Folia Parasitologica, vol. 56 (2009), issue 1

Folia Parasitologica 56[1] 37-40 (2009) | 10.14411/fp.2009.007

A new species of Paracapillaroides (Nematoda: Capillariidae) parasitizing Nemadactylus bergi (Perciformes: Latridae) from the Argentine Sea

María Alejandra Rossin, Juan Tomás Timi
Laboratorio de Parasitología, Departamento de Biología, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata - Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Funes 3350, (7600) Mar del Plata, Argentina

A new nematode species, Paracapillaroides acanthocotylus sp. n., is described from the marine fish Nemadactylus bergi (Norman) (Latridae, Perciformes) from waters off Mar del Plata, Argentina (38°08'S, 57°32'W) (prevalence 81.8%, mean intensity 12.4 ± 10.3). The new species is readily distinguished from P. agonostomi Moravec, Salgado-Maldonado et Caspeta-Mandujano, 1999, the only known species of the genus, by having in both sexes a longer oesophagus in relation to total body length. Males of the new species have a shorter and more complex spicule and a markedly different morphology of the spicular sheath; the rays supporting the caudal bursa are also shorter and rounded, instead of digitiform. Furthermore, females of the new species have elevated vulval lips and longer eggs. The complex structure of both the spicule and spicular sheath is unique among all capillariids parasitizing cold-blooded vertebrates. This is the first record of a species of Paracapillaroides in the southwestern Atlantic Ocean.

Keywords: parasitic nematodes, Paracapillaroides, new species, marine fish, Argentine Sea

Received: August 14, 2008; Accepted: September 23, 2008; Published: March 1, 2009


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