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Temporal range: Early Permian, 279.5–272.5 Ma
Acheloma 12DB.jpg
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Amphibia
Order: Temnospondyli
Family: Trematopidae
Genus: Acheloma
Cope, 1882
  • A. cumminsi Cope, 1882
  • A. dunni Polley & Reisz, 2011

Trematops milleri Williston, 1909


Acheloma (also known as Trematops milleri) is an extinct genus of temnospondyl that lived during the Early Permian.[1][2] The type species is A. cumminsi. Trematops milleri has been synonymized with Acheloma. Like other trematopids, Acheloma was a large terrestrial carnivore, as shown both by its morphology and bone microanatomy.[3] One species, A. dunni, may have been the top predator of the diverse Richards Spur assemblage in Oklahoma. The following cladogram shows the phylogenetic position of Acheloma, from Polley & Reisz, 2011.[4]


Sclerocephalus haeuseri

Micromelerpeton credneri

Micropholis stowi

Eoscopus lockardi


Cacops morrisi


Phonerpeton pricei


Acheloma cumminsi

Acheloma dunni

Actiobates peabodyi

Ecolsonia cutlerensis

Anconastes vesperus

Tambachia trogallas


  1. ^ "The Paleobiology Database". Retrieved 6 January 2010. 
  2. ^ Dilkes, David William; Robert Reisz (December 30, 1987), "Trematops milleri identified as a junior synonym of Acheloma cumminsi with a revision of the genus", American Museum Novitates, American Museum of Natural History (2902) 
  3. ^ Quémeneur, S.; de Buffrénil, V.; Laurin, M. (2013). "Microanatomy of the amniote femur and inference of lifestyle in limbed vertebrates". Biological Journal of the Linnean Society. 109 (3): 644–655. doi:10.1111/bij.12066. 
  4. ^ Polley, B.P.; and Reisz, R.R. (2011). "A new Lower Permian trematopid (Temnospondyli: Dissorophoidea) from Richards Spur, Oklahoma". Zoological Journal of the Linnean Society. 161 (4): 789–815. doi:10.1111/j.1096-3642.2010.00668.x.