PaleoDB taxon number: 70397
Synonyms: Anisodexis imbricarius Cope 1882 (no. 309178), Clepsydrops gigas Cope 1878 (no. 138119), Dimetrodon gigas Cope 1878 (no. 138120), Eryops willistoni Moodie 1911 (no. 136664), Luperosaurus gigas Cope 1878 (no. 346265)
Full reference: E. D. Cope. 1877. Descriptions of extinct Vertebrata from the Permian and Triassic formations of the United States. Proceedings of the American Philosophical Society 17(100):182-193
Sister taxon: Eryops grandis
- Eryops megacephalus: AMNH 4189, a skull
- Anisodexis imbricarius: Its type locality is Coffee Creek, 34 (Arroyo Formation), which is in a Kungurian terrestrial claystone/sandstone in the Arroyo Formation of Texas.
- Clepsydrops gigas: not AMNH 4006 (collected in 1879), as erroneously stated in Case (1907), but a specimen the whereabouts of which are unknown, a set of postcrania (pelvis).
- Eryops willistoni: KU 348, a partial skeleton (skull + postcrania). Its type locality is McCann Quarry, which is in a Leonard fluvial-deltaic sandstone/sandstone in the Wellington Formation of Oklahoma.
Ecology: amphibious carnivore
Average measurements (in mm): skull length 360.0