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Re-validation of Echinostoma miyagawai Ishii, 1932 (Digenea: Echinostomatidae) on the basis of the experimental completion of its life-cycle

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Abstract

The life-cycle of Echinostoma miyagawai, a Eurasian species closely related to E. revolutum, was completed in the laboratory, and the morphology of the larval stages and the adults obtained experimentally was studied. Planorbis planorbis and Anisus vortex were the first intermediate hosts in the brackish Lake Durankulak on the Bulgarian Black Sea coast. Characteristic features of the cercaria include: a prominent collar with 37 spines; a tail as long as the body and with seven conspicuous fin-folds, the two ventral fin-folds being very close to each other; and a specific number and distribution of both the para-oesophageal gland-cell outlets and sensilla. The adult is characterised by: a very elongate body with a constriction at the posterior border of the ventral sucker; a large head collar with relatively small spines; a spherical ventral sucker which is only about half the maximum body width; a long cirrus-sac reaching posteriorly dorsal to the middle of the ventral sucker; indented subglobular testes; and a vitellarium forming two lateral fields of follicles which are almost confluent in the post-testicular space. The species described in this study resembles E. miyagawai, as described by Kosupko, in the morphology of larval stages and both the site and the general morphology of the adults. It differs from both E. revolutum, as described by both Kanev and Našincová, and E. echinatum (also referred to as E. lindoense and E. barbosai by Kanev). The re-examination of Kanev's voucher specimens from his experimental studies used in his delimitation of E. revolutum and E. echinatum showed that the specimens identified by him as E. revolutum represent two distinct forms which consistently differ both from each other and from the redescription of E. revolutum which was based upon them. It also revealed that a number of specimens were wrongly identified and erroneously treated as E. echinatum by Kanev and co-workers; these include members of different genera (Hypoderaeum and Echinoparyphium) and an Echinostoma species of the group possessing 47 collar spines. The relative merits of the features used by Kanev and co-workers in discriminating the closely related Echinostoma spp. are discussed in detail with respect to the experimental evidence provided by these authors.

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Kostadinova, A., Gibson, D., Biserkov, V. et al. Re-validation of Echinostoma miyagawai Ishii, 1932 (Digenea: Echinostomatidae) on the basis of the experimental completion of its life-cycle. Syst Parasitol 45, 81–108 (2000). https://doi.org/10.1023/A:1006241610689

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