|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: small (up to about 2.6 mm in length), broadly ovate-conic, narrowly umbilicate to imperforate, with convex whorls and periphery. Sculpture of teleoconch of weak axial growth lines, and spiral microstriae or minute granules. Aperture ovate, angled but not channelled posteriorly, rounded and simple anteriorly. Outer lip thin, orthocline, with or without weak varix behind outer lip (Fig. 122A). Protoconch of about 1 %-2 Y4 whorls, initial whorl small, with weak, axial growth striae V-shaped at a weak spiral cord on last whorl. Periostracum very thin, trans parent.|