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Morphology Ecology and taphonomy   Age range and collections

Rissoina (Apataxia)

Gastropoda - Rissoidae

Synonymy list
YearName and author
1956Apataxia Laseron p. 401
1984Rissoina (Apataxia) Ponder p. 84
2002Apataxia Sepkoski, Jr.

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
phylumMollusca
classGastropodaCuvier 1797
RankNameAuthor
superorderHypsogastropoda(Ponder and Lindberg 1997)
infraorderLittorinimorphaGolikov and Starobogtov 1975
Discopoda(Fischer 1884)
superfamilyRissooideaGray 1847
familyRissoidaeGray 1847
genusRissoinad'Orbigny 1840
subgenusApataxia(Laseron 1956)

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.

Diagnosis
ReferenceDiagnosis
W. F. Ponder 1984Shell: 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.