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Rozanovicystidae
Taxonomy
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 2006 | Rozanovicystidae Rozhnov p. 271 |
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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. †Rozanovicystidae Rozhnov 2006
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. V. Rozhnov 2006 | Theca triangular in outline with eight marginal plates, strongly convex carinate central part of lower side composed of numerous hexagonal central plates. Ambulacra long, encircling entire or significant part of wide theca collar.
The new family differs from the three other families in clear triangular shape of the theca, convex carinate central part of the lower surface, in short or missing stele, a wide collar around the entire theca and ambulacra stretching along the collar and covering nearly the whole lateral part of the theca. |
Measurements
No measurements are available
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| Source: o = order, p = phylum | |||||
| References: Aberhan 1992, Raman et al. 2015 | |||||
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Amgan - Mayan | Russian Federation (Sakha) | Rozanovicystis triangularis (198908) |