|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||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: minute, thin, shining, elongateconic, non-umbilicate. Aperture somewhat D-shaped, peristome simple; outer lip orthocline, sometimes flanged, with weak, narrow varix, slightly thickened internally; inner lip narrow, slightly concave. Weak but distinct spiral cords on base, remainder of shell smooth (Fig. 93F). Protoconch conical, apex pointed with about 1 Yz whorls, microsculpture of minute, shallow pits (Fig. 93G).|