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Onustus

Gastropoda - Xenophoridae

Taxonomy
Xenophora (Onustus) was named by Swainson (1840) [m. kosnik taxon no: 7855].

It was Stellaria (Onustus) by Okutaini (2000); it was reranked as Onustus by Todd (2001) and Bouchet (2015).

It was assigned to Xenophora by Ponder (1983) and Wilson (1993); to Stellaria by Okutaini (2000); and to Xenophoridae by Todd (2001) and Bouchet (2015).

Synonyms
Synonymy list
YearName and author
1840Xenophora (Onustus) Swainson
1880Tugurium Fischer p. 450
1896Tugurium (Trochotugurium) Sacco
1897Xenophora (Tugurium) Harris
1960Tugurium MacNeil p. 47
1972Tugurium Ladd p. 55
1977Tugurium (Trochotugurium) Beu p. 234
1977Tugurium Ladd p. 17
1983Xenophora (Onustus) Ponder pp. 58 - 59
1993Xenophora (Onustus) Wilson p. 169
2000Stellaria (Onustus) Okutaini p. 203
2001Onustus Todd
2002Trochotugurium Sepkoski, Jr.
2002Tugurium Sepkoski, Jr.
2015Onustus Bouchet

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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
superfamilyXenophoroideaTroschel 1852
familyXenophoridaeTroschel 1852
genusOnustus(Swainson 1840)

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 1983Shell thin, with wide peripheral flange simple or weakly digitate, porcellanous below. Umbilicus narrow to wide, sometimes plugged with callus. Foreign objects attached to periphery on few to all whorls, small and inconspicuous, leaving most of shell surface exposed. Foot lacks sole on metapodium, mantle edge smooth, ctenidial filaments very long. Operculum radially ridged externally or almost smooth, bearing only very fine radial striae.