Terrazoanthus sinnigeri is a species of uncertain validity (taxon inquirendum) of macrocnemic zoanthid first found in the Galapagos.

It is potentially a junior synonym of Terrazoanthus patagonichus.

[1] It can be distinguished by commonly occurring on rubble and rocks on sandy bottoms, having about 30–36 tentacles, and numerous nematocysts in its pharynx.

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