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Achistrum multiperforatum
Taxonomy
Achistrum (Porachistrum) multiperforatum was named by Beckmann (1965). It is considered to be a form taxon.
It was recombined as Achistrum multiperforatum by Boczarowski (2001), Bohaty and Herbig (2010).
It was recombined as Achistrum multiperforatum by Boczarowski (2001), Bohaty and Herbig (2010).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1965 | Achistrum (Porachistrum) multiperforatum Beckmann pp. 204-205 figs. Pl. 1: 6–8; text-figs 8-10 |
| 2001 | Achistrum multiperforatum Boczarowski pp. 156-158 figs. Pl. 19: 4-18; Text-figs 73A-Z, 74A-F, I, J |
| 2010 | Achistrum multiperforatum Bohaty and Herbig p. 380 figs. Figs 6B, (?) 7L–M |
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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.
†Achistrum multiperforatum Beckmann 1965
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Boczarowski 2001 | Radial elements of the calcareous ring with a large, but not protruding, concavity for muscle insertion. On the inner edge of the distal part of the radials there are four distinct knobs, each pair separated by a concavity, giving the margin a wavy appearance. Sclerites are hooks with a perforated eye, its network is droplet−like in outline. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum | |||||
| References: Aberhan et al. 2004, Arkadiev and Bugrova 1999, Aberhan 1992 | |||||
Age range: base of the Emsian to the top of the Middle Frasnian or 410.62000 to 375.20000 Ma
Collections (7 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Emsian | Poland (Kielecki) | Achistrum multiperforatum (94468 94469) | |
| Givetian | Germany (Nordrhein-Westfalen) | Achistrum multiperforatum (101679) | |
| Late/Upper Givetian | Poland | Achistrum multiperforatum (82667 83086 99464) | |
| Middle Frasnian | Poland (Swietokrzyskie Voivodship) | Achistrum multiperforatum (99450) |