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Gastric coccidiosis in Thoracocharax stellatus caused by Goussia guamaensis n. sp. (Apicomplexa: Eimeriidae) from the Amazon region
Author(s) -
Silva Marcelo F.,
Araújo Rebeca S.,
Silva Diehgo T.,
Sanches Osimar,
Hamoy Igor,
Matos Edilson
Publication year - 2019
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1111/jfd.12992
Subject(s) - biology , apicomplexa , eimeriidae , amazon basin , genus , zoology , schizogony , coccidiosis , phylogenetic tree , botany , ecology , amazon rainforest , veterinary medicine , protozoal disease , genetics , plasmodium falciparum , malaria , immunology , medicine , gene
Ninety‐seven specimens of spotfin hatchetfish, Thoracocharax stellatus , an ornamental freshwater species from the Amazon basin, were captured in the basin of the Guamá River in the municipality of Belém, in northern Brazil, and analysed for coccidiosis infection. Overall, 26 of the specimens were infected by apicomplexan parasites of the genus Goussia , with unsporulated forms being found in the gastric epithelium and sporulated forms in the intestinal lumen. The spheroid oocysts (mean diameter: 13.2 ± 1.7 μm) have four elliptical sporocysts. A partial sequence of the SSU rDNA of the new species was obtained, which contained 1,121 base pairs, with 43.8% guanine + cytosine (G + C), and the bases distributed as follows: A = 28.1%, C = 18.3%, G = 25.5% and T = 28.1%. The combined analysis of the morphometric and phylogenetic evidence confirmed that the specimens represented the genus Goussia and were allocated to a new species, Goussia guamaensis n. sp., which is described here.