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Endoptygma

Gastropoda - Xenophoridae

Synonymy list
YearName and author
1877Endoptygma Gabb
2001Xenophora (Endoptygma) Squires and Saul p. 52
2002Endoptygma Sepkoski, Jr.
2015Endoptygma Global Biodiversity Information Facility

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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
genusEndoptygmaGabb 1877

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
R. L. Squires and L. R. Saul 2001Gabb (1877) provided the name Endoptygma for Xenophora spp. possessing a strong revolving rib in the inner surface of the base of the shell. A number of species, in addition to X. umbilicata, X. plicata (Zekeli, 1852), and X. leprosa (Morton, 1834), exhibit this inner rib, but no modern Xenophora do so. The feature has been considered to be a gerontic characteristic and of no systematic importance (Stephenson, 1941; Sohl, 1960; Kollmann, 1980; Ponder, 1983). The specimens of X. hermax, n. sp., however, do not support this conclusion because they show that the rib is not restricted to a late stage of individual development.