Opiacodonthidae
Ophiacodon.gif
Reptilia dengan ilium ber lempeng dorsal untuk perototan aksial.
Bibliography
1. A Primitive Pelycosaur from the Pennsylvanian of IllinoisRobert DeMarJournal of Paleontology, Vol. 44, No. 1 (Jan., 1970), pp. 154-163 (article consists of 10 pages Published by: SEPM Society for Sedimentary Geology

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