Morphology and host–parasite interaction of Henneguya azevedoi n. sp., parasite of gills of Leporinus obtusidens from Mogi-Guaçu River, Brazil

Abstract

Henneguya azevedoi n. sp. is described from the piava (Leporinus obtusidens). Between 2005 and 2007, 60 fish were collected from the Mogi-Guaçu River near Cachoeira de Emas Falls located in the municipality of Pirassununga, state of São Paulo, Brazil. A total of 70% had plasmodia of the parasite. The plasmodia were white, spherical, and measured 40-200 μm in diameter. Histopathological analysis revealed that the development of the parasite was intralamellar and caused stretching of the epithelium, with accentuated deformation, as well as compression of the capillary and adjacent tissues. Ultrastructural analysis revealed that the wall of the plasmodium was a single membrane in direct contact with the host cells and contained pinocytic canals that extended into the plasmodium. The development of the parasite was asynchronous, with the earliest stages at the periphery and mature spores in the central region. Mature spores were elongated in the frontal view [mean ± standard deviation (range)]: 45.2 ± 0.6 (45.0-47.0) μm in total length, 10.0 ± 0.07 (9.9-10.2) μm in body length, 35.6 ± 0.9 (34.9-36.5) μm in caudal process length, and 4.4 ± 0.4 (4.0-5.0) μm in body width. The polar capsules were elongated and equal in size: 3.8 ± 0.3 (3.5-4.0) μm in length and 1.0 μm in width. The polar filaments were coiled in six to seven turns and perpendicular to the axis of the capsule. Scanning electron microscopy revealed smooth valves and a conspicuous rim around the spore body. This is the first time that a myxosporean has been reported in L. obtusidens.

Henneguya cuniculator sp. nov., a parasite of spotted sorubim Pseudoplatystoma corruscans in the São Francisco Basin, Brazil

“…The sporogenesis process of H. cuni culator sp. nov. was similar to those observed in other species of Henneguya (Matos et al 2005, Ali et al 2007, Abdel-Ghaffar et al 2008, Azevedo et al 2008, Naldoni et al 2009, Barassa et al 2012. However, the plasmodia of H. cuniculator sp.…”

Three novel myxobolid species of genera Henneguya and Myxobolus (Myxosporea: Bivalvulida) from marine fish in Japan

“…The synopsis of the species of the genus Henneguya provided by Eiras in 2002 included 146 nominal species (Eiras 2002). Since publication of Eiras' synopsis, to the best of our knowledge, more than 33 species have been newly recorded and added to this genus (e.g., Dyková et al 2011; Barassa et al 2012). However, in 2005, Lom and Dyková (2006) counted 204 nominal species for this genus.…”

Mixosporídeos e nematóides em Hemiodopsis microlepis (Teleostei: Hemiodontidae) do rio Gurguéia-Bom Jesus-Pi, Brasil

“…Alves et al (31) examinaram 30 peixes da espécie Poecilia reticulata Peters, 1859 provenientes de psicultura ornamental, verificando que 93,4% dos peixes estavam parasitados por Camallanus contti Fujita, 1927. Entretanto, no presente fibrótico isolando o parasito e prevenindo sua dispersão para os tecidos adjacentes(37). Entretanto, a importância da patogenicidade não esta apenas no caráter letal da doença, mas também no grau da lesão causada a alguns tecidos.…”