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Morphology Ecology and taphonomy   Age range and collections

Sigmocheilus

Trilobita - Asaphida - Pterocephaliidae

Taxonomy
Sigmocheilus was named by Palmer (1960) [Sepkoski's age data: Cm Dres-u Sepkoski's reference number: 489]. It is not extant.

It was assigned to Ptychopariida by Sepkoski (2002); and to Pterocephaliidae by Jell and Adrain (2003).

Synonymy list
YearName and author
1960Sigmocheilus Palmer p. 89
2002Sigmocheilus Sepkoski, Jr.
2003Sigmocheilus Jell and Adrain p. 445

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
Panarthropoda
phylumArthropodaLatreille 1829
RankNameAuthor
subphylumMandibulata
classTrilobitaWalch 1771
subclassLibristomaFortey 1990
orderAsaphidaSalter 1864
familyPterocephaliidaeKobayashi 1935
genusSigmocheilus

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
No diagnoses are available