Abstract
Aphanoblastella magna n. sp. is described from the gills of the heptapterid catfish Pimelodella avanhandavae Eigenmann, 1917 in southeastern Brazil (Paraná River Basin). This new species most closely resembles Aphanoblastella chagresii Mendoza-Franco, Aguirre-Macedo and Vidal-Martínez, 2007 described from a congeneric fish host in Panama, but can be distinguished by the shape of the accessory piece and shape and size of the ventral and dorsal bars. From the other species of the genus, A. magna n. sp. differs mainly in the shape of the male copulatory organ (MCO), which is sinuous, versus spirally coiled in other species of the genus, except for A. travassosi (Price, 1938), and by the accessory piece which resembles a ‘shoehorn’. Aphanoblastella magna n. sp. is the seventh species of the genus and the first dactylogyrid described from P. avanhandavae. A partial 28S rDNA gene sequence of the new species is also provided; it forms a monophyletic clade with two congeners for which molecular data are available.
Acknowledgements
Two anonymous reviewers are acknowledged for providing helpful suggestions and critical remarks. We also thank the staff of the São Paulo Energy Company (CESP) for the facilities offered for the development of this work, the Institute of Parasitology, Biology Centre of the Czech Academy of Sciences in České Budějovice for hosting A.A.A. and providing the facilities to perform molecular analyses (supported by the Institute of Parasitology – RVO 60077344 and the Czech Science Foundation – P505/12/G112), and Philippe Vieira Alves for helping with molecular analyses. This work was supported by São Paulo Research Foundation (FAPESP) (grant numbers 2011/22603–3 and 2014/14298–4 to F.H.Y.; 2012/22895–7 and 2015/22382–8 to A.A.A.; 2013/25786–7 to P.O.F.Y.; and 2016/50377–1 to R.J.S.) and the National Council for Scientific and Technological Development (CNPq) (grant numbers 309125/2017-0 and 440496/2015–2 to R.J.S.).
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