| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Pleiadeaster
Taxonomy
Pleiadeaster was named by Webster et al. (1999). It is not extant.
It was assigned to Asteroidea by Webster et al. (1999); and to Hadrosida by Blake (2018).
It was assigned to Asteroidea by Webster et al. (1999); and to Hadrosida by Blake (2018).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1999 | Pleiadeaster Webster et al. p. 478 |
| 2018 | Pleiadeaster Blake p. 45 |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. D. Webster et al. 1999 | Ambulacrals robust, bilateral; Podial pores well-defined, funnel-shaped, medial on ossicles. One or two rows of paxillate marginals aligned with rows of transversely and longitudinally aligned discoidal dorsals; extraxial ossicles form probably uniform, ossicles comparatively small relative to body size, ossicles with a low central pustule. Disk small relative to arm length, interbrachial angle acute, arm long, evenly tapered, probably cylindrical. Ambulacrals and adambulacrals probably paired, not offset. |