Lecture_23 Marine reptiles

Lecture_23 Marine reptiles - Lecture 23: Marine reptiles...

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Lecture 23: Marine reptiles November 24, 2008 1) How many lineages of marine reptiles were there? a) Major Marine Reptile Groups i) Sauropterygians: biggest group of marine reptiles (1) Plesiosaurs: the biggest group (2) Placodonts ii) Itchthyosaur iii) Mosasaurs iv) Thalattosuchians v) Sea turtles: most successful but never big in diversity vi) Thalattosaurs vii)Pleurosaurs viii) OVERALL, MORE THAN A DOZEN IN TOTAL b) Hupehsuchus (Middle Triassic) don’t know what it is i) Reptile due to hand ii) But looks like fish iii) At some point in time, it was easy for reptiles for become marine and inviade the ocean c) Sauropyerygia i) Two lineages (1) Placodontia (a) Placodontoidea (i) head was filled with huge teeth (ii) Clearly shell eater (b) Cyamodontoidea (i) Had shell and carapace (ii) Head is similar to placodontoidea, huge teeth (iii) Shell eater (iv)Some became almost terrestrial 1. Losing teeth (2) Eosauropterygia (a) Nothosauria (i) Pachypleurosuroidea: 1. Long necked 2. Small 3. Weird shoulders: shoulders turned into ring
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This note was uploaded on 03/15/2010 for the course GEL GEL 107 taught by Professor Jishin during the Winter '09 term at UC Davis.

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Lecture_23 Marine reptiles - Lecture 23: Marine reptiles...

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