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Xysila

Rhynchonellata - Atrypida - Protozygidae

Taxonomy
Xysila was named by Copper (1995) [Sepkoski's age data: O Ashg-m S Ldov-m Sepkoski's reference number: 1179]. It is not extant. Its type is Xysila astaca.

It was assigned to Protozyginae by Copper (1995); to Protozygidae by Williams et al. (2002); and to Atrypida by Sepkoski (2002).

Synonymy list
YearName and author
1995Xysila Copper pp. 848 - 849
2002Xysila Sepkoski, Jr.
2002Xysila Williams et al. p. 1472

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderAtrypidaRzhonsnitskaya 1960
suborderLissatrypidinaCopper 1996
superfamilyProtozygoideaCopper 1986
familyProtozygidaeCopper 1986
genusXysila

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
P. Copper 1995Elongate, ventribiconvex to biconvex, smooth, generally small, globose shell, rectimarginate to weakly sulcate; internally with medially directed spiralia of three or more whorls; simple U-shaped jugum located towards centrodorsal side of shell.