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Ultrastructure of presumptive light sensitive ciliary organs in larvae of Poecilochaetidae, Trochochaetidae, Spionidae, Magelonidae (Annelida) and its phylogenetic significance

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Abstract

Larvae of Poecilochaetus serpens, Trochochaeta multisetosum and Polydora ciliata possess almost identical unpigmented, ciliary, presumptive light sensitive organs within the prostomium. The data corroborate hypotheses on the close relationship of Poecilochaetidae, Trochochaetidae and Spionidae and are even congruent with inclusion of Poecilochaetidae and Trochochaetidae within Spionidae. The organs in P. serpens, T. multisetosum and P. ciliata are composed of one monociliary receptor cell, one supportive cell and several associated flask shaped bipolar sensory cells. The receptor cell cilium enters the supportive cell cavity through a thin pore, dilates and then branches into a high number of disordered projections. The associated sensory cells bear one or occasionally two cilia, which run horizontally beneath or within the cuticle. The supportive cell cavity is not sealed by any cell contact from the subcuticular extracellular space. The organs in Magelona mirabilis are composed of a single supportive cell, but several receptor cells. No further sensory cells are associated. Each receptor cell sends one cilium into an own invagination of the supportive cell, and the ciliary branches are highly ordered. The examined organs in P. serpens, T. multisetosum and P. ciliata exhibit a unique organization amongst polychaetes. The organs of M. mirabilis are most probably homologous. A homology to ciliary organs of Protodrilida is conceivable. In the lineage leading to Protodrilida, primary larval organs may have been integrated into the adult body organization by heterochrony.

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  1. Biology Institute, Animal Systematics and Evolution, Free University Berlin, Königin-Luise-Str. 1-3, 14195, Berlin, Germany

    Harald Hausen

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Hausen, H. Ultrastructure of presumptive light sensitive ciliary organs in larvae of Poecilochaetidae, Trochochaetidae, Spionidae, Magelonidae (Annelida) and its phylogenetic significance. Zoomorphology 126, 185–201 (2007). https://doi.org/10.1007/s00435-007-0040-6

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