Abstract
Chaetognaths have a pair of eyes below the epidermis on the dorsal surface of the head; an inverted type in the genus Sagitta and an everted type in the genus Eukrohnia. The inverted type is composed of capsule cells surrounding the external surface, one pigment cell at the center of the eye, photoreceptor cells extending distal processes into depressions of the pigment cell and glia cells among the photoreceptor cells. The photoreceptor cell extends a distal process via a connecting piece of ciliary nature. The distal process is composed of a conical body and a distal segment which contains a structure for photon capture. The everted type lacks the pigment cell and the photoreceptor cell is provided with a crystalline cone-like structure at the tip immediately above the photoreceptive microvilli. S. crassa show slow tactic and quick target-aiming swimming toward light. These reactions are telotactic in nature, being achieved through the structural characteristics of the lensless eye Light-dependent diurnal changes in the vertical distribution pattern in the sea are briefly discussed.
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© 1984 Plenum Press, New York
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Goto, T., Yoshida, M. (1984). Photoreception in Chaetognatha. In: Ali, M.A. (eds) Photoreception and Vision in Invertebrates. NATO ASI Series, vol 74. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2743-1_21
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DOI: https://doi.org/10.1007/978-1-4613-2743-1_21
Publisher Name: Springer, Boston, MA
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