Pan Reptilia Flashcards
Stem Reptiles have what conditions
Diapsid condition!
Crown Lepidosauria is defined by the split between
Squamata & Rhyncoephalia
Rhycocephalia
Found in New Zealand islands, 2 species
Fully aquatic, fossorial, herbivores
Pan Squamata
True lizards and snakes
Iguanidae, Serpentes anguidae
Stem Squamata
Huehuechuetzpalli and Kuehneosauridae
Turtles
Phylogenetic position is contested
Crown Turtles are defined by the split between
Cryptodira (hidden neck) and Pleurodira (side neck)
Eunotosaurus Africanus
9 T shaped ribs, perichondral collar, osteoderms
Trunk Stiffened
Redundancy in respiratory mechanics allow ribs to widen
Modified Lung Ventilation
When we say “Modified Lung Ventilation” with Eunotosaurus Africanus, what do we mean?
Abdominal & intercostal muscles
Muscular sling
Sharpey’s fibers
More Eunotosaurus Africanus Information
Stiffening of trunk
- increases torque of limbs
Advantageous for forelimbs digging
UTF? Covered in supratemporal bone, o there’s a diapsid condition that becomes a secondary anapsid condition
What is Deep Coalescence
Conserved genetic polymorphism
- Gene tree-species tree discordance
–incomplete lineage sorting
- hemiplasy
What does incomplete lineage sorting mean?
Gene basicallyy becomes polymorphic and a new allele emerges & that mutated allele s conserved through time and can get differential survival of the allele in these species
