Two new nematodes, Paraseuratoides ophisterni gen. et sp. n. (Quimperiidae) and Philometra ophisterni sp. n. (Philometridae), from the swamp-eel Ophisternon aenigmaticum in Mexico

Aim The distributional patterns of helminthological fauna of freshwater fishes were analysed to postulate a general hypothesis on the relationships of some Mexican hydrological systems.Location Eight hydrological systems of central and eastern Mexico were studied and compared with records from Nicaragua.Methods A Parsimony Analysis of Endemicity (PAE) was applied to the presence/ absence of ninety-two helminth parasite taxa (Monogeneans, Digeneans, Cestodes, Acanthocephalans and Nematodes) of freshwater fishes, from eight Mexican hydrological systems, using the Hennig86 program. ResultsThe results represent the first attempt for a biogeographical analysis through application of the PAE method to the distributional patterns of helminth parasites of freshwater fishes in Mexico. A single most parsimonious cladogram was obtained, which grouped all the Neotropical systems in accordance with previous proposals based on other plant and animal taxa. Main conclusionsThe most basal systems were Santiago and Lerma basins, which exhibited Nearctic affinities. The remaining areas of the cladogram showed Neotropical affinities. All the southeastern systems were grouped in a clade with the Nicaragua system, providing support for a ÔMesoamerican provinceÕ based on helminth parasites of cichlids. The cladogram also suggests that the treatment of the Lerma-Santiago basin as a single biogeographical unit is inaccurate and that they should be treated as separate systems.

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“…Using published faunal surveys (Kritsky et al. , 1994; Moravec et al. , 1995, 2002a,b,c; Scholz et al.…”

Section: Methodsmentioning

confidence: 99%

Parsimony Analysis of Endemicity (PAE) of Mexican hydrological basins based on helminth parasites of freshwater fishes

Aguilar-Aguilar

Contreras-Medina

Salgado‐Maldonado

2003

Journal of Biogeography

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“…Studies of the parasites of the fish in the Papaloapan basin began in 1954 and are largely taxonomic treatments concentrating mostly on fish in the Los Tuxtlas area and particularly Catemaco Lake, Veracruz (Caballero and Winter 1954;Lamothe-Argumedo 1974Lamothe-Argumedo and Ponciano-Rodrı´guez 1986;Caballero-Deloya 1977;Salgado-Maldonado 1978;Salgado-Maldonado et al 1992, 1998Garcı´a-Prieto 1990;Garcı´a-Prieto et al 1996;Pe´rez et al 1992;Jime´nez-Garcı´a 1993;Moravec 1998;Moravec et al 1998Moravec et al , 2000Moravec et al , 2002aCaspeta-Mandujano et al 1999Salgado-Maldonado 2000, 2001;Scholz et al 2001b;Pa´ez-Rodrı´guez et al 2002;Aguilar-Aguilar et al 2003a;Mendoza-Franco et al 2003b). More recent studies addressing the role of freshwater fishes as transmitters of the human gnathostomiasis have been done in the Temascal Reservoir, Oaxaca (Almeyda-Artigas 1991; Almeyda-Artigas et al 1995;Lamothe-Argumedo 1977;Lamothe-Argumedo et al 1989).…”

Section: Introductionmentioning

confidence: 99%

Helminth parasites in freshwater fish from the Papaloapan river basin, Mexico

et al. 2005

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A checklist based on previously published records and original data is presented for the helminth parasites reported in 35 fish species from nine families from the Rio Papaloapan basin, east Mexico. The checklist contains 85 taxa from 39 helminth families. Trematodes and nematodes were the most abundant taxonomic groups. The helminth fauna in the fish of the Papaloapan River basin predominantly consists of Neotropical species that are largely autogenic. The introduced species Centrocestus formosanus was the most widely distributed helminth, infecting 16 host species. Ten of the recorded helminth species have only been found in fish from the Papaloapan. This inventory contributes 157 new host records, and reports the presence of 30 helminth species in the Papaloapan for the first time . This inventory shows the richness of helminth parasite species in the fish of the Papaloapan River basin in comparison with the other hydrological basins in Mexico. It also demonstrates that this fauna is typically Neotropical and quite similar to that from the neighboring basins of the Grijalva-Usumacinta system and the Yucatan Peninsula. The data also suggest highly effective transmission between environments within the same basin and that the regional parasite fauna is strongly influenced by fish community composition.

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“…Moreover, many species are poorly described, because females are sensitive to osmotic pressure and quickly burst in water and often only damaged specimens or body fragments are available to study. In addition to morphological features, data on the site of localisation of gravid females in the host's body are important for the identification of philometrids (Moravec and Rohde 1992, Moravec et al 2002, 2004.…”

Section: Discussionmentioning

confidence: 99%

Two new species of Philometra (Nematoda: Philometridae) from needlefishes (Belonidae) in Iraq, with a key to Philometra spp. parasitic in the host\'s subcutaneous tissue, fins and musculature

Moravec¹,

Ali²

2005

FOLIA PARASIT

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Abstract. Two new nematode species, Philometra strongylurae sp. n. and Philometra tylosuri sp. n., are described from female specimens collected from needlefishes (Belonidae, Beloniformes) off the Fao coast, Basrah, Persian Gulf, in Iraq. Philometra strongylurae (gravid females with larvae) was recorded from the subcutaneous tissue, muscles of beak and gills of Strongylura leiura (type host) and S. strongylura, whereas P. tylosuri (nongravid females) from the musculature and the subcutaneous tissue of Tylosurus crocodilus. The former is characterized mainly by the presence of eight markedly large cephalic papillae, conspicuously large anterior oesophageal bulb and by the length of body (15-20 mm); the latter by eight minute cephalic papillae, poorly developed oesophageal bulb and by the body length (46-72 mm). A key to Philometra spp. with gravid females parasitic in the subcutaneous tissue, fins or musculature of fishes is provided.Parasitological examinations of three species of marine fishes, the banded needlefish Strongylura leiura (Bleeker, 1850), the spottail needlefish Strongylura strongylura (van Hasselt, 1823) MATERIALS AND METHODSFishes were deep-frozen after capture and were dissected in the laboratory; the skin was removed to reveal the parasites. Nematodes recovered were washed in physiological saline, fixed in Berland's fluid (19 parts pure glacial acid, 1 part 40% formaldehyde solution), and stored in 70% ethanol. For light microscopical examination, they were cleared with glycerine. Drawings were prepared with the aid of a Zeiss microscope drawing attachment. After examination, specimens were stored in 70% ethanol. Two specimens of each species (complete specimens or body fragments) were also used for scanning electron microscopy. Nematodes were transferred to 4% formaldehyde solution and postfixed in 1% osmium tetroxide, dehydrated through a graded ethanol series, critical point dried and sputter-coated with gold; they were examined using a JEOL JSM-6300 scanning electron microscope at an accelerating voltage of 15 kV. All measurements are in micrometres unless otherwise stated. Scientific names of fishes follow Froese and Pauly (2004). Since many specimens of Philometra recovered from needlefishes were unidentifiable to species because of their poor condition and because more members of Philometra may occur in the same fish host species, data could not be interpreted to provide prevalence and intensity of infection. RESULTSPhilometra strongylurae sp. n. Figs. 1, 2Description of gravid female (4 specimens; measurements of holotype in parentheses; measurements of 2 additional subgravid females in square brackets): Body of live specimens red, that of fixed specimens greyish, with distinctly visible light-brown intestine. Body cylindrical,] mm long, somewhat tapering at both ends; posterior part somewhat narrower than anterior part; maximum width of body 666-925 (884) [571 and 625] at region of oesophagus, width of cephalic end 204-299 (286) [231 and 258], of caudal end 204-231 (204) [19...

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Two new nematodes, Paraseuratoides ophisterni gen. et sp. n. (Quimperiidae) and Philometra ophisterni sp. n. (Philometridae), from the swamp-eel Ophisternon aenigmaticum in Mexico

Abstract: Abstract. Two new nematodes, Paraseuratoides ophisterni gen. et sp. n. (Seuratoidea: Quimperiidae) and Philometra ophisterni sp. n. (Dracunculoidea: Philometridae) are described based on specimens recovered from the intestine and mesentery,

Cited by 12 publications

References 11 publications

Parsimony Analysis of Endemicity (PAE) of Mexican hydrological basins based on helminth parasites of freshwater fishes

Parsimony Analysis of Endemicity (PAE) of Mexican hydrological basins based on helminth parasites of freshwater fishes

Helminth parasites in freshwater fish from the Papaloapan river basin, Mexico

Two new species of Philometra (Nematoda: Philometridae) from needlefishes (Belonidae) in Iraq, with a key to Philometra spp. parasitic in the host\'s subcutaneous tissue, fins and musculature

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