Some ultrastructural aspects of Henneguya striolata sp. nov. (Myxozoa, Myxosporea), a parasite of the Amazonian fish Serrasalmus striolatus

Casal, Graça; Matos, Edílson; Azevedo, Carlos

doi:10.1007/s004360050216

Cited by 34 publications

(27 citation statements)

References 7 publications

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“…Fibrous material resembling aggregated actin anchoring the mural cells of the presporogonic cells of the malacosporean Tetracapsuloides bryosalmonae was also reported by Morris & Adams (2007). The presence of microfilaments in the developmental stages of myxosporeans was also reported by Casal et al (1997), who identified myosin filaments occupying the space of pericyte cells of H. striolata Casal et al 1997. The morphologic and morphometric characteristics of Henneguya cuniculator sp.…”

Section: Discussionmentioning

confidence: 86%

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

Naldoni¹,

Maia²,

Silva³

et al. 2014

Dis. Aquat. Org.

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Section: Discussionmentioning

confidence: 86%

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

Naldoni¹,

Maia²,

Silva³

et al. 2014

Dis. Aquat. Org.

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“…In those few works where the researchers describing the species precisely indicated the location of the developmental site, most of the known species belonged to the intralamellar type of the gill locations proposed by the present author. Regarding Henneguya species, such a (lamellar) location has been reported by McCraren et al (1975) for the Henneguya species studied by them, by Dyková & Lom (1978) for H. psorospermica, by Cone (1979) for H. doori, by Shariff (1982) for H. shaharini, by Kalavati & Narasimhamurti (1985) for H. waltairensis, by Haaparanta et al (1994) and Molnár (1998) for H. creplini, and by Casals et al (1997) for H. striolata. In addition to the findings published by Current & Janovy (1978), the paper written by Obiekezie & Enyenihi (1988) on H. chrysichthys contains data on the possible interlamellar location of Henneguya species.…”

Section: Discussionmentioning

confidence: 95%

Site preference of fish myxosporeans in the gill

2002

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In addition to the morphological and size characteristics of the spores, indicating the exact location and tissue specificity is also essential for differentiation of the large number of species belonging to the group of gill-parasitic fish, the myxosporeans. According to the observations of the present author, Myxobolus, Henneguya and Thelohanellus species are characterised by strict tissue specificity, and species showing affinity to the epithelium, connective tissue, cartilage or vascular tissue usually occur in a strictly defined location within the gill apparatus. Some of the species typically form plasmodia in the lamellae of the gill and others in the gill filaments. Yet other species develop their plasmodia at the base of the gill filament or in the gill arch. Instead of the generally accepted but misleading terms 'intra-' and 'interlamellar', the present author distinguishes interlamellar-epithelial and intralamellar-vascular types in the case of plasmodia developing in the gill lamellae, and intrafilamental-epithelial, intrafilamental-vascular and intrafilamental-chondroidal types in the case of plasmodia developing in the gill filaments. Regarding site of development within the gill, the location of basifilamental plasmodia and that of plasmodia developing in the cartilaginous matrix, connective tissue or blood vessels of the gill arch are well distinguishable from the above types.

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“…have been reported (Cordeiro et al 1984, Kent and Hoffman 1984, Azevedo and Matos 1989, 1995, 1996a, b, 2002, Rocha et al 1992, Casal et al 1997.…”

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confidence: 86%

Fine structure of Henneguya pilosa sp. n. (Myxozoa: Myxosporea), parasite of Serrasalmus altuvei (Characidae), in Brazil

Azevedo¹,

Matos²

2003

FOLIA PARASIT

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Abstract. Henneguya pilosa sp. n., a new species of myxosporean from the gill filaments of the white piranha, Serrasalmus altuvei Ramirez, 1965 (Characidae), a freshwater teleost fish collected in the Zoological Garden of the city of Teresina (Piauí), Brazil, is described from light and transmission electron microscope observations. This myxosporean produced small plasmodia (up to 0.2 mm in diameter), each one containing all life-cycle stages of the parasite, including numerous spores. The spores, laterally compressed, averaged 54.2 (52.3-56.0) µm in total length and consisted of two unequal valves adhering together along the suture line and two caudal processes. The spore body measured 21.1 (20.0-23.1) µm in length, 5.9 (5.5-6.3) µm in width, and 2.2 (1.9-2.6) µm in thickness. The two equal ellipsoidal polar capsules of 7.4 (7.1-7.6) µm long and 1.2 (1.0-1.3) µm wide possessed a polar filament with 11-12 (rarely 13) turns. All surfaces of the spores were covered with a tightly adherent complex network of numerous densely ramified granulo-fibrillar masses, the longest measuring 1.5 µm long, observed around the caudal processes. The prevalence of infection was 30%. The taxonomic affinities of this parasite with other of the same genus in freshwater South American fish species are discussed.The class Myxosporea of the phylum Myxozoa contains numerous species, some of which are pathogens, parasitizing different fish organs and tissues (Lom 1989, Lom and Dyková 1992, Eiras 2002. Among the myxosporeans, the genus Henneguya Thélohan, 1892, which includes at least, 126 species (Lom and Dyková 1992), is one of the most important pathogens of freshwater and marine fishes. Although there are numerous detailed descriptions of species of the genus Henneguya from fishes of nearly all geographical areas, little is known about South American species, mainly the Brazilian species. These were recently listed with summarized original descriptions (Gioia and Cordeiro 1996), most of them only illustrated by light microscopical records and diagrammatic drawings of the mature spores (see Nemeczek 1926, Pinto 1928, Guimarães and Bergamin 1934, Jakowska and Nigrelli 1953, Walliker 1969, Cordeiro et al. 1984.Recently, in some Brazilian fish, mainly in the Amazonian fish, the ultrastructure of different life-cycle stages as well as other details leading to the spore identification of some Henneguya spp. have been reported (Cordeiro et al. 1984, Kent and Hoffman 1984, Azevedo and Matos 1989, 1995, 1996a, b, 2002, Rocha et al. 1992, Casal et al. 1997.In this paper, we describe light and electron microscopical data of some life-cycle stages, including spores of a new myxosporean species. MATERIALS AND METHODSSpherical whitish cysts located in the gill filaments and surrounding host tissues bearing plasmodia were removed from 30 examined freshwater white piranha Serrasalmus altuvei Ramirez, 1965 (Characidae) (Brazilian common name "Piranha branca") (prevalence of 30%) collected in the Zoological Garden of the city of Teresina (Piauí, Northe...

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Some ultrastructural aspects of Henneguya striolata sp. nov. (Myxozoa, Myxosporea), a parasite of the Amazonian fish Serrasalmus striolatus

Cited by 34 publications

References 7 publications

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

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

Site preference of fish myxosporeans in the gill

Fine structure of Henneguya pilosa sp. n. (Myxozoa: Myxosporea), parasite of Serrasalmus altuvei (Characidae), in Brazil

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