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Acmarhachis
Taxonomy
Acmarhachis was named by Resser (1938) [Sepkoski's age data: ].
It was assigned to Pseudagnostidae by Westrop et al. (1996); to Agnostidae by Whittington et al. (1997), Jell and Adrain (2002); and to Agnostida by Sepkoski (2002).
It was assigned to Pseudagnostidae by Westrop et al. (1996); to Agnostidae by Whittington et al. (1997), Jell and Adrain (2002); and to Agnostida by Sepkoski (2002).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1938 | Acmarhachis Resser |
| 1940 | Cyclagnostus Lermontova |
| 1996 | Acmarhacis Westrop et al. p. 820 |
| 1997 | Acmarhachis Whittington et al. p. 349 |
| 2002 | Acmarhachis Jell and Adrain p. 337 |
| 2002 | Acmarhachis Sepkoski |
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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. †Acmarhachis Resser 1938
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†Acmarhachis acuta Kobayashi 1938
†Acmarhachis apicula Oepik 1967
†Acmarhachis hybrida Shergold 1980
†Acmarhachis karatauensis Ergaliev 1980
†Acmarhachis kindlei Westrop and Eoff 2012
†Acmarhachis longispinus Ergaliev 1980
†Acmarhachis punctatus Ergaliev 1980
†Acmarhachis typicalis Resser 1938
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Invalid names: Cyclagnostus yaogongbuensis Lu and Lin 1987 [synonym]
†Acmarhachis whittingtoni Westrop and Eoff 2012
Invalid names: Cyclagnostus Lermontova 1940 [synonym]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: g = genus, f = family, o = order | |||||
| References: Kiessling 2004, Hendy 2009 | |||||
Age range: base of the Ayusokkanian to the top of the Taoyuanian or 499.50000 to 486.85000 Ma
Collections (62 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Marjumian | USA (Utah) | A. typicalis (230681) | |
| Guzhangian | China (Zhejiang) | Cyclagnostus yaogongbuensis (125542 125686) | |
| Guzhangian | China (Hunan) | A. apicula (49187) A. typicalis (49176 49177 49190 126314 126315 126323 126330) Cyclagnostus sp., Cyclagnostus yaogongbuensis (128931) Cyclagnostus yaogongbuensis (128933) | |
| Ayusokkanian | Kazakhstan | A. apicula (118242) A. longispinus (118236) A. longispinus, A. punctatus (118191) A. typicalis (118234 118235) A. typicalis, A. karatauensis, A. longispinus, A. punctatus (118186) A. typicalis, A. longispinus (118177 118178 118179) | |
| Paibian | China (Hunan) | A. typicalis (49191 49196) | |
| Steptoean | USA (Nevada) | Pseudagnostus acutus (75270) | |
| Steptoean | Canada (Newfoundland and Labrador) | A. kindlei, A. whittingtoni (127448 127451) | |
| Dresbachian | Canada (Newfoundland and Labrador) | Acmarhacis typicalis (9696) | |
| Dresbachian | USA (Nevada) | A. typicalis (10505) | |
| Dresbachian | Canada (Yukon) | A. acuta (55217 55220 55223 55224 55225 55231 55232 55234 55277 55278 55281 55282) A. cyclopyge (55233) A. typicalis (55221 55279) | |
| Dresbachian | USA (Virginia) | A. acuta (62204 62205) | |
| Taoyuanian | South Korea | A. typicalis (133479 133480 133484 133485 133492 133516 133524 133525) | |
| Taoyuanian | Russian Federation (Sakha) | A. typicalis (133600) | |
| Iverian | Australia (Queensland) | A. hybrida (228191 228220) | |
| Aksaian | Kazakhstan | A. elegans (118382) A. elegans, A. hybrida (118386 118388) A. hybrida (118387) | |
| Stage 10 - Tremadoc | France (Montagne Noire) | Cyclagnostus sp. (20833) |