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|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Gastropoda - Cerithimorpha - Orthonemidae
It was Stegocoelia (Hypergonia) by Knight et al. (1960); it was reranked as Hypergonia by Longstaff (1926), Bandel (2002), Sepkoski (2002) and Wagner (2017).
It was assigned to Murchisonia by Donald (1892); to Murchisoniidae by Longstaff (1926); to Stegocoelia by Knight et al. (1960); to Archaeogastropoda by Sepkoski (2002); and to Orthonemidae by Bandel (2002) and Wagner (2017).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|J. D. Longstaff 1926||Shell of small or medium size. turriculated, and greatly elongated. Whorls numerous, increasing slowly, slightly convex. Ornamentation consisting of foul' threads, the three lower stronger than the uppermost, and nearly equidistant. The sinus is situated between the upper of these three and the finer thread above. Base convex. Aperture subovoid. Columellar lip slightly curved.|