[Infrastructural study of photoreceptor organs in the larvae of two Syllidae (Annelida, Polycheta)].

The ultrastructure of the larval eyes of two Syllidae: Syllis amica (subfamily: Syllinae) and Odontosyllis ctenostoma (subfamily: Eusyllinae) were studied. These eyes are composed of a pigmented supportive cell and one or two sensory cells. A dense body, corresponding to a secreted lens, can be observed in the ocular cavity formed by the supportive cell. Such a structure present in O. ctenostoma adult eyes has never been described in S. amica adult eyes.