Three New Species of Cosmetocleithrum (Monogenea: Dactylogyridae) Gill Parasites of Trachelyopterus galeatus (Siluriform
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ORIGINAL PAPER
Three New Species of Cosmetocleithrum (Monogenea: Dactylogyridae) Gill Parasites of Trachelyopterus galeatus (Siluriformes: Auchenipteridae) in Southeastern Brazil Priscilla de Oliveira Fadel Yamada1 · Fabio Hideki Yamada2 · Reinaldo José da Silva1 Received: 7 July 2020 / Accepted: 11 September 2020 © Witold Stefański Institute of Parasitology, Polish Academy of Sciences 2020
Abstract Purpose To describe three new species of Cosmetocleithrum in the gills of Trachelyopterus galeatus (Siluriformes, Auchenipteridae) from Aguapeí River, Upper Paraná River basin, São Paulo State, Brazil. Methods Fifty-three specimens of T. galeatus were captured in the mouth of the Aguapeí River from August 2013 to June 2014. Monogeneans were mounted unstained in Hoyer’s and Gray and Wess’s medium. Results Cosmetocleithrum spathulatum sp. n., Cosmetocleithrum baculum sp. n., and Cosmetocleithrum galeatum sp. n. differ from all known congeneric species mainly in the morphology of the accessory piece (i.e. spatulate-shaped, claviform, and a straight rod with hook-shaped distal portion, respectively). Also, the three new species share hooks with different sizes with hooks pairs 5 and 7 bigger than others and with an erect delicate point, inconspicuous thumb, longer shaft, and slender shank. Conclusions To date, 18 species of Cosmetocleithrum were recognised parasitizing siluriforms in the Neotropical region. The present study expands the number to 21 species, however, despite this increase, the number of known taxa of monogeneans in neotropics is far from representing the ideal situation. Keywords Aguapeí River · Ancyrocephalinae · Catfishes · Neotropical region · Paraná River basin
Introduction Freshwater fishes of the order Siluriformes present a rich fauna of gill monogeneans in the Neotropical region [1–3]. Among Siluriformes, fishes of the family Auchenipteridae harbour dactylogyrids from three genera in Brazil and Peru: Cosmetocleithrum Kritsky, Thatcher and Boeger, 1986, Demidospermus Suriano, 1983, and Vancleaveus Kritsky, Thatcher and Boeger, 1986 [4]. Cosmetocleithrum was erected by Kritsky et al. [5] to accommodate dactylogyrids parasitizing siluriforms in the Neotropical region. Species of this genus are characterized mainly by having a dorsal bar with two submedial * Priscilla de Oliveira Fadel Yamada [email protected] 1
Instituto de Biociências, Setor de Parasitologia, UNESP, Univ Estadual Paulista, Campus de Botucatu, Botucatu, SP, Brazil
Departamento de Ciências Biológicas, Universidade Regional do Cariri (URCA), Crato, CE, Brazil
2
projections. To date, 18 valid species of Cosmetocleithrum are known to parasitize freshwater fishes of the families Pimelodidae, Doradidae, and Auchenipteridae [3, 5–10] (Table 1). Among them, four species parasitize hosts of the family Auchenipteridae: Cosmetocleithrum striatuli Abdallah, Azevedo and Luque, 2012 from Trachelyopterus striatulus (Steindachner, 1877) and Auchenipterus nuchalis (Spix and Agassiz, 1829), Cosmetocleithrum laciniatum Yamada,
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