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Neotropical Monogenoidea. 50. Oviparous gyrodactylids from loricariid and pimelodid catfishes in Brazil, with the proposal of Phanerothecioides n. g., Onychogyrodactylus n. g. and Aglaiogyrodactylus n. g. (Polyonchoinea: Gyrodactylidea)

Systematic Parasitology volume 66, pages 1–34 (2007)Cite this article

Abstract

The diagnosis of Phanerothecium Kritsky & Thatcher, 1977 is amended, and Phanerothecioides n. g., Onychogyrodactylus n. g. and Aglaiogyrodactylus n. g., all comprised of oviparous gyrodactylids (Monogenoidea: Polyonchoinea), are proposed to accommodate 11 of the 15 species (14 new to science) herein described and/or reported from loricariid and pimelodid catfishes (Teleostei: Siluriformes) in Brazil: Phanerothecium harrisi Kritsky & Boeger, 1991, P. spinatoides n. sp. and P. deiropedeum n. sp. all from Hypostomus spp.; P. spinulatum n. sp. from Hypostomus cf. regani; Phanerothecioides agostinhoi n. g., n. sp. (type-species) from Hypostomus spp. and Pseudoplatystoma fasciatum; Onychogyrodactylus sudis n. g., n. sp. (type-species) and O. hydaticus n. sp. both from Ancistrus multispinus; Aglaiogyrodactylus forficulatus n. g., n. sp. (type-species) from Kronichthys lacerta; A. pedunculatus n. sp. from Hisonotus sp.; A. guttus n. sp. from Pseudotothyris obtusa; A. salebrosus n. sp., A. conei n. sp. and A. ctenistus n. sp. all from Pareiorhaphis parmula; and A. calamus n. sp. and A. forficuloides n. sp. both from Schizolecis guntheri. Phanerothecioides n. g. is characterised by oviparous forms lacking superficial and deep haptoral bars and pregermarial vitelline follicles, and by having a conspicuous testis in adult specimens, a syncytial prostatic gland, a reduced copulatory sac and vitelline ducts in the form of an inverted ‘U’. Onychogyrodactylus n. g. is differentiated from all other oviparous gyrodactylid genera by its members having a spine-like accessory sclerite enclosed in a separate pouch associated with the terminal male genitalia. Species of Aglaiogyrodactylus n. g. possess H-shaped vitelline ducts and a complex accessory piece and sclerotised or non-sclerotised male copulatory organ enclosed within the copulatory sac.

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Acknowledgements

The authors gratefully acknowledge the following individuals and agencies for support of this study: Eric Hoberg (U.S. National Parasite Collection) and Augustín Jiménez (University of Nebraska State Museum) for the loan of specimens; Roberto Reis, Carlos Lucena, Vinicius Bertaco, Edson Pereira, Pablo Lehmann (Museu de Ciência e Tecnologia da Pontifícia Universidade Católica do Rio Grande do Sul), Paulo H. F. Lucinda (Universidade Federal do Tocantins), and Vinicius Abilhoa and Luis F. Duboc (Museu Capão da Imbuia Curitiba) for identifying hosts; Marcus V. Domingues (Universidade Federal do Paraná) and V. Abilhoa and L. F. Duboc for assistance during field collections; and Sérgio Agostinho, Elineide Marques and their team (Universidade Federal do Tocantins) for hosting us during our stay in Porto Nacional and for allowing us to collect the parasites from fishes collected for their studies on productivity in the Usina HidroElétrica Luís Eduardo Magalhães Reservoir. The Conselho Nacional de Desenvolvimento Cientifíco e Tecnólogico (CNPq) provided financial support for the study and a scholarship to RTV

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  1. Department of Health and Nutrition Sciences, Idaho State University, Campus Box 8090, Pocatello, Idaho, 83209, USA

    Delane C. Kritsky

  2. Conselho Nacional de Desenvolvimento Científico e Tecnológico and Departamento de Zoologia, Universidade Federal do Paraná, Caixa Postal 19073, Curitiba, Paraná, 81531-990, Brazil

    Rogério T. Vianna & Walter A. Boeger

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  1. Delane C. Kritsky
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  2. Rogério T. Vianna
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  3. Walter A. Boeger
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Correspondence to Delane C. Kritsky.

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Kritsky, D.C., Vianna, R.T. & Boeger, W.A. Neotropical Monogenoidea. 50. Oviparous gyrodactylids from loricariid and pimelodid catfishes in Brazil, with the proposal of Phanerothecioides n. g., Onychogyrodactylus n. g. and Aglaiogyrodactylus n. g. (Polyonchoinea: Gyrodactylidea). Syst Parasitol 66, 1–34 (2007). https://doi.org/10.1007/s11230-006-9053-7

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Keywords

  • Seminal Vesicle
  • Copulatory Organ
  • Vitelline Follicle
  • Accessory Piece
  • Head Organ