Keraterpeton, Diceratosaurus and Batrachiderpeton

Batrachiderpeton reticulatum (originally Urocordylus reticulatum; Hancock and Atthey 1869;Westphalian, Late Carboniferous 316 mya; HM G25 - 28/30). In the holotype the 1cm skull + 19 prescaral vertebrae, + 4 tail vertebrae = 5cm. The limbs are poorly preserved.

Keraterpeton galvani (originally Ceraterpeton, Wright and Huxley 1868, Etheridge 1866; Latest Carboniferous, 300mya; 30cm in overall length). Twin supratemporal horns erupted posteriorly.

Diceratosaurus punctolineatus (Cope 1874; Moodie 1909; Late Carboniferous, 300 mya; AMNH 8606) here the orbits are further anterior and the skull bones are highly sculptured. The ribs are slightly curved. The limbs are short and stout.

The origin and evolution of that "boomerang" head. Click to enlarge. Here are the taxa Beerbower (1963) associated with Diploceraspis burkei (Romer 1952), duplicated in the large reptile tree. Taxa include: Pantylus, Scincosaurus, Keraterpeton and Diplocaulus.

Diplocaulus is featured in

Beerbower JR 1963. Morphology, paleoecology, and phylogeny of the Permo-Pennsylvania amphibian Diploceraspis. Bulletin of The Museum of Comparative Zoology 130: 31-108. online paper

Cope ED 1874. Supplement to the extinct Batrachia and Reptilia of North America. I. Catalogue of the air-breathing Vertebrata from the Coal Measures of Linton, Ohio. Transactions of the American Philosophical Society. 15: 261–278.

Cope Ed 1882 Third contribution to the history of the Vertebrata of the Permian formation of Texas. Proceedings of the American Philosophical Society, Paleontological Bulletin 35:447-461.

Cruickshank ARI and Skews BW. 1980. The functional significance of nectridean tabular horns (Amphibia: Leponspondyli). Proceedings of the Royal Society B (London) 209: 513-527. online abstract

Hancock A and Atthey T. 1869. Anthracosaurus russelli. Annals and Magazine of Natural History 4(4):182-189. online paper

Moodie RL. 1909. Bulletin of the American Museum of Natural History 226:356.

Moodie RL 1916. The Coal Measures Amphibia of North America. Studies from the Dept. of Anatomy, U. of Illinois, College of Medicine 2:

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wiki/Keraterpeton
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Microsauria

Micraroter - Euryodus

Kirktonecta