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Lecture 17 Wrld Dnsr

On Land, Sea, and Air: Other Mesozoic Vertebrates

QuestionAnswer
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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