|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: ovate-conic, non-umbilicate, with strong to sub-obsolete spiral sculpture, often with spiral keels. Aperture with simple peristome, angled but not channelled posteriorly, rounded anteriorly, with prosocline or orthocline outer lip; with or without a varix (Figs 106C, D, F; 107A, C, E, G; lOSA). Protoconch sculptured with smooth spiral lirae and close, irregular, axial, lamellate threads between, or zigzag, spiral lirae (Figs 106E, G; 107B, D, F; lOSB).|