• Tag Archives sauropterygia
  • T-U-R-T-L-E Power! Part 2: The weird and wacky origin of turtles.

    A Galapagos tortoise struts about, secure in the knowledge that no one will ever know where the hell it came from. Photo from petcaregt.com

    This is a long overdue follow up to my original Turtle Power article back in…yeah never mind the date.

    As established previously, turtles are a strange, and highly diverse group of animals, but how did they come to be this way?

    The turtle bauplan has been a phylogenetic double edged sword. On the one hand, the unique shell design, and the necessary body contortions associated with it, make chelonians a very easy group to classify. However, it is these same peculiarities that keep us from finding the ancestor to turtles. To date, there are no “half-turtles.” No good transitionals between one reptile group to that  of turtles. As such, the list of turtle ancestors runs all over Reptilia. Some paleontologists believe the origin lies at the base with reptiles like procolophonoids, and pareiasaurs. Others believe turtles are a bit more closely related to extant reptiles, and belong in, or alongside the sauropterygians (plesiosaurs, nothosaurs, and placodonts). There is even some evidence to suggest turtles are actually in the same reptile group as dinosaurs and crocodylians (Archosauria).

    Curse that shell! - Photo by tompain

    How can the list be this extensive? Read on to find out.

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