Two new mermithidis (Nematoda: Mermithidae) parasites of Simulium wolffhuegeli Roubaud and S. jujuyense (Paterson & Shannon) (Diptera: Simuliidae) in Argentina

Abstract

Two new species of mermithids (Nematoda: Mermithidae), Gastromermis doloresi n. sp. a parasite of Simulium wolffhuegeli Roubaud and Hydromermis doloresi n. sp. a parasite of S. jujuyense (Paterson & Shannon) from Córdoba, Argentina, are described and illustrated. G. doloresi n. sp. is characterized by having medium sized, pear-shaped and oval amphids, eight hypodermal chords all around the body, cylindrical S-shaped vagina, single long spicule 528 [mi]m, whith teh sculpture tip, three rows of genital papillae in which the middle row contains 17 pre-anal and 9 post-anal papillae, and lateral rows contain 18 papillae. Hydromermis doloresi n. sp. can be distinghished by the following: medium sized, pear-shaped amphids, eight hypodermal chords, a cylindrical, S-shaped vagina, one short curved spicule with sculpture and genital papillae in three rows. The medium ventral row of papillae has 4 double and 9 single pre-anal papillae and 3 double and 6 single port-anal papillae, lateral rows have 18 single papillae each

The mermithid species Isomermis lairdi (Nematoda, Mermithidae), previously only known in Africa, found in Europe

“…Camino (1987) accepts as valid approximately 12 species of the genus, without listing them, and describes three new species (Camino 1987, 1994). Species of Isomermis have been reported from Europe (Coman 1961, Rubzov 1968, Rubzov and Doby 1970, Katyukha and Lukhovoz 2008), North America (Welch 1962, St-Onge and Charpentier 2008, St-Onge et al 2008), Central (Poinar and Takaoka 1979, 1981) and South America (Camino 1987, 1994, Ginarte et al 2003), Africa (Rubzov 1972, Mondet et al 1977, Maduabum and Iwuala 1990, Crainey et al 2009) and Asia (Poinar and Takaoka 1986). The host range of the genus includes different species of Simuliidae (Crosskey and Poinar 2002) and rarely Chironomidae (Rubzov 1968, Camino 1987).…”

“…The host larvae were kept in shallow dishes with tap water and were examined periodically for the emergence of postparasitic juveniles of mermithids (Rubzov 1974). Emerged nematodes were placed in Petri dishes with tap water and maintained in the cold (5–7 °C) (method after Camino 1994). The adults were fixed in 4% formaldehyde, transferred to glycerol (simple evaporation method, after Poinar 1975), and mounted on microscopic slides with paraffin rings.…”

“…Original descriptions of closely related (Welch 1962, Rubzov 1968) or later described species (Mondet et al 1977, Poinar and Takaoka 1979, 1981, 1986, Camino 1987, 1994) were also used. The conclusions concerning diagnostic characters in mermithid taxonomy, as suggested by Curran and Hominick (1981), were considered as well.…”

Biodiversidad De Mermítidos (Nematoda, Mermithidae) Parasitoides De Larvas De Dípteros Acuáticos (Simuliidae, Culicidae Y Chironomidae) en Argentina

“…Se han hallado en simúlidos dos especies del género Ditremamermis Camino & Poinar, 1988(Camino & Poinar, 1988Camino, 1998); ocho especies de Mesomermis Daday, 1911 (Camino, 1985a(Camino, , 1990(Camino, , 1991c(Camino, , 1994a; cuatro especies de Gastromermis Micoletzky, 1923 (Camino, 1985b, 1991a, 1993a; 2 de Octomyomermis Johnson, 1963 (Camino 1988(Camino , 1992; 2 de Isomermis Coman, 1953 (Camino, 1987(Camino, , 1994b; 2 de Limnomermis Daday, 1911Camino, 1998); 1 especie de Hydromermis Corti, 1902 (Camino, 1993b); y 1 de Bathymermis Daday, 1911 (Camino, 1993c) en diferentes localidades de la Argentina (Tabla 1). Como se observa en la tabla 2, la prevalencia varió de 3% a 18%.…”