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Trilobita - Olenida - Pterocephaliidae

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 Pterocephaliidae by Jell and Adrain (2002); to Ptychopariida by Sepkoski (2002); and to Pterocephaliinae by Hopkins (2011).

Synonymy list
YearName and author
1960Sigmocheilus Palmer p. 89
2002Sigmocheilus Jell and Adrain p. 445
2002Sigmocheilus Sepkoski
2011Sigmocheilus Hopkins p. 1144 figs. Figures 1.1, 1.2, 1.6–1.9, 12

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EubilateriaAx 1987
phylumArthropodaLatreille 1829
subphylumArtiopoda(Hou and Bergstrom)
classTrilobitaWalch 1771
familyPterocephaliidaeKobayashi 1935

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. †Sigmocheilus Palmer 1960
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Sigmocheilus compressus Palmer 1968
Sigmocheilus delicatus Lazarenko 1968
Sigmocheilus flabellifer Hall and Whitfield 1877
Invalid names: Sigmocheilus serratus Palmer 1960 [synonym]
Sigmocheilus grata Resser 1942
M. J. Hopkins 2011Amended from Palmer (1960). Pleural ridges extend postero-laterally, curve posteriorly at border furrow, extend to the posterior margin in some species.
No measurements are available
Composition: low Mg calcitec
Composition 2: chitinc
Ontogeny: molting, addition of partsc
Environment: marinec
Locomotion: fast-movingc
Life habit: low-level epifaunalc
Diet: carnivorec
Vision: well-developedf
Created: 2009-12-13 23:06:36
Modified: 2009-12-14 01:06:36
Source: f = family, c = class
References: Aberhan et al. 2004, Whittington et al. 1997

Age range: Furongian or 497.00000 to 485.40000 Ma

Collections (27 total)

Time interval Ma Country or state Original ID and collection number
Dresbachian501.0 - 485.4USA (Alaska) S. compressus (64799 64800)
Dresbachian501.0 - 485.4USA (Nevada) S. sp. (240 241)
Dresbachian501.0 - 485.4Canada (Yukon) S. flabellifer (55225)
Sakian501.0 - 485.4Russian Federation (Siberia) S. delicatus (225283)
Steptoean501.0 - 485.4USA (Nevada and Utah) S. notha (74910)
Steptoean501.0 - 485.4USA (Nevada) S. flabellifer (110624 110627 110628 110629 111327 111328 114301) S. grata (75271 75272) S. notha (110448 110449 110621 122141) S. notha, S. grata (110622) S. pogonipensis (111326 114296) S. pogonipensis, S. flabellifer (110625 110626) S. serratus (75273)
Furongian497.0 - 485.4USA (California) S. sp. (226277)