Mammalia - Allotheria - Eucosmodontidae

Alternative combination: Parectypodus jepseni

Synonym: Eucosmodon sparsus Simpson 1937

Full reference: G. G. Simpson. 1935. Proceedings of the United States National Museum 83

Belongs to Stygimys according to D. L. Lofgren et al. 2005

Sister taxa: Stygimys camptorhiza, Stygimys gratus, Stygimys kuszmauli, Stygimys teilhardi, Stygimys vastus

Type specimens:

• Stygimys jepseni: Its type locality is Gidley Quarry, which is in a Torrejonian terrestrial horizon in the Fort Union Formation of Montana
• Eucosmodon sparsus: Its type locality is Upper Lebo Loc. 25, which is in a Torrejonian terrestrial horizon in the "Fort Union" (= Lebo) Formation of Montana.

Average measurements (in mm): m1 3.10 x 1.40