Abstract
The distribution and structural components of dorsal ciliated organs (dco) in 15 species of the Spionidae were studied by scanning- and transmission electron microscopy. Based on the distribution patterns of dco, the investigated species are divided into four non-systematic groups: (I) paired anterior dco, (II) paired dco extending posteriorly for several chaetigers, (III) paired anterior dco in combination with unpaired, sexually dimorphic, metameric dco, and (IV) paired anterior dco in combination with paired, metameric dco. Previous ultrastructural studies have only included species possessing organs of groups I and III. In the present investigation the ultrastructure of dco found in Laonice bahusiensis and Spio cf. filicornis (species with dco of groups II and IV) is studied in an attempt to consider their homology. Apart from the metameric dco of group III, similarities of the cellular components of the dco indicate a homology to nuchal organs.
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Jelsing, J. (2003). Ultrastructural studies of dorsal ciliated organs in Spionidae (Annelida: Polychaeta). In: Sigvaldadóttir, E., et al. Advances in Polychaete Research. Developments in Hydrobiology, vol 170. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0655-1_22
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DOI: https://doi.org/10.1007/978-94-017-0655-1_22
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