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Xerxespirifer

Rhynchonellata - Athyridida - Retziellidae

Taxonomy
Xerxespirifer was named by Cocks (1979) [Sepkoski's age data: S Wenl Sepkoski's reference number: 538].

It was assigned to Acrospiriferinae by Cocks (1979); to Retziellidae by Williams et al. (2002); and to Spiriferida by Sepkoski (2002).

Synonymy list
YearName and author
1979Xerxespirifer Cocks p. 40
2002Xerxespirifer Sepkoski, Jr.
2002Xerxespirifer Williams et al. p. 1583

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Life
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
RankNameAuthor
phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderAthyrididaBoucot et al. 1964
suborderAthyrididinaBoucot et al. 1964
superfamilyRetzielloideaRzhonsnitskaya 1974
familyRetziellidaeRzhonsnitskaya 1974
genusXerxespirifer

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
L. R. M. Cocks 1979Delthyrid like Howellella but with pinched-in pedicle muscle field, and with a median rib in the sulcus of the pedicle valve and a corresponding hollow in the brachial valve fold.