Walteriella n. g. (Monogenoidea: Dactylogyridae) from the gills of pimelodid catfishes (Siluriformes: Pimelodidae) from the Peruvian Amazonia based on morphological and molecular data
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On the basis of morphological and molecular data, Walteriella n. g. is proposed to accommodate the dactylogyrid parasites Walteriella conica n. sp. (type-species) from the gills of Platynematichthys notatus (Jardine) (type-host) and Brachyplatystoma juruense (Boulenger), and Walteriella ophiocirrus n. sp. from the gills of Platystomatichthys sturio (Kner) (type-host), all fish host belonging to the Pimelodidae collected in the Peruvian Amazonia. Species of the new genus are distinguished from other dactylogyrids infecting Neotropical catfishes by the presence of a folded germarium, a male copulatory organ basally articulated to the accessory piece, a cone-shaped seminal receptacle, and ventral and dorsal bars with projections directed anteriorly. Both species of the new genus form a strongly supported lineage closely related to Dactylogyridae gen. sp. 13, a parasite of Hypophthalmus edentatus Spix & Agassiz (Pimelodidae) in an analysis of partial sequences of the 28S rRNA gene. The clade formed by species of Walteriella n. g. and Dactylogyridae gen. sp. 13 is closely related to other dactylogyrids infecting pimelodid catfishes. Based on the morphology of its haptoral elements and copulatory complex, the species Dactylogyridae gen. sp. 13 is morphologically different from species of Walteriella n. g., but its generic assignment is still unclear.
Two anonymous reviewers provided helpful suggestions. The authors are also indebted to Roman Kuchta (Institute of Parasitology, České Budějovice, Czech Republic), Alain de Chambrier (Museum of Natural History, Geneva, Switzerland), Andrea Šimková and Eva Řehulková (Masaryk University, Brno, Czech Republic) for their help during fish examination in Iquitos, Peru. Martin Mortenthaler, Aurora Ramírez and staff of the Acuario Río Momón in Iquitos provided invaluable assistance during fieldwork in Peru. This paper is dedicated to the memory of our dear friend and colleague M. Mortenthaler, who passed away unexpectedly during the preparation of this manuscript.
This study was financially supported by the Czech Science Foundation (project P505/12/G112) and the Institute of Parasitology (RVO: 60077344). CAMP was funded with a postdoctoral fellowship granted by the Consejo Nacional de Ciencia y Tecnología (CONACyT), Mexico (CVU 168157) and by the Percy Laden Fund, Linnaean Society of London to collect fish parasites in Peru.
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Conflict of interest
The authors declare that they have no conflict of interest.
All applicable institutional, national and international guidelines for the care and use of animals were followed.
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