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Achatella
Taxonomy
Achatella was named by Delo (1935).
It was assigned to Pterygometopidae by Jell and Adrain (2002); to Phacopida by Sepkoski (2002); and to Pterygometopinae by Jaanusson and Ramsköld (1993), Swisher et al. (2016).
It was assigned to Pterygometopidae by Jell and Adrain (2002); to Phacopida by Sepkoski (2002); and to Pterygometopinae by Jaanusson and Ramsköld (1993), Swisher et al. (2016).
Species
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1935 | Achatella Delo |
| 1993 | Achatella Jaanusson and Ramsköld |
| 1993 | Achatella (Vironiaspis) Jaanusson and Ramsköld |
| 2002 | Achatella Jell and Adrain p. 337 |
| 2002 | Achatella Sepkoski |
| 2004 | Vironiaspis Roomusoks |
| 2016 | Achatella Swisher et al. p. 62 |
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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. †Achatella Delo 1935
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Subg. †Achatella (Achatella) Delo 1935
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†Achatella (Achatella) bailyi Salter 1864
†Achatella (Achatella) consobrina Tripp 1954
†Achatella (Achatella) nieszkowskii Schmidt 1881
†Achatella katharina Bradley 1930
†Achatella kuckersianus Schmidt 1881
†Achatella schmidti Warburg 1925
†Achatella truncatocaudata Portlock 1843
Invalid names: Vironiaspis Jaanusson and Ramsköld 1993 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. E. Swisher et al. 2016 | Cephalon relatively flat with a weak anterior arch [1(1)]. L3 lobe subtriangular with conspicuous adaxial taper [7(1)], and longer (exsag.) than L1 and L2 [8(1)]. Posterior branch of facial suture nearly straight [16(1)]. Pygidium elongate, subtriangular in outline. |
Measurements
No measurements are available
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| Source: g = genus, f = family, subo = suborder, c = class | |||||
| References: Hendy 2009, Fortey and Owens 1999, Aberhan et al. 2004 | |||||
Age range: base of the Uhaku to the top of the Hirnantian or 459.70000 to 443.10000 Ma
Collections (37 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Ordovician | USA (California) | A. sp. (196137) | |
| Early/Lower Llandeilo | China (Sichuan) | A. sp. (7678) | |
| Uhaku | Russian Federation | A. kuckersiana (167734) | |
| Caradoc | United Kingdom (Scotland) | A. consobrina (188938) | |
| Caradoc | Canada (Ontario) | A. billingsi (26274) | |
| Caradoc | Ireland | A. truncatocaudata (50599 50601) | |
| Kukruse | Estonia (Ida-Viru) | A. kuckersianus (168534) | |
| Kukruse | Estonia (Kohtla-Nõmme) | A. kuckersianus (168527) | |
| Kukruse | Russian Federation | A. kuckersiana (160531) | |
| Kirkfieldian | Canada (Ontario) | A. sp., A. achates (26192) | |
| Shermanian | USA (Illinois) | Dalmanites katharina (154952) | |
| Shermanian | Canada (Ontario) | A. achates (26272) | |
| Trentonian | USA (Missouri) | Dalmanites katharina (89024) | |
| Chatfieldian | USA (New York) | A. achates (181519 181522) | |
| Chatfieldian | Canada (Ontario) | A. achates (26273 26277) | |
| Katian - Hirnantian | Sweden (Dalarne) | A. schmidti (73413) | |
| Cheneyan | United Kingdom (Scotland) | A. consobrina (169254) | |
| Edenian | Canada (Quebec) | A. achates (163865) | |
| Edenian | USA (Ohio) | A. sp. (383) | |
| Edenian | USA (Pennsylvania) | Pterygometopus achates (34895) | |
| Edenian | USA (Kentucky) | A. sp. (74813 74818) | |
| Edenian - Richmondian | Canada (Quebec) | A. clivosa (223275) | |
| Maysvillian | USA (Ohio) | A. sp. (387 388 391) | |
| Maysvillian - Ashgill | USA (Ohio) | A. sp. (389 390) | |
| Richmondian | Canada (Quebec) | A. clivosa (223276) | |
| Richmondian - Gamachian | Canada (Quebec) | A. sp. (37790) | |
| Pusgillian - Cautleyan | United Kingdom (Northern Ireland) | Phacops truncatocaudatus (171675) | |
| Ashgill | Canada (Quebec) | A. sp. (13131) | |
| Hirnantian | United Kingdom (Scotland) | A. truncatocaudata (181875 181876) |