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Green finger sponge
Iotrochota birotulata
(Higgin, 1977)

Sprawling or upright, thick, ramose branches with a conulose surface; small incrusting specimens often wholly or partly smooth. Length of the branches up to 50 cm, diameter 1-5 cm. Incrusting specimens may only be a few mm in thickness. Consistency tough, incompressible.

Black, mottled with longitudinal green patches; occasionally entirely greenish-yellow. Gives off a dark purplish exudates when squeezed.

Known from reefs, undersides of stones in shallow bays and from deeper water beyond the reefs. Frequently covered with winding chains of Golden zoanthids (Parazoanthus swiftii ).

Common South Florida, Caribbean to Venezuela.

Green finger sponge (Iotrochota birotulata)