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avatar_Halichoeres

The weird hind fin of Rhizodus

Started by Halichoeres, November 30, 2018, 10:05:33 PM

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Halichoeres

November 30, 2018, 10:05:33 PM
Rhizodus hibberti, a gigantic predatory fish of the Carboniferous, is a stem-tetrapod (closer to tetrapods than to lungfishes, phylogenetically). Modern tetrapods and most fossil ones have hind limbs that start from the hip with one bone (the femur), which articulates at its end with two bones (the tibia and fibula). Showing that there was a lot of variation and experimentation in the early tetrapodomorphs, Rhizodus has a femur that articulates with three bones instead.


The top row is the forelimbs/forefins, and the bottom row is the hindlimbs. The zeugopod (middle section of the limb), consists of three bones, instead of two like basically all other tetrapodomorphs.

Paper (open access): http://www.pnas.org/content/115/47/12005
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