| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Polyplacida (disused)
Taxonomy
Polyplacida was named by Durham (1967).
It was assigned to Helicoplacoidea by Durham (1967) and Durham (1993).
It was assigned to Helicoplacoidea by Durham (1967) and Durham (1993).
Is something missing? Join the Paleobiology Database and enter the data
|
|
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.
Subcl. †Polyplacida Durham 1967
show all | hide all
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. W. Durham 1967 | Helically organized echinoderms, with test built of a mosaic of small plates organized into expansible pleats; pleats extending helically from oral to apical poles, presumably functioning as interambulacra; ambulacra unknown as yet. |