Three New Species of Demidospermus (Monogenea: Dactylogyridae) Parasitic on Brachyplatystoma filamentosum (Siluriformes: Pimelodidae) From the Araguaia River, Brazil

Abstract

Three new species of dactylogyrids (Monogenea) from the Araguaia River in Brazil are described herein. Specimens of Demidospermus ceccarellii n. sp., Demidospermus brachyplatystomae n. sp., and Demidospermus araguaiaensis n. sp. were collected from the gills of the siluriform fish, Brachyplatystoma filamentosum (Lichtenstein, 1819). The 3 new species can be easily distinguished from their congeners by the shape of the male copulatory organ (MCO) and accessory piece. Demidospermus ceccarellii n. sp. presents a J-shaped and robust MCO, a base with a short sclerotized margin, and a slightly curved and robust accessory piece with the base slightly dilated. In contrast, D. brachyplatystomae n. sp. has a thin MCO forming an incomplete ring, a base with an irregular sclerotized margin, and a long and curved accessory piece with a wider distal portion. Demidospermus araguaiaensis n. sp. has a thin MCO with a base directly coupled to the accessory piece and an articulated accessory piece that is sinuous in shape in the distal portion. In addition, the 3 species present haptoral hooks similar in shape and size and, thus, were compared in detail with the other Demidospermus species with this particular characteristic. This is the first record of monogeneans that are parasitic on B. filamentosum.

Morphology and molecular characterization of Demidospermus spirophallus n. sp., D. prolixus n. sp. (Monogenea: Dactylogyridae) and a redescription of D. anus in siluriform catfish from Brazil

“…23), parasites of the pimelodids B. juruense and B. vaillantii, respectively, from Iquitos, Peru. However, observing their phylogenic results and carefully analysing the morphology of D. mortenthaleri (see Mendoza-Palmero et al, 2012), and other species of Demidospermus described parasitizing Brachyplatystoma filamentosum (Lichtenstein, 1819) from Brazil (Cepeda & Luque, 2010) (D. ceccarelli, D. brachyplatystomae and D. araguaiaensis), we hypothesize that these species do not in fact belong to this genus, and so should be included in a new genus. Although these species resemble each other, they show conspicuous differences in terms of the diagnostic characteristics of the Demidospermus genus (e.g.…”

A new species of Demidospermus (Platyhelminthes, Monogenea, Ancyrocephalidae) from the catfish Parapimelodus valenciennis in Samborombón Bay, Argentina

“…nov. resembles D. cecarrelli Cepeda et Luque, 2010 by the J-shaped MCO. However, the new species can be distinguished from D. ceccarelli by the morphology of accessory piece of MCO.…”

“…Currently, there are 20 nominal species of Demidospermus (Platyhelminthes, Monogenea, Ancyrocephalidae) parasitizing siluriform fishes from South America (Kritsky and Gutiér-rez 1998, França et al 2003, Cohen and Kohn 2008, Mendoza-Franco and Scholz 2009, Cepeda and Luque 2010, Monteiro et al 2010. The major numbers of species were reported from Brazilian waters, a total of 11 species found in 7 hosts species.…”

Desenvolvimento Da Economia Circular Na Indústria E Demais Organizações Brasileiras

“…Esse fator pode ser limitante na frequência de troca de hospedeiros entre espécies ovíparas, restringindo essas espécies aos loricarídeos(VIANNA, 2007). Demidospermus ceccarelliiCepeda & Luque, 2010 Demidospermus brachyplatystomae Cepeda & Luque, 2010e Demidospermus araguaiaensisCepeda & Luque, 2010 parasintando Brachyplatystoma filamentosum (Lichtenstein) capturados no rio Araguaia no Mato Grosso.Diplectanidae Monticelli, 1903 é composta de membros parasitos de diversas ordens de peixes, como Perciformes, Cyprinodontiformes, Siluriformes, Anguiliformes, Pleuronectiformes, Scorpaeniformes, Beloniformes, Cypriniformese Clupeiformes(DOMINGUES, 2004). A maioria é composta por espécies marinhas, mas algumas são registradas de espécies de água doce, sendo que muitas têm sido egistradas em peixes de cultivo e são consideradas de importância econômica.…”