|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: of small size, narrower than most Rissoina species. Sculpture of axial ribs crossed by weaker spiral cords. Aperture small, with a few weak ridges inside outer lip (Fig. 55). Protoconch typically conical, sculptured with raised chevron-shaped markings and granules in spiral series; apical whorl smooth; last whorl weakly keeled (Fig. 1320). Some species with apparently smooth, dome-shaped protoconch.|