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Protaxocrinus
Taxonomy
Protaxocrinus was named by Springer (1906) [Sepkoski's age data: O Cara-m D Gedi]. It is not extant. Its type is Taxocrinus ovalis.
It was assigned to Taxocrinidae by Ausich (1998) and Ausich and Copper (2010); and to Taxocrinida by Sepkoski (2002) and Wright et al. (2019).
It was assigned to Taxocrinidae by Ausich (1998) and Ausich and Copper (2010); and to Taxocrinida by Sepkoski (2002) and Wright et al. (2019).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1906 | Protaxocrinus Springer |
| 1998 | Protaxocrinus Ausich p. 23 |
| 2002 | Protaxocrinus Sepkoski |
| 2010 | Protaxocrinus Ausich and Copper p. 54 |
| 2019 | Protaxocrinus Wright et al. |
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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. †Protaxocrinus Springer 1906
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†Protaxocrinus elegans Billings 1857
†Protaxocrinus laevis Billings 1857
†Protaxocrinus paraios Ausich and Copper 2010
†Protaxocrinus sideros Ausich and Copper 2010
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. F. Wright et al. 2019 | Taxocrinid with an elongated crown. Infrabasals 3; CD basal enlarged, elongated; interradial plates present, small, positioned between proximal primibrachials. Radianal positioned directly under C ray radial; anal X resting on the upper right shoulder of CD basal; anal sac tube-like,
comprised of a series of vertically stacked plates, in close affinity with proximal brachials in the C ray. Primibrachials 2; arms branch isotomously several times. Column circular, somewhat wider near the base of the calyx. |