Halosydna

annelid genus

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In annelid: Annotated classification
…of genera: Aphrodita (sea mouse), Halosydna (common scale worm), Arctonoe. Order Amphinomida Free-moving; prostomium with 1 to 5 antennae, 2 palpi, and a caruncle (posterior ridge) deeply set into anterior segments; parapodia with 2 lobes and branchiae (gills); size, 0.5 to 35 cm; examples of genera: Eurythoe (fireworm),
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