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Polygonograptus
Taxonomy
Polygonograptus was named by Boucek (1957) [Sepkoski's age data: Cm Dres-u S Ludl Sepkoski's reference number: 931].
It was assigned to Dendrograptidae by Rickards et al. (1990); and to Dendroidea by Sepkoski (2002).
It was assigned to Dendrograptidae by Rickards et al. (1990); and to Dendroidea by Sepkoski (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1957 | Polygonograptus Boucek |
| 1990 | Polygonograptus Rickards et al. p. 227 |
| 2002 | Polygonograptus 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. †Polygonograptus Boucek 1957
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†Polygonograptus mellaensis Rickards et al. 1990
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. B. Rickards et al. 1990 | Probably very low conical rhabdosome, mostly comprising stipes fully anastomosed in such a fashion that they define pentagonal or hexagonal, sometimes sub-circular meshes; attached by disc in one species where earliest stipes are less regularly meshed and with some dissepiments; autothecae probably have denticulate apertures; bithecae smaller, inconspicuous tubes; single line of stolonal development in each stipe. |