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Lepidosaurs

Lepidosaurs. Lepidosaurs. Diapsids Unifying synapomorphies: scales copulatory organs… cloacal opening… Two main groups…. “Lacertilia”. Lepidosaurs. Lepidosaurs. Lepidosaurs. Lepidosaurs. Lepidosaurs. The Galapagos marine iguana, Amblyrhynchus cristatus. Ophidia. Lepidosaurs.

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Lepidosaurs

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  1. Lepidosaurs

  2. Lepidosaurs • Diapsids • Unifying synapomorphies: • scales • copulatory organs… • cloacal opening… • Two main groups…

  3. “Lacertilia” Lepidosaurs

  4. Lepidosaurs

  5. Lepidosaurs

  6. Lepidosaurs

  7. Lepidosaurs The Galapagos marine iguana, Amblyrhynchus cristatus

  8. Ophidia

  9. Lepidosaurs • Reproduction in vertebrates: • gonochoristic • parthenogenetic • spawning • copulation • oviparity • viviparity

  10. Lepidosaurs • lecithotrophy…

  11. Lepidosaurs • matrotrophy…

  12. lecithotrophy matrotrophy Lepidosaurs oviparity viviparity

  13. Lepidosaurs oviparity viviparity O + L lecithotrophy matrotrophy

  14. Lepidosaurs oviparity viviparity lecithotrophy V + M matrotrophy

  15. Lepidosaurs oviparity viviparity lecithotrophy matrotrophy O + M

  16. Lepidosaurs oviparity viviparity lecithotrophy V + L: “ovoviviparity” matrotrophy

  17. Lepidosaurs oviparity viviparity O + L: many fishes most amphibians turtles, crocs, many squamates lecithotrophy V + L: “ovoviviparity” V + M: eutherian mammals some fishes some squamates O + M: monotremes matrotrophy

  18. Lepidosaurs oviparity viviparity O + L: many fishes most amphibians turtles, crocs, most squamates lecithotrophy V + L: “ovoviviparity” minimal or incipient matrotrophy V + IM: many squamates some fishes O + IM: birds V + M: eutherian mammals some fishes some squamates O + M: monotremes extreme matrotrophy

  19. Lepidosaurs oviparity viviparity O + L: many fishes most amphibians turtles, crocs, most squamates lecithotrophy V + L: “ovoviviparity” minimal or incipient matrotrophy V + IM: many squamates some fishes O + IM: birds V + M: eutherian mammals some fishes some squamates O + M: monotremes extreme matrotrophy

  20. Lepidosaurs • evolution of viviparity: V EM chondrichthyes 15 5 osteichthyes 13 12 amphibia 5 3 squamates 98 3 other reptiles 0 0 birds 0 0 mammals 1 1 total 132 24

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