Fofanova E.G.1, Mayorova T.D.2, Voronezhskaya E.E.1 2017. Paradoxical effect of serotonin on ciliary locomotion of the adult archiannelid worms Dinophilus gyrociliatus and D. taeniatus (Annelida: Polychaeta) // Invertebrate Zoology. Vol.14. No.2: 114–120 [in English].

1 Institute of Developmental Biology, RAS, Vavilova str., 26, 119334, Moscow, Russia. E-mail: ;

2 NINDS, NIH, 49 Convert Dr., Md UDS. E-mail:

ABSTRACT: Immunochemical detection of serotonin (5-HT) and tubulin in D. gyrociliatus and D. taeniatus revealed similar anatomical structures of ventral locomotory ciliary field and underlying 5-HT-immunoreactive nerve network in both young juvenile and adult worms. External application of 5-HT and serotonin biochemical precursor (5-HTP) resulted in increased level of 5-HT within nervous structures in both juveniles and adults. However, while 5-HT and 5-HTP increased speed of gliding locomotion in juvenile worms, the same concentration of drugs decreased significantly or did not affect locomotion of adults. Thus, 5-HT activates the gliding locomotion in juvenile Archiannelid worms similar to larvae of annelids, molluscs and flatworms which use cilia for locomotion. Altered mode of 5-HT action on the locomotion of adult Archiannelid worms indicates reorganization of the 5-HT cilia controlling system during Dinophilid maturation.

doi: 10.15298/invertzool.14.2.03

KEY WORDS: ventral ciliary field, serotonin network, gliding locomotion, inhibition of adult locomotion.

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