Abstract
At date, seven species of Stylopoma Levinsen, 1909 are reported from the Brazilian coast, five of which are known from Bahia State in the northeastern region. Here we describe four new species of Stylopoma, all from Bahia State: Stylopoma corallinum n. sp., Stylopoma faceluciae n. sp., Stylopoma multiavicularia n. sp. and Stylopoma sinuata n. sp. Unlike the Caribbean species of Stylopoma, that mainly have rounded primary orifice and slit-like sinus, the morphology of the primary orifice of Brazilian taxa, including the new species presented here, is quite variable. In the newly described taxa, the sinus is drop-shaped in S. corallinum n. sp. and S. faceluciae n. sp., U-shaped in S. multiavicularia n. sp. and V-shaped in S. sinuata n. sp. Like congeners from the Caribe, S. corallinum n. sp., S. faceluciae n. sp. and S. multiavicularia n. sp. have avicularia on the surface of the ooecia. Remarks on the morphological characters currently used in Stylopoma taxonomy are provided, including a comparative table of all living species worldwide.
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