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Free Content New Species of Oriopsis Caullery and Mesnil from Florida, Belize, and Aldabra Atoll (Seychelles), and a New Species of Amphiglena Claparède from Seychelles (Polychaeta: Sabellidae: Sabellinae)

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Abstract:

Three new species of Oriopsis Caullery and Mesnil, 1896 and a new species of Amphiglena Claparède, 1864 (Polychaeta: Sabellidae: Sabellinae) are described: Oriopsis anneae is described from the Florida Keys (U.S.A.), O. androgyne from a barrier reef island of Belize, and O. paramobilis from Aldabra Atoll (Seychelles). Oriopsis anneae is gonochoric, has three pairs of radioles, 8 thoracic chaetigers and up to 12 abdominal chaetigers. Females have a pair of spermathecae, ventrally, at the base of posterior peristomial ring collar. Males have sperm with long nuclei, split into four rods. Oriopsis androgyne is a simultaneous hermaphrodite with three pairs of radioles, 8 thoracic chaetigers and 5 abdominal chaetigers. Mature individuals have oocytes in thoracic chaetigers 5–6 and sperm and spermatids in the following 4 chaetigers. No sperm storage organs were found. Oriopsis paramobilis is gonochoric, has three pairs of radioles, 8 thoracic chaetigers and up to 5 abdominal chaetigers. Females have a pair of spermathecae in the radiolar crown. Males have sperm with long nuclei, and an elongate midpiece. All species of Oriopsis described here have lateral ducts, from sperm-bearing segments, for sperm to exit to the water. Amphiglena nathae, described from two islands of Seychelles, Indian Ocean, has up to 6 pairs of radioles, 8 thoracic chaetigers and up to 25 abdominal chaetigers. This species, like several other species of Amphiglena, is a simultaneous hermaphrodite with oocytes and developing sperm present in the first few abdominal chaetigers. Developing sperm are also present in several chaetigers posterior to oocyte-bearing segments. A pair of spermathecae were found at the base of the dorsal lips. This species broods larvae, each in an egg capsule, until they have 8 thoracic chaetigers when they hatch and swim away.

Document Type: Research Article

Publication date: January 1, 1994

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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