title: A new species of Parspina Pearse, 1920 (Digenea: Cryptogonimidae) from Pimelodella gracilis (Valenciennes) (Siluriformes: Heptapteridae) in the Paraná River basin, Argentina, and a key to the genus.
abstract: A new species of cryptogonimid belonging to the genus Parspina Pearse, 1920 is described from the intestine of Pimelodella gracilis (Valenciennes) in the Paraná River basin, Argentina. Parspina pimelodellae n. sp. is characterised by having: (i) a body length/width ratio of 1:3.6-5.3 at the level of the ventral sucker; (ii) 21 oral spines; (iii) an oral sucker larger than the ventral sucker, with a sucker width ratio of 1:0.6-0.7; (iv) a postcaecal region of 16-19% of the body-length; (v) a compact, transversely elongate ovary, anterior to and well separated from the testes; (vi) small, branched vitelline follicles, extending from the level of the ventral sucker to the anterior margin of the ovary; and (vii) a large seminal vesicle situated posterodorsal to the ventral sucker. A key to the species of Parspina is presented.
authors.affiliation: Laboratorio de Helmintología, Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Universidad de Buenos Aires, Int. Güiraldes 2160, Pabellón II, 4º Piso, C1428EGA, Buenos Aires, Argentina. arredondonj@bg.fcen.uba.ar
authors.forename: Nathalia J
authors.initials: NJ
authors.lastname: Arredondo
authors.forename: Margarita C Ostrowski
authors.initials: MC
authors.lastname: de Núñez
mesh_terms: D000818:Animals; D001118:Argentina; D002397:Catfishes / Q000469:parasitology*; D045483:Rivers; D013045:Species Specificity; D014200:Trematoda / Q000033:anatomy & histology / Q000145:classification*