Malakhov V.V.1, Berezinskaya T.L., Solovyev K.A.2 2005. [Fine structure of sensory organs in chaetognaths. 1. Ciliary fence receptors, сiliary tuft receptors and ciliary loop] // Invertebrate Zoology. Vol.2. No.1: 67–77 [in Russian, with English summary].

Department of Invertebrate Zoology, Faculty of Biology, Moscow State University, Moscow, 119899, Russia. E-mail: 1 vmalakhov@inbox.ru , 2 kotsol@mail.ru

ABSTRACT: The ultrastructural characteristics of ciliary fence receptors, ciliary tuft receptors and ciliary loop were studied in chaetognats Parasagitta elegans and Serra­to­sagitta pseudoserratodentata. Two types of ciliary fence receptors were described as ciliary fence receptors and ciliary tuft receptors. Ciliary fence receptors are short cross series of monociliary cells with unusual inflated non-striated roots. Ciliary tuft receptors are the group of short longitudinal series of monociliary cells with long striated roots. Ciliary loop is a gutter in integumentary epithelium. Ciliary loop subdivided into an internal canal filled with inflated electron-lucent microvilli, and an external part carrying cilia. Possible functions of studied organs are discussed: Ciliary tuft receptors are proposed to be the tactile receptors whereas ciliary fence receptors are probably responsible for the perception of different oscillation frequencies. Ciliary loop function may be analogous to the function of fish lateral line system.

KEY WORDS: Сhaetognatha, sensory organs, ciliary fence receptors, ciliary tuft receptors, ciliary loop, Parasagitta elegans, Serratosagitta pseudoserratodentata.

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