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ISRN Parasitology
Volume 2013 (2013), Article ID 123108, 4 pages
Research Article

Spontaneous Electrical Activity and Spikes in the Tail of Marine Cercariae

1A. N. Severtsov Institute of Ecology and Evolution, Centre of Parasitology, Russian Academy of Sciences, Leninsky Prospect 33, Moscow 119071, Russia
2Sechenov Institute of Evolutionary Physiology and Biochemistry, Laboratory of Evolution of Sense Organs, Russian Academy of Sciences, 44 Thorez Avenue, Saint Petersburg 194223, Russia
3Pskov State University, Faculty of Biology, Lenin Square, 2 Pskov 180760, Russia
4Department of Biosciences, Åbo Akademi University, Artillerigatan 6, 20520 Åbo, Finland

Received 27 May 2013; Accepted 17 July 2013

Academic Editors: D. Cone and A. P. Shinn

Copyright © 2013 O. O. Tolstenkov et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Spontaneous electrical activity is recorded in two species of marine cercariae, Cryptocotyle lingua and Himasthla elongata, with different types of swimming—by glass microelectrode recordings. Slow local field potentials (sLFPs) of low amplitude and fast high amplitude action potentials (APs) are found. The shape of the sLFPs is different in the species and correlates with the type of swimming. Fast high amplitude APs are recorded for the first time in cercariae. The limited number of APs included in the swimming pattern of larva suggests a key role for the spiking neurons in initiating the motility pattern in the cercaria and needs further research.