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Xenambonites

Strophomenata - Strophomenida - Sowerbyellidae

Taxonomy
Xenambonites was named by Cooper (1956) [Sepkoski's age data: O Llde O Cara-l Sepkoski's reference number: 878]. It is the type genus of Xenambonitinae, Xenambonitidae.

It was assigned to Strophomenida by Sepkoski (2002); and to Xenambonitinae by Cooper (1956), Williams et al. (2000) and Benedetto (2012).

Synonymy list
YearName and author
1956Xenambonites Cooper p. 230
2000Xenambonites Williams et al. p. 334
2002Xenambonites Sepkoski, Jr.
2012Xenambonites Benedetto p. 439

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyPlectambonitoideaJones 1928
familySowerbyellidaeOpik 1930
subfamilyXenambonitinae
genusXenambonites

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
G. A. Cooper 1956Shell small, semielliptical in outline ; hinge wide, cardinal extremities acute; plano- to concavo-convex; anterior commissure deeply sulcate; surface finely costellate.

Shell small, semielliptical in outline ; hinge wide, cardinal extremities acute; piano- to concavo-convex; anterior commissure deeply sulcate; surface finely costellate.

Pedicle valve with moderately long interarea ; anterior with prominent, broad median fold; teeth small, simple; muscle area wide but short, somewhat rectangular in outline; dental plates vestigial; trough corresponding to fold anterior to muscle area may or may not be occupied by an inverted V-shaped cavity; ovarian impressions fairly large, bounded on the side nearest the median line by a lowridge. Delthyrium open in the adult.

Brachial valve deeply sulcate, the sulcus on the inside forming a high, rounded ridge which serves as a median septum ; sockets narrow, slitlike ; brachiophores thin, short, flat blades intimately fused with a convex plate that arches over the notothyrium ; a septumlike cardinal process and intergrown brachiophores forming an arched plate suggest the tentlike structure of Soiverhyella; visceral disk short, strongly elevated toward the pedicle valve, somewhat expanded laterally and produced into a long point anteromedially.