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Trichasteropsida
Taxonomy
Trichasteropsida was named by Blake (1987). It is not extant. It was considered monophyletic by Blake and Hagdorn (2003).
It was assigned to Asteroidea by Sepkoski (2002); and to Forcipulatacea by Blake (1987), Blake (1989), Blake and Hagdorn (2003), Blake et al. (2006) and Blake et al. (2017).
It was assigned to Asteroidea by Sepkoski (2002); and to Forcipulatacea by Blake (1987), Blake (1989), Blake and Hagdorn (2003), Blake et al. (2006) and Blake et al. (2017).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 1987 | Trichasteropsida Blake |
| 1989 | Trichasteropsida Blake p. 213 |
| 2002 | Trichasteropsida Sepkoski |
| 2003 | Trichasteropsida Blake and Hagdorn p. 35 |
| 2006 | Trichasteropsiida Blake et al. p. 286 |
| 2017 | Trichasteropsida Blake et al. p. 324 |
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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.
Or. †Trichasteropsida Blake 1987
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Fm. †Trichasteropsiidae Blake and Hagdorn 2003
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G. †Trichasteropsis Eck 1879
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†Trichasteropsis bielertorum Blake and Hagdorn 2003
†Trichasteropsis senfti Eck 1879
†Trichasteropsis weissmanni von Münster 1843
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Invalid names: Asterias cilicia Quenstedt 1852 [synonym], Asterias obtusa Goldfuss 1833 [synonym], Trichasteropsis hippeleini Rothe 1959 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. B. Blake and H. Hagdorn 2003 | Neoasteroidea with disk relatively large, body thickened, arms gradually tapering, arched; arm tips rounded. Marginals in single series, morphologically differentiated from ossicles of adjacent ossicles. Distal marginals at least weakly enlarged in most specimens. Abactinal surface where known at least weakly reticulated, with transverse and longitudinal series enclosing areas of smaller, irregular(?) ossicles. Actinal ossicles numerous, robust, in multiple series forming a triangular field terminating along the arms but not reaching terminal. Actinal-surface spines on adambulacrals, actinals of at least some species spines uniform, robust, conical or flattened; ambulacrals, adambulacrals not otherwise differentiated. Pedicellariae unknown. |