The life cycle ofPlagiorchis spec. 1, a species of thePlagiorchis elegans group (Trematoda, Plagiorchiidae) (original) (raw)

Abstract

The life cycle was investigated of a trematode of the genus_Plagiorchis_, named provisionally_Plagiorchis spec. 1_. Cercariae were obtained from the fresh-water snail_Lymnaea stagnalis_ L. from two localities remote from each other: the Roggenburg fish-ponds near Ulm, Federal Republic of Germany, and the “Obedska bara” nature reserve near Belgrade, Yugoslavia. Material from the two trematode populations was used separately for infection experiments and compared, to show the constancy of the morphological features of the developmental stages. Experimental second intermediate hosts were larvae of Ephemeroptera (Cloëon), Trichoptera, Zygoptera, Nematocera (Chaoborus, Culex_-type, Chironomidae), Dytiscidae, and to a lesser degree_Asellus aquaticus. Chickens were fed with infested larvae and adult trematodes were recovered from the intestine. The first trematode eggs appeared in the faeces after 6–8 days. They matured within 30–50 days at room temperature. Laboratory-reared_Lymnaea stagnalis_ from two age groups (3.5 months and 2 years) were fed mature eggs. Both age groups became infected by eggs of the Roggenburg population. Cercariae emerged after 44–54 days (room temperature) and were identical with those from the natural habitat. Further fresh-water snails were tested as possible first intermediate hosts by feeding them mature eggs. In one_Galba palustris_ Müll. the trematode investigated developed up to the cercarial stage, whereas experiments with_Radix auricularia_ L.,R. peregra Müll. and_Planorbarius corneus_ L. were negative. The cercaria is a Xiphidiocercaria armata with seven penetration glands on one side and eight on the other. Its chaetotaxy is elaborated. The metacercaria is characterized by hardly any growth in the encysted stage and an active process of excystation. The morphology and biology of all developmental stages and the chaetotaxy of the cercariae were identical in both populations. The adults resemble several species in the_Plagiorchis elegans_ group compiled by Krasnolobova. According to the life cycle, the investigated species mostly corresponds with_Plagiorchis laricola_ as described by Ždárská and_P. elegans_ as described by Styczyńska-Jurewicz and Samnaliev et al. There are differences and contradictory data in the literature on these species, which do not allow an exact determination until further knowledge about related forms is available.

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1. Abt. Ökologie und Morphologie der Tiere, Universität Ulm, Oberer Eselsberg, D-7900, Ulm, Federal Republic of Germany
   Dieter Bock

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Bock, D. The life cycle of_Plagiorchis spec. 1_, a species of the_Plagiorchis elegans_ group (Trematoda, Plagiorchiidae).Z. Parasitenkd. 70, 359–373 (1984). https://doi.org/10.1007/BF00927822

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• Accepted: 12 October 1983
• Issue date: May 1984
• DOI: https://doi.org/10.1007/BF00927822

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