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Janiceps
Taxonomy
Janiceps was named by Frech (1901) [Sepkoski's age data: P Djhu P Dora Sepkoski's reference number: 411,1239]. Its type is Spirigera peracuta. It is the type genus of Janicepsinae.
It was assigned to Spiriferida by Sepkoski (2002); to Spirigerellinae by Williams et al. (2002); and to Janicepsinae by Posenato (2001), Williams et al. (2007).
It was assigned to Spiriferida by Sepkoski (2002); to Spirigerellinae by Williams et al. (2002); and to Janicepsinae by Posenato (2001), Williams et al. (2007).
Species
J. bipartita, J. cadorica (syn. Spirigera confinalis, Spirigera archimedis, Athyris globulus, Athyris irregularis, Athyris sagitta, Spirigera pusilla, Athyris humeralis), J. emarginatiformis, J. lozovskyi, J. ogbinensis, J. papilio (syn. Spirigera aquilina), J. peracuta (syn. Spirigera janiceps, Spirifer sextensis)
Synonymy list
| Year | Name and author |
|---|---|
| 1901 | Janiceps Frech p. 551 |
| 2001 | Janiceps Posenato p. 205 |
| 2002 | Janiceps Sepkoski |
| 2002 | Janiceps Williams et al. p. 1540 |
| 2007 | Janiceps Williams et al. p. 2757 |
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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. †Janiceps Frech 1901
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†Janiceps bipartita Stache 1878
†Janiceps cadorica Stache 1878
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Invalid names: Athyris globulus Merla 1930 [synonym], Athyris humeralis Merla 1930 [synonym], Athyris irregularis Merla 1930 [synonym], Athyris sagitta Merla 1930 [synonym], Spirigera archimedis Stache 1878 [synonym], Spirigera confinalis Stache 1878 [synonym], Spirigera pusilla Stache 1878 [synonym]
†Janiceps emarginatiformis Grunt 1986
†Janiceps lozovskyi Grunt 1986
†Janiceps ogbinensis Grunt 1965
†Janiceps peracuta Stache 1878
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Invalid names: Spirifer sextensis Stache 1878 [synonym], Spirigera janiceps Stache 1878 [synonym]
Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 21 | 11.7 | 3.20 | 20.6 | 13.2 | 4.71 | |
| valve height | 32 | 7.31 | 3.50 | 14.5 | 7.70 | 2.66 |
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| Source: subo = suborder, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Nesnidal et al. 2013 | |||||
Age range: base of the Wuchiapingian to the top of the Changhsingian or 259.51000 to 251.90200 Ma
Collections (23 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Wuchiapingian | Armenia | Araxathyris emarginata (116774) Araxathyris ogbinensis, Araxathyris emarginata (109486) | |
| Wuchiapingian | Iran | Araxathyris ogbinensis (118279) J. sp. (125581) | |
| Wuchiapingian | Azerbaijan | J. sp. (110701) | |
| Changhsingian | Italy | J. papilio (116437) J. peracuta (88653) J. peracuta, J. cadorica (101908) J. peracuta, J. cadorica, J. papilio (101933) J. peracuta, J. cadorica, J. papilio, J. bipartita (101912 116439) J. sp. (74937 74938 87191 101934 101935 116441) Spirigera bipartita (232369) | |
| Changhsingian | Azerbaijan | J. janiceps (110692 116756) J. lozovskyi (81395) | |
| Changhsingian | Armenia | Araxathyris ogbinensis (113726 116773) |