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Ultrastructure and development of the nephridia in Anaitides mucosa (Annelida, Polychaeta)

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Summary

Different developmental stages (trochophores, nectochaetae, non-mature and mature adults) of Anaitides mucosa were investigated ultrastructurally. A. mucosa has protonephridia throughout its life; during maturity a ciliated funnel is attached to these organs. The protonephridial duct cells are multiciliated, while the terminal cells are monociliated. The single cilium is surrounded by 14 microvilli which extend into the duct lumen without coming into any contact with the duct cells. Corresponding ultrastructure and development indicate that larval and adult protonephridia are identical in A. mucosa. Differences between various developmental stages can be observed only in the number of cells per protonephridium. A comparison between the funnel cells, the cells of the coelothel and the duct cells reveals that the ciliated funnel is a derivative of the duct. Due to the identical nature of the larval and postlarval protonephridia, such a funnel cannot be a secondary structure. In comparison with the mesodermally derived metanephridial funnel in phoronids it seems likely that the metanephridia of annelids and phoronids evolved convergently.

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  1. II. Zoologisches Institut und Museum, Berliner Strasse 28, D-3400, Göttingen, Federal Republic of Germany

    Thomas Bartolomaeus

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Bartolomaeus, T. Ultrastructure and development of the nephridia in Anaitides mucosa (Annelida, Polychaeta). Zoomorphology 109, 15–32 (1989). https://doi.org/10.1007/BF00312180

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