Mesoglea

Budding In Hydra

Order: Reorder
Duration: 1:27
Published: 2010-05-05
Uploaded: 2010-11-04
Author: TutorVista

Check us out at www.tutorvista.com Budding in hydra has received the attention of only a few investigators. Our principal information as to the origin of the bud is derived from Lang's' account. He describes the bud as beginning by an increase in volume and division of the interstitial cells. After the ectoderm becomes thickened, the mesoglea dis appears and the cells pass from the ectoderm into the endoderm. This process continues until the ectoderm becomes reduced to its normal thickness. The mesoglea then reforms and a cavity ap pears in the thickened endoderm, which becomes the enteron of the new individual. The main object of the present paper will be to give a brief account of the origin and development of the buds in hydra, more especially their manner of growth and what cells contribute most to their rapid formation. The species studied, Hydra viridis and Hydra sp.? (Brauer) differ somewhat from Lang's account. The mesoglea does not disappear and the ectodermal cells do not pass into the endoderm. The bud, however, begins by an increase in volume and division of the interstitial cells. After they have increased once or twice in volume, as shown in Fig. i, there is a slight outbulging of the ectoderm, which is scarcely perceptible. represents the condition of the interstitial, ectodermal and endodermal cells in the origin of the bud as they appear more highly magnified. A few mitotic figures are visible. No amitotic divisions were observed. The endodermal cells ...

Hydra Fusca polyp in my Aquarium.

Order: Reorder
Duration: 3:44
Published: 2009-05-24
Uploaded: 2010-12-14
Author: mV33rs

This video is taken with my Canon EOS 1000D. I set it up for remote shooting and captured my screen. Sometimes the video gets really blurry because I had to use manual focus. Also the video speed is 2 times the normal speed. Hydra is included in the phylum Cnidaria, along with sea anemones, jellyfish and coral polyps, and is one of the few freshwater members of this group. One feature all members of the Cnidaria have in common is the possession of thread cells or cnidia or nematocysts -- tiny stinging cells located in the body and tentacles which discharge a paralyzing poison into prey organisms, enabling their capture and ingestion. The nematocysts of Hydra are similar to those of the marine stinging jellyfish which periodically invade beaches, causing injury and sometimes death to humans. The Hydra's body is a hollow tube consisting of two layers of cells separated by an unstructured gelatinous layer. The outer, clear layer of cells is called the epidermis or ectoderm, and generates the nematocysts. The inner layer is called the endoderm or gastrodermis, and produces the enzymes which digest the Hydra's food. The separating layer is called the mesoglea. It is a gel of various secretions and proteins, containing loose cells not organised into any kind of tissue. The Hydra's tentacles are hollow, tubular extensions of these three layers. Many members of the Cnidaria establish symbiotic relationships with zoochlorellae which impart a green colour to the polyp. Coral polyps ...

Picadura en el pie por malagua, medusa, aguamala o yellyfish

Order: Reorder
Duration: 1:52
Published: 2010-08-07
Uploaded: 2010-09-29
Author: johnnypoll1970

Enviado por " CONSULTORIO MÉDICO JAVIER FLORES BUISSON " MÁNCORA- PERÚ... URL: consultoriomedicofloresmancora.es.tl ... En coordinación con "Punta Pacífico Bungalows - Máncora"- mancorapuntapacifico.es.tl En este caso la picadura ocurrió en el segundo dedo del pie. Inmediatamente y debido al gran dolor se infiltra anestesia y se limpia toda el área con alcohol y se introduce el bisel de una aguja estéril pequeña número 25 a través del orificio buscando algún pequeño tentáculo. Las medusas (también llamadas aguamalas, malaguas, aguavivas o lágrimas de mar) son organismos marinos pertenecientes al filo Cnidaria y al de los Celentéreos; son pelágicos, de cuerpo gelatinoso, con forma de campana de la que cuelga un manubrio tubular, con la boca en su extremo inferior, a veces prolongado por largos tentáculos cargados con células urticantes llamados cnidoblastos. Se caracterizan por su movilidad, y variabilidad mesoglea. Aparecieron hace unos 500 millones de años. El Instituto de Ciencias del Mar de Barcelona (web oficial), dependiente del CSIC ofrece los siguientes consejos ante el contacto con una medusa común No frotar la zona afectada con arena ni con la toalla. No limpiar la zona de la picadura con agua dulce, usar siempre agua salada. Aplicar frío sobre la zona afectada durante 15 minutos usando una bolsa de plástico que contenga hielo. Nunca aplicar hielo directamente a no ser que sea de agua marina. Si el dolor persiste conviene aplicar de nuevo la bolsa de hielo ...

Alien Creatures From The Deep

Order: Reorder
Duration: 4:04
Published: 2010-12-17
Uploaded: 2011-02-24
Author: leosupercluster

Ctenophores Although known as comb jellies and endowed with delicate gelatinous tissue like cnidarian jellies, ctenophores are only very distantly related to hydromedusae and scyphomedusae. Unlike the true jellies (cnidarians), comb jellies lack stinging nematocysts and have developed other strategies, such as sticky tentacles and oral lobes to capture prey. The ctenophore body exhibits bi-radial symmetry (with an underlying bilateral symmetry), which is a bit different than the radial symmetry typical of cnidarian medusae. The signature characteristic of ctenophores are the comb rows. Formed by plates of closely-spaced cilia that are fused at the bases, comb rows beat in a wave pattern that moves from the aboral to the oral end. Comb jellies are the largest of all animals that utilize the beating of cilia for locomotion. It doesn't stop there - with lengths up to 2 mm, ctenophore cilia are the longest of any known. Each single comb within a row is made up of several thousand cilia, and each row may have dozens of combs, so an individual ctenophore is endowed with many thousands of cilia. All adult ctenophores possess eight comb rows, which easily distinguish them from any other type of gelatinous animal. A strikingly beautiful shimmering rainbow pattern is produced by the diffraction of light passing between the cilia. Most ctenophores are capable of bioluminescence, which is quite faint and only visible in darkened conditions. The dim glow is typically confined to the ...

Wart Comb Jelly/jellyfish shimmering rainbow colored space ship/alien Monterey Aquarium

Order: Reorder
Duration: 0:29
Published: 2008-12-31
Uploaded: 2010-09-20
Author: JamesHGraff

Wart Comb Jellyfish shimmering rainbow colored space ship/alien Monterey Aquarium - Mnemiopsis sp. - comb jelly Highly transparent, elongated body, round in cross-section, with semi-transparent rows running the length of the animal. Size: less than 1 inch to 4 inches. No sting. Jellyfish don't have specialized digestive, osmoregulatory, central nervous, respiratory, or circulatory systems. They digest using the gastrodermal lining of the gastrovascular cavity, where nutrients are absorbed. They do not need a respiratory system since their skin is thin enough that the body is oxygenated by diffusion. They have limited control over movement, but can use their hydrostatic skeleton to accomplish movement through contraction-pulsations of the bell-like body; some species actively swim most of the time, while others are passive much of the time. Jellyfish are composed of more than 90% water; most of their umbrella mass is a gelatinous material - the jelly - called mesoglea which is surrounded by two layers of epithelial cells which form the exumbrella (top surface) and subumbrella (bottom surface) of the bell, or body. Jellyfish do not have a brain or central nervous system, but rather have a loose network of nerves, located in the epidermis, which is called a "nerve net". A jellyfish detects various stimuli including the touch of other animals via this nerve net, which then transmits impulses both throughout the nerve net and around a circular nerve ring, through the rhopalial ...

CREATURES Caught on Video!!!

Order: Reorder
Duration: 0:37
Published: 2011-01-08
Uploaded: 2011-02-09
Author: larutaverde

Las medusas (también llamadas aguamalas, malaguas, aguavivas o lágrimas de mar) son organismos marinos pertenecientes al filo Cnidaria y al de los Celentéreos; son pelágicos, de cuerpo gelatinoso, con forma de campana de la que cuelga un manubrio tubular, con la boca en su extremo inferior, a veces prolongado por largos tentáculos cargados con células urticantes llamados cnidocitos. Se caracterizan por su movilidad, y variabilidad mesoglea. Aparecieron hace unos 500 millones de años. VERY WEIRD CREATURES Modern creatures Other legendary creatures are thought to exist even today, but evidence is lacking. Famous examples are chupacabras, Bigfoot, Yeti, the Loch Ness Monster, and even space aliens. These are called cryptids by cryptozoologists.

Cnidaria

Order: Reorder
Duration: 1:50
Published: 2010-11-29
Uploaded: 2010-11-29
Author: biodiversity10

here come cnidaria causing some hysteria got two body forms polyp and medusa you better watch out cause they'll sting yousa four main classes anthozoa scyphozoa cubozoa hydrozoa yeeeeeeeeeee (word) in the anthozoa we have sea anemone coral sea pens all living in the salty sea cubozoa box jellies hydrozoa man-of-wars scyphozoa jellyfish dance like a jellyfish jelly jelly jellyfish asexual budding or formation of gametes snacking on plankton and other tasty tasty treats made of mesoglea a jelly-like matterrrr tissues but no organs they aint got no bladder here come cnidaria causing some hysteria let's talk anthozoa sea anemonessssss here we go-a

touching a beached jellyfish

Order: Reorder
Duration: 0:16
Published: 2010-11-08
Uploaded: 2010-11-08
Author: ThePicoides

Will I get stung by touching the top of a jellyfish that has been beached at low tide? Use your knowledge of jellyfish structure to decide before watching the video.

Amazing Jellyfish Sex Wart Comb Jelly rainbow color space ships aliens mating Monterey Aquarium

Order: Reorder
Duration: 4:14
Published: 2009-01-02
Uploaded: 2011-02-13
Author: JamesHGraff

Incredible Wart Comb Jellyfish - mating and dancing with one another! like shimmering rainbow colored Star Wars space ships or aliens mating - and invading the Black and Caspian Seas causing serious problems to those ecosystems and the people who feed off these now unbalanced ecosystems! Mnemiopsis sp. - comb jelly Highly transparent, elongated body, round in cross-section, with semi-transparent rows running the length of the animal. Size: less than 1 inch to 4 inches. No sting. Jellyfish are free-swimming members of the phylum Cnidaria. They have several different basic morphologies that represent several different cnidarian classes including the Scyphozoa (about 200 species), Staurozoa (about 50 species), Cubozoa (about 20 species), and Hydrozoa (about 1000-1500 species that make jellyfish and many more that do not)[1][2]. The jellyfish in these groups are also called, respectively, scyphomedusae, stauromedusae, cubomedusae, and hydromedusae; "medusa" (plural "medusae") is another word for jellyfish. Jellyfish are found in every ocean, from the surface to the deep sea. Some hydrozoan jellyfish, or hydromedusae, are also found in fresh water. Most of the information about jellyfish that follows in this article is about scyphozoan jellyfish, or scyphomedusae. These are the big, often colorful, jellyfish that are common in coastal zones worldwide. In its broadest sense, the term jellyfish is sometimes used also to refer to members of the phylum Ctenophora. Although not ...

Medusas en el Acuario Guadalajara, Jalisco, México.

Order: Reorder
Duration: 0:34
Published: 2009-09-22
Uploaded: 2010-08-26
Author: carlosomar100

Las medusas (también llamadas aguamalas o aguavivas) son organismos marinos pertenecientes al filo Cnidaria; son pelágicos, de cuerpo gelatinoso, con forma de campana de la que cuelga un manubrio tubular, con la boca en su extremo inferior, con células urticantes llamados cnidoblastos. Se caracterizan por su movilidad, y variabilidad mesoglea. Aparecieron hace unos 500 millones de años.

Comb Jellies

Order: Reorder
Duration: 0:30
Published: 2010-07-27
Uploaded: 2010-08-23
Author: llikdaor123

Comb Jellies Known commonly as the sea walnut, these jellies are oval in shape and have tiny rows of comb-like plates running down their bodies. As they swim, these plates diffract (or bend) light to produce a shimmering, rainbow effect. Did you know? Comb jellies lack stinging cells. www.mysticaquarium.org Ctenophores are usually colorless and transparent, although some species are known to have red, black, orange or golden pigmentation. They mostly grow between a size of few centimeters to a foot and half long. Ctenophores tend to have a rainbow effect on the surface of their bodies, even though they are not bioluminescent. The body of the ctenophores is made up of two layers, the ectoderm (the outer layer) and the gastroderm (the inner layer. The ectoderm is a double layer of cells covered in a mucus-like substance that is secreted by special glands. The gastroderm contains a small cavity that is the stomach and is connected to the mouth with a long gullet. The gullet contains strong enzymes to help digest the food, so that by the time the food reaches the stomach, it is already half digested. The food gets fully digested in the stomach and the waste product is expelled from the body through the mouth itself, and sometimes, through two anal pores that are used very infrequently. The space in between the two layers is filled with a jelly like layer, the mesoglea. Most known species of comb jellies are spherical or oval in shape and have an extraordinary sense organ, the ...

Jellyfish reproduction

Order: Reorder
Duration: 5:09
Published: 2010-06-03
Uploaded: 2011-02-10
Author: Amphinema

How do jellyfish reproduce? Jellyfish are marvellous creatures with a gelatinous body. It is easy to recognise jellyfish! They have a convex portion called umbrella with numerous tentacles hanging from its margin. The manubrium is a tubular structure hanging from the centre of the umbrella ending with an opening which acts as both mouth and anus. The jellyfish of this video belong to the Phylum Cnidaria and the class Scyphozoa. The word "cnidarians" originates from greek and means "nettle". This name is referred to their ability to inflict painful stings by means of stinging organelles called cnidocysts, contained in the epiderm. This picture shows numerous cnidocysts on the surface of a jellyfish tentacle. These organelles contain a coiled thread often bearing spines. Here discharged cnidocysts and everted threads are showed. The cnidocyst discharge is triggered for example when the human skin or a prey are in contact with a tentacle, the thread is ejected and penetrates in the victim and a toxin is injected in its tissues. How do jellyfish reproduce? Let's see the moonjelly's (Aurelia sp.) life cycle. The life cycle of Cnidarians shows two main stages, the polyp and the medusa (or jellyfish). The polyp lives attached to the bottom while the jellyfish is free-swimming. The polyp presents mouth and tentacles direct upward while in jellyfish they are direct downward. This video shows a polyp few millimetres high. The polyp waits for an imprudent prey, for example a small ...

Medusa, acuario, veracruz.

Order: Reorder
Duration: 0:18
Published: 2009-05-16
Uploaded: 2010-08-27
Author: jesus15299

Medusa, acuario, veracruz. dicembre 2008 Las medusas (también llamadas aguamalas o aguavivas) son organismos marinos pertenecientes al filo Cnidaria; son pelágicos, de cuerpo gelatinoso, con forma de campana de la que cuelga un manubrio tubular, con la boca en su extremo inferior, a veces prolongado por largos tentáculos cargados con células urticantes llamados cnidoblastos. Se caracterizan por su movilidad, y variabilidad mesoglea. Aparecieron hace unos 500 millones de años.[1] Para desplazarse por el agua se impulsa por contracciones rítmicas de todo su cuerpo; toma agua, que ingresa en su cavidad gastrovascular y la expulsa, usándola como "propulsor". El concepto de medusa no es taxonómico sino morfológico. Muchos cnidarios tienen una alternancia de generaciones, con pólipos sésiles que se reproducen asexualmente y medusas pelágicas que llevan a cabo la reproducción sexual. Solo los antozoos carecen de forma medusa; las otras tres clases de cnidarios (hidrozoos, escifozoos y cubozoos) poseen forma pólipo y forma medusa; dichas medusas presentan características distintivas en las tres clases, de modo que se puede hablar de hidromedusas, escifomedusas y cubomedusas respectivamente Rhizostoma pulmo La aguamala o acalefo azul (Rhizostoma pulmo) es una medusa de la clase escifozoos. Umbrela: la parte más amplia de su cuerpo, de color azul violáceo, con una banda de color violeta en el borde. Ocho tentáculos compuestos por numerosos lóbulos pequeños, apéndices sensoriales y ...

Aliens invade & attack the Black & Caspian Seas!!

Order: Reorder
Duration: 0:30
Published: 2008-12-31
Uploaded: 2010-08-27
Author: JamesHGraff

Comb Jellies invade, attack and disrupt the Black & Caspian Sea ecosystems! Though the jelly-like comb jellies are classified in a different animal phylum than jellyfish (which signifies a distant relationship), they also share the jellyfish's fondness for zooplankton, along with the eggs and larvae of fish and invertebrate animals. Ctenophores commonly found in the Black Sea are Pleurobrachia pileus, Mnemiopsis (different species), and Beroe ovata. Mnemiopsis is a comb jelly native to the Atlantic coastal region between Massachusetts and southern Argentina. In its natural range, it has been known to heavily impact ecosystems by consuming vast quantities of zooplankton, eggs, and the larvae of fish and invertebrates that would otherwise support populations of more desirable species. Mnemiopsis was first observed in the Black Sea in the early 1980s, where it is thought to have been transported and dropped by the ballast water of freighters arriving from distant shores in the western Atlantic. By the late 1980s, populations of Mnemiopsis soared, populations of its favored zooplankton food plummeted, and, coincidentally, commercial catches of the zooplankton-eating anchovy (Engraulis encrasicolus) were drastically reduced. A few years ago, Mnemiopsis was accidentally introduced into the Caspian Sea, where a similar impact is beginning to be seen. Mnemiopsis sp. - comb jelly Highly transparent, elongated body, round in cross-section, with semi-transparent rows running the ...

Alien invaders disrupting Black & Caspian Sea ecosystems!

Order: Reorder
Duration: 0:52
Published: 2009-01-01
Uploaded: 2010-08-27
Author: JamesHGraff

Comb Jellies invade and disrupt the Black & Caspian Sea ecosystems! Though the jelly-like comb jellies are classified in a different animal phylum than jellyfish (which signifies a distant relationship), they also share the jellyfish's fondness for zooplankton, along with the eggs and larvae of fish and invertebrate animals. Ctenophores commonly found in the Black Sea are Pleurobrachia pileus, Mnemiopsis (different species), and Beroe ovata. Mnemiopsis is a comb jelly native to the Atlantic coastal region between Massachusetts and southern Argentina. In its natural range, it has been known to heavily impact ecosystems by consuming vast quantities of zooplankton, eggs, and the larvae of fish and invertebrates that would otherwise support populations of more desirable species. Mnemiopsis was first observed in the Black Sea in the early 1980s, where it is thought to have been transported and dropped by the ballast water of freighters arriving from distant shores in the western Atlantic. By the late 1980s, populations of Mnemiopsis soared, populations of its favored zooplankton food plummeted, and, coincidentally, commercial catches of the zooplankton-eating anchovy (Engraulis encrasicolus) were drastically reduced. A few years ago, Mnemiopsis was accidentally introduced into the Caspian Sea, where a similar impact is beginning to be seen. Mnemiopsis sp. - comb jelly Highly transparent, elongated body, round in cross-section, with semi-transparent rows running the length of ...

Jellyfish amazing Wart Comb Jelly shimmering rainbow colored space ship/alien Monterey Aquarium

Order: Reorder
Duration: 1:11
Published: 2009-01-01
Uploaded: 2010-08-26
Author: JamesHGraff

Comb Jellies invade and disrupt the Black & Caspian Sea ecosystems! Though the jelly-like comb jellies are classified in a different animal phylum than jellyfish (which signifies a distant relationship), they also share the jellyfish's fondness for zooplankton, along with the eggs and larvae of fish and invertebrate animals. Ctenophores commonly found in the Black Sea are Pleurobrachia pileus, Mnemiopsis (different species), and Beroe ovata. Mnemiopsis is a comb jelly native to the Atlantic coastal region between Massachusetts and southern Argentina. In its natural range, it has been known to heavily impact ecosystems by consuming vast quantities of zooplankton, eggs, and the larvae of fish and invertebrates that would otherwise support populations of more desirable species. Mnemiopsis was first observed in the Black Sea in the early 1980s, where it is thought to have been transported and dropped by the ballast water of freighters arriving from distant shores in the western Atlantic. By the late 1980s, populations of Mnemiopsis soared, populations of its favored zooplankton food plummeted, and, coincidentally, commercial catches of the zooplankton-eating anchovy (Engraulis encrasicolus) were drastically reduced. A few years ago, Mnemiopsis was accidentally introduced into the Caspian Sea, where a similar impact is beginning to be seen. Mnemiopsis sp. - comb jelly Highly transparent, elongated body, round in cross-section, with semi-transparent rows running the length of ...

Beautiful Rainbow Jellyfish: Wart Comb Jelly shimmering rainbow colored space ship/alien

Order: Reorder
Duration: 0:52
Published: 2008-12-31
Uploaded: 2010-08-27
Author: JamesHGraff

Comb Jellies invade and disrupt the Black & Caspian Sea ecosystems! Though the jelly-like comb jellies are classified in a different animal phylum than jellyfish (which signifies a distant relationship), they also share the jellyfish's fondness for zooplankton, along with the eggs and larvae of fish and invertebrate animals. Ctenophores commonly found in the Black Sea are Pleurobrachia pileus, Mnemiopsis (different species), and Beroe ovata. Mnemiopsis is a comb jelly native to the Atlantic coastal region between Massachusetts and southern Argentina. In its natural range, it has been known to heavily impact ecosystems by consuming vast quantities of zooplankton, eggs, and the larvae of fish and invertebrates that would otherwise support populations of more desirable species. Mnemiopsis was first observed in the Black Sea in the early 1980s, where it is thought to have been transported and dropped by the ballast water of freighters arriving from distant shores in the western Atlantic. By the late 1980s, populations of Mnemiopsis soared, populations of its favored zooplankton food plummeted, and, coincidentally, commercial catches of the zooplankton-eating anchovy (Engraulis encrasicolus) were drastically reduced. A few years ago, Mnemiopsis was accidentally introduced into the Caspian Sea, where a similar impact is beginning to be seen. Mnemiopsis sp. - comb jelly Highly transparent, elongated body, round in cross-section, with semi-transparent rows running the length of ...

Alien invaders disrupting Black & Caspian Sea ecosystems!

Order: Reorder
Duration: 0:16
Published: 2008-12-31
Uploaded: 2010-08-26
Author: JamesHGraff

Comb Jellies invade and disrupt the Black & Caspian Sea ecosystems! Though the jelly-like comb jellies are classified in a different animal phylum than jellyfish (which signifies a distant relationship), they also share the jellyfish's fondness for zooplankton, along with the eggs and larvae of fish and invertebrate animals. Ctenophores commonly found in the Black Sea are Pleurobrachia pileus, Mnemiopsis (different species), and Beroe ovata. Mnemiopsis is a comb jelly native to the Atlantic coastal region between Massachusetts and southern Argentina. In its natural range, it has been known to heavily impact ecosystems by consuming vast quantities of zooplankton, eggs, and the larvae of fish and invertebrates that would otherwise support populations of more desirable species. Mnemiopsis was first observed in the Black Sea in the early 1980s, where it is thought to have been transported and dropped by the ballast water of freighters arriving from distant shores in the western Atlantic. By the late 1980s, populations of Mnemiopsis soared, populations of its favored zooplankton food plummeted, and, coincidentally, commercial catches of the zooplankton-eating anchovy (Engraulis encrasicolus) were drastically reduced. A few years ago, Mnemiopsis was accidentally introduced into the Caspian Sea, where a similar impact is beginning to be seen. Mnemiopsis sp. - comb jelly Highly transparent, elongated body, round in cross-section, with semi-transparent rows running the length of ...

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