| 词条 | Ischyodus |
| 释义 |
| name = Ischyodus | fossil_range = {{fossilrange|176|23}}Middle Jurassic to Miocene | image = Ischyodus avitus .jpg | image_width = 250px | image_caption = Ischyodus avitus | regnum = Animalia | phylum = Chordata | classis = Chondrichthyes | subclassis = Holocephali | ordo = Chimaeriformes | familia = Callorhynchidae | genus = Ischyodus | subdivision_ranks = Species | subdivision =
}} Ischyodus is an extinct genus of cartilaginous fish belonging to the subclass Holocephali, which includes the modern-day chimaeras. Fossils are known from Europe (including Russia), North America, and New Zealand. Ischyodus was rather similar to the present-day chimaera Chimaera monstrosa, which is found in the Atlantic Ocean and Mediterranean Sea. Just like C. monstrosa, Ischyodus had large eyes, a long whip-like tail, small lips, large pectoral fins and dorsal fin, and a dorsal spike attached to the front of the dorsal fin. The spike probably served as a method of protection against predators, and may have been venomous, as it is in modern chimaeras.[1]Dental plates of at least two species, Ischyodus rayhaasi and Ischyodus dolloi, have been found at several sites in North Dakota.[2] References1. ^{{cite book |editor=Palmer, D.|year=1999 |title= The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals|publisher= Marshall Editions|location=London|page= 29|isbn= 1-84028-152-9}} 2. ^Hoganson, J. W. and J. M. Erickson. 2005. A new species of Ischyodus (Chondrichthyes: Holocephali: Callorhynchidae) from Upper Maastrichtian shallow marine facies of the Fox Hills and Hell Creek formations, Williston Basin, North Dakota, USA. Palaeontology 48: 709-721. {{doi|10.1111/j.1475-4983.2005.00475.x}} External links
8 : Prehistoric cartilaginous fish genera|Jurassic cartilaginous fish|Cretaceous cartilaginous fish|Paleocene fish|Prehistoric fish of Europe|Prehistoric fish of Australia|Prehistoric fish of North America|Mooreville Chalk |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。