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Lecture 17 Wrld Dnsr
On Land, Sea, and Air: Other Mesozoic Vertebrates
| Question | Answer |
|---|---|
| During the Paleozoic era, what was the first living land form? | Amphibian |
| What amphibians appeared in the Mesozoic and still exist today? (3) | Turtles, lizards, and snakes |
| What was a mammal with a sailed back? | Dimetrodon |
| Who did the aquatic-livers branch off of? | bipedal archosaurs |
| Which Jurassic and Cretaceous grew up to 40 ft. long? | Deinosuchus, sarcosuchus |
| Found in Gondwana, what group of cretaceous crocodylian forms developed teeth for eating plants? | Notosuchians |
| Name 3 secondarily aquatic animals. | Thalattosuchians, mosasaurs, plesiosaurs, ichthyosaurs |
| What is closest related to the Mosasaur? | Komodo Dragon |
| Diet of Mosasaur: | fish and ammonites |
| Mosasaur body characteristics: | large skulls, short necks, robust jaws with sharp teeth, very long tails which worked like fins, and hindlimbs (most likely for steering) |
| How large could Plesiosaurs get? | 2-14 meters long |
| Which aquatic groups have elongated necks and up to how many cervical vertebrae? | Plesiosaurids, cryptoclidids, elasmosaurids with 76 neck vertebrae |
| Which group had a short neck with a large number of cervical vertebrae? | Pliosaurids |
| Which group is fastest and probably chased prey? | Pliosaurs |
| Which group is slower and ambushed prey? | Long-necked plesiosaurs |
| Characteristics of Ichthyosaurs: | Diapsid, large dorsal fin, elongated skull, large eyes |
| What style of locomotion did PRIMITIVE ichthyosaurs use? | Anguilliform, lateral undulations of the body produced thrust |
| What did more advanced ichthyosaurs develop? | Tuniform body |
| Advanced locomotion of ichthyosaur? | Carangiform, lateral movement is restricted to the tail |
| Which two animals hold the largest eyes of any life form known? | Temnodontosaurus and Opthalmosaurus |
| What kind of bones did pterosaurs have? | pneumatized bones |
| Which group of pterosaurs possessed long tails? when and characteristics? | Eudimorphodon (Late Triassic)body is short with reduced and fused hipbones, forth digit was elongated to support wing. |
| Which group possessed short tails? when and characteristics? | Pterodactyloids (Late Jurassic through Cretaceous). Primitive form is pterodactylus |
| Which pterosaur had a filter jaw? | Pterodaustro |
| Which pterosaur had no teeth and fed like a pelican? | Pteranodon |
Created by:
Chelseagirl2508
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