Iotrochota birotulata (Hinggin, 1877)
Green finger sponge
Green finger sponge
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Family:  Iotrochotidae ()
Max. size:  60 cm TL (male/unsexed)
Environment:  sessile; brackish; marine; depth range 1 - 91 m
Distribution:  Indo-Pacific and Western Atlantic: Caribbean wide.
Diagnosis:  Sprawling ramose branches, with spiky surface up to 60 cm long; 1 - 5 cm wide. Black with green patches internally and externally. Oscula 0.1 - 0.3 cm in diameter, on side of branches (Ref. 415). Smaller specimens grows as lobes, runners, massive or encrusting. Surface: covered with conules; mostly or entirely smooth for small specimens. Sometimes greenish-yellow. Tough consistency; resilient and barely compressible. Exudate is dark purplish when squeezed. Oscules are scattered or in a row, slightly raised on small lobes and surrounded by a thin collar (Ref. 85482).
Biology:  Reef; mangrove; seagrass environments (Ref. 415). On hard substrates, often hosting the zoanthid Parazoanthus swiftii (Ref. 85482). Commensal with amphipods (Ref. 82302).
IUCN Red List Status: Not Evaluated (N.E.) Ref. 123251)
Threat to humans:  harmless
Country info:  Known from the mangrove ponds at Cat Cay, Manatee Cay and Fisherman's Cay, Pelican Cays (Ref. 86836, 87213) and Blue Ground Range (Ref. 86789). Inhabited by Leucothoe garifunae, Leucothoe saron (Ref. 82302), Leucothoe ashleyae and Leucothoe kensleyi (Ref. 86735). C: Ref. 82302, 83912, 86836, 87213; O: Ref. 86735, 86786, 86789.

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