EEMB 136L Lecture 15: Lab 15
15 Nov 2017
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Document Summary
Distinguished based on the presence, number, location of the temporal fenestrae (holes in the skull located behind the eye)-> function to allow jaw muscle to be attached to a greater sa on the skull, so resulting in stronger muscle. 2 pairs of temporal fenestrae, a lower one and an upper one. Arose by secondary lose of the lower temporal fenestrae. Synapomorphy: presence of a suborbital foramen (a hole in the roof mouth below the eyes) Animals that lived in freshwater and brackish environments. Earliest known amniotes to have return to life in the water. Distribution is a piece of evidence for continental drift. Only living group of amniotes to retain the plesiomorphic anapsid condition condition. Aquatic diapsids that have lost 1 pair of temporal fenestrae to achieve a euryapsid skull. Antorbital fenestrae (additional opening in the skull in front of the eyes to make the skull lighter) 1st group of flying reptiles; wings supported by a highly elongated fourth finger.
