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The skeleton is cartilaginous. The notochord is gradually replaced by a vertebral column during development, except in Holocephali, where the notochord stays intact. In some deepwater sharks, the column is reduced. As they do not have bone marrow, red blood cells are produced in the s… - Appendages
Apart from electric rays, which have a thick and flabby body, with soft, loose skin, chondrichthyans have tough skin covered with dermal teeth (again, Holocephali is an exception, as the teeth are lost in adults, only kept on the clasping organ seen on the caudal ventral surface of the male), al…
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Category:Prehistoric cartilaginous fish genera - Wikipedia
WEBPages in category "Prehistoric cartilaginous fish genera". The following 135 pages are in this category, out of 135 total. This list may not reflect recent changes .
List of prehistoric bony fish genera - Wikipedia
WEBThis list of prehistoric bony fish is an attempt to create a comprehensive listing of all genera from the fossil record that have ever been considered to be bony fish (class …
WEBChondrichthyan - Cartilaginous Fish, Elasmobranchs, Holocephali: The placoderms evidently gave rise to the bony and cartilaginous fishes. Possible chondrichthyan precursors were the petalichthyids, a group of …
WEBChondrichthyes or cartilaginous fishes are the sharks and their relatives. They have jaws and paired fins, paired nostrils, scales, two-chambered hearts, and skeletons made of …
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