- published: 05 Jan 2013
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The subclass Holocephali ("complete heads") is a taxon of cartilaginous fish in the class Chondrichthyes. Members of the subclass move by using sweeping movements of their large pectoral fins. They have long slender tails and live close to the seabed feeding on benthic invertebrates. They lack a stomach, food moving directly into the intestine. The earliest fossils are of teeth and come from the Devonian period. Little is known about these primitive forms, and the only surviving group in the subclass is the order Chimaeriformes. This group includes the rat fishes in the genus Chimaera, and the elephant fishes in the genus Callorhynchus.
Members of this taxon preserve today some features of elasmobranch life in Paleozoic times, though in other respects they are aberrant. They live close to the bottom and feed on molluscs and other invertebrates. The tail is long and thin and they move by sweeping movements of the large pectoral fins. The erectile spine in front of the dorsal fin is sometimes poisonous. There is no stomach (that is, the gut is simplified and the 'stomach' is merged with the intestine), and the mouth is a small aperture surrounded by lips, giving the head a parrot-like appearance. The only surviving members of the group are the rabbit fish (Chimaera), and the elephant fishes (Callorhynchus).
The spotted ratfish (Hydrolagus colliei) is a chimaera found in the north-eastern Pacific Ocean. Often seen by divers at night in the Pacific Northwest, this cartilaginous fish gets its characteristic name from a pointed rat-like tail. The ratfish lays leathery egg cases on the bottom of muddy or sandy areas which are often mistaken by divers as something inanimate. While mainly a deep-water species, it occurs at shallower depths in the northern part of its range. The generic name, Hydrolagus, comes from the Greek words ὕδωρ, meaning water, and λαγώς/λαγῶς, meaning hare, and the specific name honors Alexander Collie, who was a ship surgeon and early naturalist. The spotted ratfish is common in much of its range, not typically eaten by humans (the flesh is bland with an unpleasant aftertaste) and is not commercially caught.
While diving at Cat Rock at Anacapa Island last week I ran across this Spotted Ratfish hanging out at 20 feet. These fish are known to live 1600-3000 feet down so I was pretty excited to see one. This fish is a member of Class Chondrichthyes in the subclass Holocephali. They share many characteristics with sharks but have some big differences too. They are also known as Chimaeras and are extremely cool fish. Sorry for the shakyness of the video. I was low on air and was kind of freaking out about how cool this was. Should have slowed down and taken my time. Oh well... next time :)
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Expand your vocabulary and learn how to say new words: http://www.dictionaryvoice.com/How_To_Pronounce_Holocephali.html Please leave a Like, a Comment, and Share. Bookmark us and share: http://www.dictionaryvoice.com Twitter: https://twitter.com/DictionaryVoice Facebook: https://www.facebook.com/pages/Dictionary-Voice/750369141710497 More Pronunciations: 1) How to Pronounce Holocephali http://www.dictionaryvoice.com/How_To_Pronounce_Holocephali.html
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Spotted ratfish (Hydrolagus colliei) • Family: Chimaeridae, • Genus: Hydrolagus, • Species: H. colliei, • Phylum: Chordata, • Class: Chondrichthyes, • Subclass: Holocephali, • Order: Chimaeriformes, • Type: Fish, • Diet: Omnivore, • Avarege lifespan in the wilds: no data, • Size: female is up to 38 inches (97 cm) long, much bigger than the male. • Weight no data, •• Hydrolagus colliei, is a chimaera found in the north-eastern Pacific Ocean. More info: http://en.wikipedia.org/wiki/Spotted_ratfish
TOP 10 Craziest and Creepiest Shark Species in the World! World's most amazing photos - Part 31. ↓↓↓ INFOS ABOUT THE PHOTOS ↓↓↓ Twitter: https://twitter.com/_PhotoCollector Twitter: https://twitter.com/WildBaws The story behind the photos: Photo number 10 ("The Australian Ghost Shark") The Australian ghostshark, Callorhinchus milii, is a cartilaginous fish belonging to the subclass Holocephali. Sharks, rays and skates are the other members of the cartilaginous fish group and are grouped under the subclass Elasmobranchii. Alternative names include elephant shark, makorepe (in Māori), whitefish, plownose chimaera, or elephant fish. It is found off southern Australia, including Tasmania, and south of East Cape and Kaipara Harbour in New Zealand, at depths of 0 – 200 m. Photo number 9 ("M...
Top 10 Most Dangerous Prehistoric Sea Creatures If you are going to write a comment make sure you've got your facts right first, nothing like making yourself look like an idiot on youtube! :D Basilosaurus - Was a species of whale that hunted other whales and dolphins, it was a very successful predator until its large prey started to run out and the climate changed. Dunkloestes - Was one of the worlds first super fish, it was built like an under water tank and had bone ridges instead of teeth. it went extinct in the first worldwide mass extinction millions of years ago. Elasmosaurus - It lived in the late Cretaceous period and was a 14m killer and it had more teeth in its mouth than most other sea reptiles at the time and went extinct at the same time as the dinosaurs. Helicoprion ...
Chondrichthyes (/kɒnˈdrɪkθɨ.iːz/; from Greek χονδρ- chondr- 'cartilage', ἰχθύς ichthys 'fish') or cartilaginous fishes are jawed fish with paired fins, paired nares, scales, a heart with its chambers in series, and skeletons made of cartilage rather than bone. The class is divided into two subclasses: Elasmobranchii (sharks, rays and skates) and Holocephali (chimaeras, sometimes called ghost sharks, which are sometimes separated into their own class). Within the infraphylum Gnathostomata, cartilaginous fishes are distinct from all other jawed vertebrates, the extant members of which all fall into Teleostomi. This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
Una rinoquimera (Harriotta sp.) nadando a 10 metros por encima del fondo marino en Cañon Hidrográfico durante una inmersión del 5 al 13 de julio de la Okeanos Explorer Northeast U.S. Canyons Expedition 2013. Los quimeriformes (Chimaeriformes) son un orden de peces cartilaginosos, el único superviviente de la subclase Holocephali, que incluye las quimeras o tiburones fantasma. La morfología de estos animales se conoce desde finales del Devónico, pero en la actualidad solo sobreviven 47 especies; no obstante, la relación de las formas fósiles con las actuales es aún incierta. Video cortesía de NOAA Okeanos Explorer Program http://oceanexplorer.noaa.gov/okeanos/explorations/ex1304/logs/july14/july14.html
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