title: Henneguya nagelii n. sp. (Myxozoa: Myxobolidae) in Cyphocharax nagelii (Steindachner, 1881) (Teleostei: Characiformes: Curimatidae) from the Peixe's River, São Paulo State, Brazil.
abstract: A new species of Myxosporea, Henneguya nagelii n. sp., is described parasitizing the gills of Cyphocharax nagelii collected from Peixe's River, São Paulo State, Brazil. Among the fish examined, 16.7% had gills parasitized by myxosporeans. The plasmodia were white, round, or oval and measured 150-250 μm. The mature spores were fusiform and had smooth wall. The spores measurements were the following: total length, 34.5 ± 4.2 (26.4-39.9) μm; body length, 12.0 ± 0.5 (11.2-11.9) μm; body width, 4.9 ± 0.3 (4.4-5.5) μm; and caudal process length, 22.4 ± 4.0 (14.7-27.3) μm. The polar capsules were elongated and of unequal size, with lengths of 4.9 ± 0.4 (4.0-5.9) μm and 5.2 ± 0.4 (4.6-6.0) μm for the longest and shortest axes, respectively. Capsule width was 1.8 ± 0.2 (1.5-2.2) μm. Each capsule contained a polar filament with six to eight turns. There was no mucous envelope or iodinophilous vacuole. Morphometric differences between this parasite and other species of the genus Henneguya indicated that the parasite observed in C. nagelii is a new species. This is the first species of Myxosporea described in Peixe's River.
authors.affiliation: Instituto de Biociências, Departamento de Parasitologia, UNESP-Universidade Estadual Paulista, Campus de Botucatu, Botucatu, São Paulo, Brazil, azevedork@hotmail.com.
authors.forename: Rodney Kozlowiski
authors.initials: RK
authors.lastname: de Azevedo
authors.forename: Vanessa Doro
authors.initials: VD
authors.lastname: Abdallah
authors.forename: Jaciara Vanessa Krüger
authors.initials: JV
authors.lastname: Paes
authors.forename: Reinaldo José
authors.initials: RJ
authors.lastname: Da Silva
authors.forename: Patrícia
authors.initials: P
authors.lastname: Matos
authors.forename: Michele
authors.initials: M
authors.lastname: Velasco
authors.forename: Edilson
authors.initials: E
authors.lastname: Matos
mesh_terms: D000818:Animals; D001938:Brazil / Q000453:epidemiology; D060125:Characiformes; D005393:Fish Diseases / Q000453:epidemiology / Q000469:parasitology*; D005880:Gills / Q000469:parasitology; D055764:Myxozoa / Q000033:anatomy & histology / Q000145:classification*; D045483:Rivers
references.citation: Parasite. 2005 Sep;12(3):221-7
references.pmid: 16218209
references.citation: Parasitology. 2003 Apr;126(Pt 4):313-9
references.pmid: 12741510
references.citation: Dis Aquat Organ. 2011 Feb 22;93(3):235-42
references.pmid: 21516976
references.citation: J Eukaryot Microbiol. 1995 Sep-Oct;42(5):515-8
references.pmid: 7581326
references.citation: Mem Inst Oswaldo Cruz. 2003 Sep;98(6):761-5
references.pmid: 14595452
references.citation: Syst Parasitol. 2002 May;52(1):43-54
references.pmid: 12023561
references.citation: Vet Parasitol. 2009 Dec 3;166(1-2):52-9
references.pmid: 19695782
references.citation: Dis Aquat Organ. 2006 Mar 2;68(3):219-26
references.pmid: 16610587
references.citation: Vet Parasitol. 2006 Apr 30;137(3-4):253-61
references.pmid: 16540251