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Rhombostoma

Gastropoda - Iravadiidae

Taxonomy
Rhombostoma was named by Seguenza (1876) [Sepkoski's age data: T Mi Q Plei Sepkoski's reference number: 909].

It was assigned to Neotaenioglossa by Sepkoski (2002); and to Iravadiidae by Ponder (1984) and Lozouet (2003).

Synonyms
Synonymy list
YearName and author
1876Rhombostoma Seguenza p. 14
1881Eulimopsis Brugnone p. 120
1984Rhombostoma Ponder p. 51
2002Rhombostoma Sepkoski, Jr.
2003Rhombostoma Lozouet

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
phylumMollusca
RankNameAuthor
classGastropodaCuvier 1797
superorderHypsogastropoda(Ponder and Lindberg 1997)
infraorderLittorinimorphaGolikov and Starobogtov 1975
Discopoda(Fischer 1884)
superfamilyTruncatelloideaGray 1840
familyIravadiidaeThiele 1928
genusRhombostomaSeguenza 1876

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. Small, elongate-conic, smooth or spirally sculptured, with weaklyconvex whorls. Aperture elongately-ovate, angled and weakly channelled posteriorly; distinctly and rather deeply-channelled anteriorly; outer lip sinuate, with middle and uppermost (adapical) section advanced (see Fig. 13H). Inner lip thin, narrow; columella vertical, narrow. No external varix. Protoconch relatively small, of about two whorls, the first 12 whorls flat, the last half whorl rapidly descending. Figs. 13E-H.