gel_lec_17 (unfinished)

gel_lec_17 (unfinished) - -Lower f-numbers mean nocturnal...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Major marine reptile groups: - Ichthyosaurs - Sauropterygians - Mosasaurs - Thalattosaurs - Sea turtles Appendicular swimming (limbs) - Plesiosaurs: similar to penguins - Rowing vs Underwater flight (more efficient) Ichthyosaurs - Started looking like lizards w/ flippers; over time of 30 mil years, got into fish shape - Started with five fingers then grew more flipper shaped - Lost fingers down to three and then started adding everywhere - Highest number: 10 fingers - Ophthalmosaurus eye as big as human face; we know this b/c has bones in eye f-number - Tells you how bright lighting system is - Our eye’s f-number is 2.1 (b/c spend more time in day)
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: -Lower f-numbers mean nocturnal or have large eyes Sauropterygians-Placodus: flat teeth; shell eaters; unlikely gave rise to turtles-Second part of sauro were different, had long necks; gave rise to plesiosaurs-Elasmosaurs: 10 m necks Mosasaurs-Came from squamates-Related to lizards and snakes-Plotosaurus: mosasaur from fresno county, CA-Globidens: globial tooth, shell eaters Thalattosaurs-Strange proportion of tail to body (really long tail)-Some shell eaters (round teeth), some fish eaters-Had claws, meaning they must have been hunting at bottom of ocean Sea Turtles-Early cretaceous...
View Full Document

This note was uploaded on 08/30/2011 for the course GEL 3 taught by Professor Motani,r during the Spring '08 term at UC Davis.

Ask a homework question - tutors are online