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Phyllacanthus dubius

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description Phyllacanthus dubius Overview

Phyllacanthus dubius is a cidaroid sea urchin in the family Cidaridae, the group commonly called pencil urchins. Cidaroids retain a relatively sparse covering of small secondary spines and carry prominent primary spines, giving the test a different appearance from the densely spined regular urchins familiar on many reefs. The species is of interest to specialists identifying Indo-Pacific cidaroids and comparing echinoid form and classification.

help Phyllacanthus dubius FAQ

What kind of sea urchin is Phyllacanthus dubius?

Phyllacanthus dubius is a cidaroid sea urchin in the order Cidaroida. Cidaroids are often recognized by their large primary spines and by the relatively exposed surface of the test between those spines.

Why are the primary spines of Phyllacanthus dubius important for identification?

Its primary spines can vary from flattened and serrated forms to more cylindrical, tapering shafts with longitudinal granulation. That variation is one reason older echinoid descriptions sometimes separated forms that are now treated as the same species.

Where does Phyllacanthus dubius live?

Records place Phyllacanthus dubius in Indo-Pacific marine environments, including shallow and shelf habitats depending on the population. It is a bottom-dwelling echinoid rather than a reef fish or free-swimming animal.

Can other organisms live on Phyllacanthus dubius spines?

Yes, marine records describe organisms such as bryozoans and Spirorbis polychaetes attached to its spines. Those epibionts can add useful context when marine biologists examine preserved specimens or photographs.

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