Classification
provided by World Register of Marine Species
This is an unlikely Polymastia because Verrill shows a spiraster-like microsclere in addition to tylostyles.
Verrill, A. E. (1907). The Bermuda Islands: Part V. An account of the Coral Reefs (Characteristic Life of the Bermuda Coral Reefs). Porifera: Sponges. Transactions of the Connecticut Academy of Arts and Sciences. 12: 330-344, pls 35 C-D.
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