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Reproduction and development of pseudopolydora paucibranchiata polychaeta spionidae under laboratory conditions with special regard to polar lobe formation



Reproduction and development of pseudopolydora paucibranchiata polychaeta spionidae under laboratory conditions with special regard to polar lobe formation



Journal of the Faculty of Science Hokkaido University Series VI Zoology 22(2): 145-155



The reproduction and development of the spionid polychaete P. paucibranchiata were observed throughout the life cycle in the laboratory. The male produces spermatophores composed of bundles of spermatoza. The female stores the spermatozoa in seminal receptacles located on the dorsal side of the genital segment. At the oviposition, a female reproduces 7-10 egg capsules containing 35-50 eggs each. The maturation division of the egg occurs soon after the oviposition in both the fertilized and the unfertilized egg. The cleavage pattern is basically spiral, although 3 types of cleavage are distinguished by the existence of the dividing cell deformation. In all 3 types, the first 3 cleavages are accompanied by polar lobe formation. The larva with 3 setigers hatches out from the egg capsule in 3-4 days from oviposition. Metamorphosis and sexual maturation begin simultaneously about 2 wk later. Reproduction begins about 1 mo. from oviposition and oviposition is repeated weekly.

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Accession: 006315378

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