorophyll-containing chloroplasts, a contractile vacuole, an eyespot, and one or two flagella. Certain species (e.g., E. rubra) appear red in sunlight because they contain a large amount of carotenoid pigments. Unlike plant cells, Euglena lack a rigid cellulose wall and have a flexible pellicle that allows them to change shape. Though they are photosynthetic, most species can also feed heterotrophically and absorb food directly through the cell surface via phagocytosis. Food is often stored as a specialized complex carbohydrate known as paramylon, which enables the organisms to survive in low-light conditions. Most Euglena have a life cycle consisting of a free-swimming stage and a non-motile stage. In the free-swimming stage, Euglena reproduce rapidly by a type of asexual reproduction method known as binary fission. The euglenoid cell reproduces its organelles by mitosis and then splits longitudinally into two daughter cells. When environmental conditions become unfavorable and too difficult for Euglena to survive, they can enclose themselves within a thick-walled protective cyst. Protective cyst formation is characteristic of the non-motile stage.
9:15
Euglenoids: Single-Celled Shapeshifters
Euglenoids have had a very, very long time to evolve, and that has led to the things they ...
published: 09 Sep 2019
Euglenoids: Single-Celled Shapeshifters
Euglenoids: Single-Celled Shapeshifters
- Report rights infringement
- published: 09 Sep 2019
- views: 333041
Euglenoids have had a very, very long time to evolve, and that has led to the things they have evolved into being extremely diverse—so diverse that, combined with the varied shape-shifting abilities of its member species, euglenoids have proven challenging to both identify and classify
Support Journey to the Microcosmos on Patreon:
http://www.patreon.com/journeytomicro
Follow Journey to the Microcosmos:
Twitter: https://twitter.com/journeytomicro
Facebook: https://www.facebook.com/JourneyToMicro
More from Jam’s Germs:
Instagram: https://www.instagram.com/jam_and_germs
YouTube: https://www.youtube.com/channel/UCn4UedbiTeN96izf-CxEPbg
Hosted by Hank Green:
Twitter: https://twitter.com/hankgreen
YouTube: https://www.youtube.com/vlogbrothers
Music by Andrew Huang:
https://www.youtube.com/andrewhuang
Journey to the Microcosmos is a Complexly production.
Find out more at https://www.complexly.com
Sources:
https://www.pnas.org/content/109/44/17874.short
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TinyLife - Lepocinclis helicoidea, the elegant elongated euglenid
_Lepocinclis helicoidea_ is a remarkable single-celled euglenoid, known for its distinctiv...
published: 10 Jul 2024
TinyLife - Lepocinclis helicoidea, the elegant elongated euglenid
TinyLife - Lepocinclis helicoidea, the elegant elongated euglenid
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_Lepocinclis helicoidea_ is a remarkable single-celled euglenoid, known for its distinctive spiral morphology and vibrant green coloration. This protist belongs to the family Euglenaceae and stands out due to its unique structural features and ecological role.
*Key Features*
- Shape: _Lepocinclis helicoidea_ has an elongated, ovoid body that is distinctly helicoid, meaning it twists in a spiral manner.
- Pellicle: The cell surface is covered with a pellicle that exhibits prominent helical or spiral striations. These striations not only provide structural support but also give the cell its characteristic twisted appearance.
- Chloroplasts: The cell contains numerous chloroplasts, which are responsible for its green coloration. These chloroplasts enable the organism to perform photosynthesis
- Eyespot: It possesses a red eyespot (stigma) near the base of the flagellum, which helps in detecting light and aids in phototaxis (movement towards light).
- Flagellum: Typically has a single flagellum used for locomotion, enabling the cell to move towards light sources efficiently.
*Habitat*
- Freshwater Environments: _Lepocinclis helicoidea_ thrives in nutrient-rich freshwater habitats such as ponds, lakes, and slow-moving streams. It prefers environments with ample light to optimize its photosynthetic activity.
*Feeding*
- Photosynthesis: As a photoautotroph, _Lepocinclis helicoidea_ relies primarily on photosynthesis for energy. The chloroplasts capture light energy and convert it into chemical energy.
- Mixotrophy: In addition to photosynthesis, it can exhibit mixotrophic behavior, ingesting organic particles from the surrounding environment when necessary.
*Reproduction*
- Asexual Reproduction: Reproduces asexually through binary fission, where the cell divides to form two genetically identical daughter cells. This method of reproduction allows for rapid population expansion under favorable conditions.
*Ecological Role*
- Primary Producer: As a photosynthetic organism, _Lepocinclis helicoidea_ contributes significantly to primary production in freshwater ecosystems, forming the base of the food web.
- Nutrient Cycling: Plays an essential role in nutrient cycling by assimilating inorganic nutrients and contributing organic matter back into the ecosystem.
*Sources*
Lee, J.J. (2000). _The Illustrated Guide to the Protozoa_ (Society of Protozoologists).
J. M. Archibald, A. G. B. Simpson, and C. H. Slamovits, eds (2017). _Handbook of the Protists_ (Springer International Publishing)
*Microscope*
Bresser Researcher LCD Microscope 5702100. 100x
Euglenid
Euglenids (euglenoids, or euglenophytes, formally Euglenida, ICZN, or Euglenophyceae, ICBN) are one of the best-known groups of flagellates, which are Excavate Eukaryotes of the phylum Euglenophyta and their cell structure is typical of that group. They are commonly found in freshwater, especially when it is rich in organic materials, with a few marine, and endosymbiotic members. Most euglenids are unicellular. Many euglenids have chloroplasts and produce energy through photosynthesis, but others feed by phagocytosis, or strictly by diffusion. This group is known to contain carbohydrate paramylon.
Euglenoids descend from an ancestor that took up green algae by secondary endosymbiosis.
Structure and locomotion
Euglenoids are distinguished mainly by the presence of a pellicle (periplast), which is composed of proteinaceous strips underneath the cell membrane, supported by dorsal and ventral microtubules. This varies from rigid to flexible, and gives the cell its shape, often giving it distinctive striations. In many euglenids the strips can slide past one another, causing an inching motion called metaboly. Otherwise they move using the flagella.
This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Euglenid
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