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The nervous system ofDiplostomum pseudospathaceum Niewiadomska, (Digenea, Diplostomatidae)

I. Nervous system and chaetotaxy in the cercaria

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The study of the nervous system and chaetotaxy ofDiplostomum pseudospathaceum Niewiadomska, cercaria was performed to verify connections between the sensory pattern and the number and arrangement of the commissures. The method of Koelle (1951) was used to detect cholinesterases in the nervous tissue and silver impregnation of the cercaria was used to reveal sensory endings on the body surface. Important differences were found in the structure of the nervous system of this cercaria in comparison with the hypothetical model proposed by Richard (1971). The differences concern the position of the central nerve ganglia, the number of the anterior nerve stems, the number of commissures and innervation of the tail. It has also been shown that particular cycles of sensillae distinguished by Richard (1971) do not correspond exactly to the commissures revealed histochemically. The similarities and differences with observations made by Grabda-Kazubska and Moczoń (1981) onHaplometra cylindracea cercaria are discussed.

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Correspondence to Katarzyna Niewiadomska.

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Niewiadomska, K., Moczoń, T. The nervous system ofDiplostomum pseudospathaceum Niewiadomska, (Digenea, Diplostomatidae). Z. Parasitenkd. 68, 295–304 (1982).

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  • Nervous System
  • Body Surface
  • Cholinesterase
  • Nervous Tissue
  • Hypothetical Model