title: Two new species of Cryptocephalum n. gen. (Monogenoidea: Dactylogyridae) from the cephalic lateral line of Percichthys trucha (Perciformes: Percichthyidae) in Patagonia, Argentina.
abstract: Two new species of Monogenoidea were found parasitizing the cephalic lateral line canals of Percichthys trucha (Valenciennes) (Perciformes: Percichthyidae). These species are described as members of a newly proposed genus of Dactylogyridae. Cryptocephalum n. gen. is characterized by the site of infection and the combination of the several features: ventral and dorsal anchor/bar complexes, anchors with strongly elongated shaft and recurved point, shaft and point of dorsal anchors protruding laterally from haptor, hooks with 2 subunits and with pair 5 smaller than the others; gonads overlapping; coiled male copulatory organ with counterclockwise rings, accessory piece formed by 2 distinct parts, and a tubular, sclerotized ventral vagina. C ryptocephalum petreum n. sp. is characterized by having both anchor pairs protruding laterally from haptor, male copulatory organ with a coil of 2-1/2 rings, accessory piece tweezers-shaped, and sclerotized vaginal vestibule. Cryptocephalum spiralis n. sp. has ventral anchors protruding ventrally and dorsal ones protruding laterally, male copulatory organ with a coil of 1-1/2 rings, the antero-dorsal part of the accessory piece saddle-shaped, vaginal vestibule not present, and coiled vagina. This is the first record of Dactylogyridae species parasitizing the cephalic lateral line of fishes.
authors.affiliation: Laboratorio de Parasitología, INIBIOMA (CONICET-UNCo), Quintral 1250 (8400), Bariloche, Río Negro, Argentina. rvega@conicet-comahue.gob.ar
authors.forename: Rocío M
authors.initials: RM
authors.lastname: Vega
authors.forename: Gustavo P
authors.initials: GP
authors.lastname: Viozzi
authors.forename: Norma L
authors.initials: NL
authors.lastname: Brugni
mesh_terms: D000818:Animals; D001118:Argentina / Q000453:epidemiology; D005393:Fish Diseases / Q000453:epidemiology / Q000469:parasitology*; D005618:Fresh Water; D053403:Lateral Line System / Q000469:parasitology*; D010473:Perciformes / Q000469:parasitology*; D010986:Platyhelminths / Q000033:anatomy & histology / Q000145:classification*; D015995:Prevalence; D014201:Trematode Infections / Q000453:epidemiology / Q000469:parasitology / Q000662:veterinary*