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Plasiacystidae
Taxonomy
Plasiacystidae was named by Prokop and Petr (2004). Its type is Plasiacystis.
It was assigned to Soluta by Prokop and Petr (2004); to Syringocrinida by Noailles et al. (2014); and to Syringocrinidae by Lefebvre and Lerosey-Aubril (2018).
It was assigned to Soluta by Prokop and Petr (2004); to Syringocrinida by Noailles et al. (2014); and to Syringocrinidae by Lefebvre and Lerosey-Aubril (2018).
Subtaxa
Plasiacystis (type genus)
Synonymy list
| Year | Name and author |
|---|---|
| 2004 | Plasiacystidae Prokop and Petr p. 152 |
| 2014 | Plasiacystidae Noailles et al. p. 460 |
| 2018 | Plasiacystidae Lefebvre and Lerosey-Aubril p. 1192 |
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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.
Fm. †Plasiacystidae Prokop and Petr 2004
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. J. Prokop and V. Petr 2004 | Solutans (?) with the skeleton distinctly composed of the large sac-like theca without rigid arms and the relatively long, flexible cylindrical proxistele composed of imbricating scale-like platelets arranged in numerous horizontal rings. Proxistele is followed with flat, elipsoidal “paddle” composed of two columns of transverse plates (dististele). |