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Major Clades & Shared Derived Traits in <strong>Anamniote</strong> Skulls<br />
(Features in living taxa, observed in lab)<br />
---------------------------------------------------- Vertebrata ---------------------------------------------------------------------------------<br />
------------------------------------------------ Gnathostomata ---------------------------------------------------<br />
--------------------------------------- Osteichthyes-------------------------------<br />
-------- Tetrapoda ----<br />
Cyclostomata Chondrichthyes Actinopterygii Actinopterygii Lissamphibia<br />
(Lamprey) (Sharks) (Bowfin) (Teleostii) (Frog)<br />
Paedomorphic:<br />
Endochondral<br />
skeleton fails to<br />
ossify<br />
No dermal skeleton<br />
Hemihomocercal<br />
tail<br />
Homocercal tail<br />
Tetrapoda:<br />
1 cervical vert.<br />
1 sacral vert.<br />
zygapophyses<br />
ilium<br />
lost<br />
lepidotrichia<br />
digits<br />
Lepidotrichia<br />
Cleithrum, clavicle<br />
Paired pectoral & pelvic fins<br />
Pectoral girdle: Scapulocoracoid<br />
Pelvic girdle: Ischiopubic<br />
Heterocercal tail<br />
Vertebrae