Abstract
The pelagic larvae of the polychaete Marenzelleria viridis (Verrill, 1873) are newcomers among the meroplankton of the Baltic Sea, where they sometimes achieve an abundance of up to 21x106 ind m-3 near the coast, especially in late autumn and even in winter. Benthos samples were collected in the Darss-Zingst bodden chain from April 1992 to 1993 and used to ascertain the reproductive stages of individuals. Development from fertilized egg to benthic juvenile is described on the basis of field material. Details of the morphology of various pelagic stages and the young benthic worm are presented as drawings and scanning electron microscope photographs. In 1992, development of the gametes started in mid-May. The individuals reached maturity in late September after about 20 wk. The first planktonic stage was the fertilized egg. The larvae have initially one and later two pairs of black eyes and, in the 2nd segment, a ciliated pit. Gastrotrochs are present on the third and thereafter every alternate segment. Neuropodial setae develop once the 7-setiger stage is reached. Palps appear at the 10-setiger stage, and neuropodial bidentate hooks from the 10th to 11th setiger on. Metamorphosis into the juvenile benthic stage takes place at the earliest when the 15-setiger stage has been reached. The reproductive seasons of various populations of M. viridis and the developmental patterns of their larvae are discussed, and differences are compared with relevant findings for the spionids.
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Communicated by O. Kinne, Oldendorf/Luhe
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Bochert, R., Bick, A. Reproduction and larval development of Marenzelleria viridis (Polychaeta: Spionidae). Marine Biology 123, 763–773 (1995). https://doi.org/10.1007/BF00349119
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DOI: https://doi.org/10.1007/BF00349119