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Helicocystitidae
Taxonomy
Helicocystitidae was named by Smith and Zamora (2013).
It was assigned to Echinodermata by Smith and Zamora (2013).
It was assigned to Echinodermata by Smith and Zamora (2013).
Subtaxa
Synonymy list
Year | Name and author |
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2013 | Helicocystitidae Smith and Zamora pp. 5 - 6 |
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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. †Helicocystitidae Smith and Zamora 2013
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Diagnosis
Reference | Diagnosis | |
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A. B. Smith and S. Zamora 2013 | Stem polyplated; basal cup of large sutured plates; theca above the cup with five recumbent ambulacra spiralling clockwise away from an apical peristome. Ambulacra composed of biserial flooring plates lacking direct connection with the body chamber, and sheets of primary cover plates and very small secondary cover plates. Interambulacral zones are also spiral, composed of sheets of plates that could be expanded and contracted concertina-like. |
Measurements
No measurements are available
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Source: p = phylum | |||||
Reference: Aberhan 1992 |