Lecture 22 - Amniote Origin And Nonavian Reptiles

Question 0

What is the name of the 5 distinct clade ?

Answer 0

Lepidosaurs: lizards, snakes , tuataras
Archosaurs : dinosaurs , living crocodilians
Sauroptyergians : extinct aquatic group
Ichthyosaurs : extinct aquatic, dolphin like . Turtles.

Question 1

Early diversification of amniotes resulted in 3 patterns of holes in temporal region of skull.

Answer 1

Anapsids : 1 opening behind eye
Synapsids : 1 pair of opening - mammals
Diapsids : 2 pairs of opening - birds & other reptiles

Question 2

Turtles and tortoises. Name of order + key traits

Answer 2

Order testudines
Key trait: - enclosed in shell consisting of a dorsal carapace & a ventral plastron
- fused to vertebrae , clavicles and ribs.
- lack teeth but have hard , keratinized plates.
- internal fertilization
Oviparous
- hatchling sex is temperature - dependant
Member: aquatic : turtles. Terrestrial : tortoises