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Xysila
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).
It was assigned to Protozyginae by Copper (1995); to Protozygidae by Williams et al. (2002); and to Atrypida by Sepkoski (2002).
Species
Synonymy list
Year | Name and author |
---|---|
1995 | Xysila Copper pp. 848 - 849 |
2002 | Xysila Sepkoski |
2002 | Xysila Williams et al. p. 1472 |
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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. †Xysila Copper 1995
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†Xysila anticostiana Twenhofel 1914
†Xysila astaca Copper 1995
†Xysila mogoktaensis Nikiforova 1961
Diagnosis
Reference | Diagnosis | |
---|---|---|
P. Copper 1995 | Elongate, 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. |