L2 - Fish Evolution - Evolution of Fishes Phylum Chordata...

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Evolution of Fishes Phylum Chordata Subphylum Cephalochordata Subphylum Urochordata Subphylum Vertebrata Superclass Agnatha Class Pteraspidomorphi - extinct Class Myxini – hagfishes - problematic Class Cephalaspidomorphi – includes modern lampreys Superclass Gnathostomata Class Placodermi - extinct Grade Telostomi (formerly Osteicthyes) Class Acanthodii Class Sarcopterygii Subclass Coelacanthimorpha – coelacanths Subclass Osteolepimorpha – extinct Subclass Dipnoi - lungfishes Class Actinoptergii Subclass Chondrostei Subclass Neopterygii Division Telostei Class Chondrichthyes Subclass Elasmobranchii Superorder Cladoselachimorpha Superorder Xenacanthimorpha Superorder Euselachii Subclass Holocephali - chimaeras
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Subphylum Cephalochordata - lancelets
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typical of the juvenile stage of the organism’s ancestor. Neoteny - the development of some features is retarded relative to sexual maturation resulting in sexually mature individuals with juvenile features. Subphylum Urochordata - tunicates
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L2 - Fish Evolution - Evolution of Fishes Phylum Chordata...

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