|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Gastropoda - Euomphalina - Euomphalidae
It was assigned to Gastropoda by La Rocque (1949); to Ophiletidae by Morris and Cleevely (1981); to Euomphalidae by Knight et al. (1960) and Linsley and Kier (1984); to Euomphalina by Sepkoski (2002); and to Odontomariinae by Frýda et al. (2006).
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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.
|A. La Rocque 1949||Shell large, 96 mm. or more long, tusk-shaped, uncoiled, gently and irregularly curved, triangular in cross section, with three more or less developed, unequally spaced, winglike processes, two of them basal, the other apical, the latter less pronounced than the former; interior circular in cross section. Shell thick, especially at the bases of the processes. Aperture flaring at the two basal angles, much less so at the apical one. Sculpture of fine growth lines curving backward along the base and forward from the apical angle. Nuclear whorls not preserved. Apical part terminating abruptly in a convex surface which suggests that the earliest part of the shell had been broken off at a point marked by a septum or plug.|