New terebellids (Polychaeta: Terebellidae) living in colonies of a stony coral in the state of Sao Paulo, Brazil

摘要

Two new species of Terebellidae, one of which also a new genus, were identified among the polychaetes associated with a stony coral in the state of Sao Paulo, southeastern Brazil. Morgana bisetosa, n. gen., n. sp. is an abranchiate Terebellinae with 18-25 pairs of notopodia, present from segment 4, all with two types of chaetae: bilimbate capillaries and serrated chaetae; neuro-podia from segment 6, neurochaetal uncini, arranged initially in single rows, but in double rows from the sixth torus, continuing posteriorly. Streblosoma oligobranchiatum, n. sp. (subfamily Thelepodinae) has few branchial filaments inserted almost laterally on segments 2-4; 22-26 pairs of notopodia, with no-tochaetae as bilimbate capillaries and shorter spatulate chaetae with acuminate tips. A discussion of the relationships of these new species to closely related species is given.