Barmasova G.A.1,2*, Starunova Z.I.2, Novikova E.L.1, Starunov V.V.1,2 2022. Organization of catecholaminergic system of Pygospio elegans and Platynereis dumerilii (Annelida) // Invertebrate Zoology. Vol.19. No.4: 335–350 [in English].

1 Department of Invertebrate Zoology, St. Petersburg State University, Universitetskaya nab. 7-9, St. Petersburg, 199034 Russia.

2 Laboratory of Evolutionary Morphology, Zoological Institute, Russian Academy of Sciences, Universitetskaya nab. 1, St. Petersburg 199034, Russia.

* Corresponding author:

Galina Barmasova: ORCID 0000-0003-4172-856X

Zinaida Starunova: ORCID 0000-0002-9582-9668

Elena Novikova: ORCID 0000-0002-3740-600X

Viktor Starunov: ORCID 0000-0002-9001-2069

doi: 10.15298/invertzool.19.4.02

ABSTRACT: Catecholamines (CA) are known to play an important role in the physiology of most invertebrates. Here we provide the results on catecholaminergic systems study of two annelid species: Pygospio elegans (Spionidae) and Platynereis dumerilii (Nereididae). The nervous system was studied with the histochemical method of monoamine condensation with glyoxylic acid in combination with confocal laser scanning microscopy. Both animals possess developed catecholaminergic systems with similar general organization. However, in P. dumerilii considerably fewer cells were detected. In both species, CA-positive cells were found in the brain, ventral nerve cord as well as in the stomatogastric system, body wall, palps, prostomium, and regions around the chaetae. According to the cell morphology and their location in the most agile parts of the animal, we suggest CA-positive cells to be mostly proprio- or mechanoreceptors.

KEY WORDS: Nervous system, Catecholamines, Glyoxylic acid fluorescence, Confocal microscopy, Annelida, Pygospio elegans, Platynereis dumerilii.

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