Gastropoda - Cerithimorpha - Orthonemidae

Alternative combination: Stegocoelia (Hypergonia) elongata

Full reference: E. K. Yoo. 1988. Early Carboniferous Mollusca from Gundy, Upper Hunter, New South Wales. Records of the Australian Museum 40(3):233-264

Belongs to Hypergonia according to P. J. Wagner 2011

Sister taxa: Hypergonia agraciada, Hypergonia attenuata, Hypergonia baldwinensis, Hypergonia hoffmani, Hypergonia illinoiensis, Hypergonia kirkbyi, Hypergonia marvinwelleri, Hypergonia percarinata, Hypergonia percostata, Hypergonia prolixa, Hypergonia quadricarinata, Hypergonia tatei, Hypergonia tenuis, Hypergonia turritella, Hypergonia vermicula, Stegocoelia (Hypergonia) acuminata, Stegocoelia (Hypergonia) cincta, Stegocoelia (Hypergonia) jonathanensis, Stegocoelia (Hypergonia) korobkovi

Type specimen: F.61970, a shell. Its type locality is Marohn Homestead. Yoo Loc. A4. 70 m west of Scone-Gundy road junction, which is in a Tournaisian marine mudstone in the Dangarfield Formation of Australia.

Ecology: epifaunal