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Achatella
Taxonomy
Achatella was named by Delo (1935).
It was assigned to Phacopida by Sepkoski (2002); to Pterygometopidae by Jell and Adrain (2002); and to Pterygometopinae by Jaanusson and Ramsköld (1993) and Swisher et al. (2016).
It was assigned to Phacopida by Sepkoski (2002); to Pterygometopidae by Jell and Adrain (2002); and to Pterygometopinae by Jaanusson and Ramsköld (1993) and 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. |