Abstract
ABSTRACT Heterocoryphodon (type species = Coryphodon flerowi Chow, 1957) is a new, monotypic genus of coryphodontid pantodonts from the early-middle Eocene of China. It includes specimens previously referred to C. flerowi, C. ninchiashanensis, Manteodon flerowi, Asiocoryphodon lophodontus, and A. ninchiashanensis. Heterocoryphodon is distinguished from other coryphodontids by its size, long and shallow P2–4 ectolophs, relatively large M2, large parastyles on M1–3 and postero-linguai ridges on M1–3 lingual cingula, massive M1–3 metaconids and relatively narrow skull roof. In some features, Heterocoryphodon is morphologically intermediate between Coryphodon and Hypercoryphodon, and it is the sister taxon of the higher coryphodontids Eudinoceras and Hypercoryphodon. The distribution of H. flerowi and A. conicus in China supports broad correlation of the Yuhuangding Formation (Henan), Lingcha Formation (Henan), Shisanjiangfang Formation (Xinjiang), Ningjiashan Member of the Xinyu Formation (Jiangxi) and Guanz...
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