|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Gastropoda - Rissoidae
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.
|W. F. Ponder 1984||Shell: small, elongate-conic, nonumbilicate, with strong axial ribs and spiral threads, or smooth and glossy with punctate microsculpture. Aperture D-shaped, with anterior and posterior angulations and channels; anterior channel narrow, weak to deep; posterior channel a narrow, deep notch. Outer lip opisthocline, with varix and duplicated edge. Base with prominent spiral fold (Figs 61; 140A, E; 142F). Protoconch elongately conic, about 3 Yz convex or shouldered whorls with weak spiral lirae or prominant spiral ridge (Fig. 140B, F).|