Features of Superclass Gnathostomata (jaw- bearing animals):
Characteristics of Class Placodermi (Extinct):
The class Placodermi is considered as first set of fish with jaws but is now extinct. Members of the class had the given characteristics:
Cartilaginous fishes contain the given characteristics:
Class Chondrichthyes is separated in two extant subclasses:
Subclass: Elasmobranchii (sharks, rays and skates)
Subclass: Holocephali (chimaera, at times known as ghost sharks). Members of class Chondrichthyes contain backbone which is composed of cartilage. They are not fishes you come across frequently because of their marine.
Features of Class Osteichthyes (Bony fish)
Members of this class have the given features:
The Osteichthyes are characterized by endochondral ("spongy") bone in endoskeleton, dermal fin rays composed by lepidotrichiae (altered, tile-shaped scales), and 3 pairs of tooth-bearing dermal bones lining jaws (dentary, premaxillary and maxillary). Osteichthyes comprise 2 main subclasses, Actinopterygii and Sarcopterygii.
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