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Rotifer Nervous System Visualized by FMRFamide and 5-HT Immunocytochemistry and Confocal Laser Scanning Microscopy

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Abstract

We present the first results of immunocytochemical (ICC) observations on serotonin (5-HT) and FMRFamide (Phe–Met–Arg–Phe–NH2) immunoreactivity patterns in the rotifer nervous system investigated using a confocal laser scanning microscope (CLSM). Three species of rotifers are studied: Platyias patulus (Plationus patulus, Segers et al., 1993; Hydrobiologia 268: 1–8), Euchlanis dilatata and Asplanchna herrickii. Independently from their systematic position, these species possess similar nerve structures. However, some differences were observed in the innervation of the corona, mastax, foot, and mostly in the pattern of the cerebral neurons. The general numbers of 5-HT-immunoreactive (IR) and FMRFamide-IR neurons are low (10–34), but constant for each species. The sizes of the neurons vary from 2, 5 to 10 μm. From 4 to 14 cerebral neurons lie at different levels and are arranged into an X- or a ring- or a curved arch shape. One or two pairs of neurons are localized along longitudinal nerve cords. Double staining of 5-HT and FMRFamide-IR elements shows no co-localization.

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Authors and Affiliations

  1. Zoological Institute, Russian Academy of Sciences, 199034, St. Petersburg, Russia

    Elena A. Kotikova & Olga I. Raikova

  2. Department of Biology, Abo Akademi University, FIN-20520, Åbo, Finland

    Maria Reuter & Margaretha K. S. Gustafsson

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  1. Elena A. Kotikova
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  2. Olga I. Raikova
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  3. Maria Reuter
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  4. Margaretha K. S. Gustafsson
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Correspondence to Maria Reuter.

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Kotikova, E.A., Raikova, O.I., Reuter, M. et al. Rotifer Nervous System Visualized by FMRFamide and 5-HT Immunocytochemistry and Confocal Laser Scanning Microscopy. Hydrobiologia 546, 239–248 (2005). https://doi.org/10.1007/s10750-005-4203-5

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