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Sigmocheilus
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 Pterocephaliidae by Jell and Adrain (2002); to Ptychopariida by Sepkoski (2002); and to Pterocephaliinae by Hopkins (2011).
It was assigned to Pterocephaliidae by Jell and Adrain (2002); to Ptychopariida by Sepkoski (2002); and to Pterocephaliinae by Hopkins (2011).
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1960 | Sigmocheilus Palmer p. 89 |
| 2002 | Sigmocheilus Jell and Adrain p. 445 |
| 2002 | Sigmocheilus Sepkoski |
| 2011 | Sigmocheilus Hopkins p. 1144 figs. Figures 1.1, 1.2, 1.6–1.9, 12 |
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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. †Sigmocheilus Palmer 1960
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†Sigmocheilus compressus Palmer 1968
†Sigmocheilus delicatus Lazarenko 1968
†Sigmocheilus flabellifer Hall and Whitfield 1877
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Invalid names: Sigmocheilus serratus Palmer 1960 [synonym]
†Sigmocheilus grata Resser 1942
†Sigmocheilus pogonipensis Resser 1942
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. J. Hopkins 2011 | Amended from Palmer (1960). Pleural ridges extend postero-laterally, curve posteriorly at border furrow, extend to the posterior margin in some species. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Whittington et al. 1997, Aberhan et al. 2004 | |||||
Age range: Steptoean or 497.00000 to 493.50000 Ma
Collections (27 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Steptoean | USA (Nevada and Utah) | S. notha (74910) | |
| Steptoean | USA (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) | |
| Sakian | Russian Federation (Siberia) | S. delicatus (225283) | |
| Dresbachian | USA (Nevada) | S. sp. (240 241) | |
| Dresbachian | USA (Alaska) | S. compressus (64799 64800) | |
| Dresbachian | Canada (Yukon) | S. flabellifer (55225) | |
| Furongian | USA (California) | S. sp. (226277) |