1 / 80

Evolution of Reproduction in Lepidosaurs: A Comparative Analysis

Explore the unique reproductive strategies of lepidosaurs, focusing on viviparity, oviparity, lecithotrophy, and matrotrophy. Learn about the evolutionary path and diversity within this ancient group of diapsids.

pageb
Télécharger la présentation

Evolution of Reproduction in Lepidosaurs: A Comparative Analysis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related