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Endoptygma

Gastropoda - Xenophoridae

Taxonomy
Endoptygma was named by Gabb (1877) [Sepkoski's age data: K Sn].

It was reranked as Xenophora (Endoptygma) by Squires and Saul (2001).

It was assigned to Xenophora by Squires and Saul (2001); to Neotaenioglossa by Sepkoski (2002); and to Xenophoridae by Global Biodiversity Information Facility (2015).

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

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
classGastropoda
RankNameAuthor
subclassCaenogastropoda(Cox 1959)
—Sorbeoconcha(Ponder and Lindberg 1997)
—Hypsogastropoda(Ponder and Lindberg 1997)
superorderLatrogastropodaRiedel 2000
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.

G. †Endoptygma Gabb 1877
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†Endoptygma umbilicata Tourney 1854
†Xenophora (Endoptygma) hermax Squires and Saul 2001
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.