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  • Title: Histochemical demonstration of a rhodopsin-like substance in the eye of the arrow-worm, Spadella schizoptera (Chaetognatha).
    Author: Goto T, Yoshida M.
    Journal: Exp Biol; 1988; 48(1):1-4. PubMed ID: 3268423.
    Abstract:
    The presumed photoreceptive region of the arrow-worms of the species Sagitta crassa and Spadella schizoptera consists of perforated lamellae which are unique as the photoreceptive structure. The existence of a visual pigment in this region was demonstrated by a histofluorescent technique using Spadella schizoptera, whose presumed photoreceptive region was much larger than in Sagitta crassa. A specific fluorescence, indicative of the presence of retinal-based proteins, appeared only in the perforated lamellar region. The result suggests that the perforated lamellae contain a rhodopsin-like substance and could be the primary photoreceptive site.
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