EEB388H1 Lecture Notes - Multituberculata, Probainognathus, Morganucodon

• School: UTSG
• Department: Ecology & Evolutionary Biology
• Course: EEB388H1
• Professor: ergnstorm

Document Summary

Oldest mammals/synapsids are known from the pennsylvanian 318- 319 mya (cenozoic for mammals), paleozoic for synapsids aka ancestors of mammals may even originate before that. Skull fenestration: anapsid : no temporal openings, most amniotes come from, synapsid: 1 temporal openings (mammals evolve from this) Temporal fossae in mammals is the reminent of this. Between 3 bones: post orbital(this fuses in most extant), squamosal, jugal: diapsid : 2 openings. More derived and more mammal like: thorapsids @ the pernian. Family ophiacodontidae: large skulled predators includes oldest know synapsid arcaothryris from nova scotia, all pelycosaurs went extinct before the end of the permian. Family eothyridae: small lightly build carnivores with small maxilla but large canines. Family caseidae: herbivorous, very small gead among largest pelycosaurs. Family varanopsidae: also small agile predators. Family edaphosauridae: herbivorous, small head characteristic dorsal snail supported by elongate neural spines. Family sphenacodontidae: large head with large maxillary canines. 1: many with elongate neural spines such as dimetron, sister to.