Quadrigyrus torquatus cystacants Van Cleave, 1920 (Acanthocephala: Quadrigyridae) parasitizing species of Astyanax (Characiformes: Characidae) from southern Brazil
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چکیده
منابع مشابه
A new species of Astyanax from headwater streams of southern Brazil (Characiformes: Characidae).
Astyanax pirabitira, new species, is described from the upper portion of the rio das Antas, laguna dos Patos system, and from the rio Pelotas, upper rio Uruguay drainage, Rio Grande do Sul State, Brazil. The new species belongs to the A. scabripinnis species complex and differs from its congeners by a combination of characters, viz., body depth (27.1-34.0% of standard length), narrow interorbit...
متن کاملAstyanax douradilho, a new characid fish from the rio Tramandaí system, southern Brazil (Characiformes: Characidae).
Astyanax douradilho, new species, is described from the rio Tramandaí system, coastal drainage of Rio Grande do Sul State, Brazil. The new species is distinguished from its congeners by possessing 37-39 perforated scales along the lateral line, 3-5 maxillary tricuspid teeth, 22-24 branched anal-fin rays, absence of a conspicuous dark stripe from humeral region to caudal peduncle, two vertically...
متن کاملTwo new species of Astyanax (Ostariophysi: Characiformes: Characidae) from eastern Brazil, with a synopsis of the Astyanax scabripinnis species complex
Two new species of Astyanax are described from eastern Brazil: A. microschemos from the córrego Palmital, rio Itapemirim drainage, Espírito Santo, and A. pelecus from the rio Pardo drainage, Bahia. Astyanax microschemos differs from its congeners by its shallower body depth, 26.9-29.7% of standard length, the presence of one vertically elongate humeral spot that extend above and below the later...
متن کاملCytogenetic divergence in two sympatric fish species of the genus Astyanax Baird and Girard, 1854 (Characiformes, Characidae) from northeastern Brazil
The fish genus Astyanax is widespread throughout the Neotropical region and is one of the most species-rich genera of the Characiformes. Cytogenetic studies of Astyanax have revealed marked intra- and interspecific diversity, with the identification of various species complexes. In this report, we describe the karyotypic structure of two sympatric species of Astyanax (Astyanax sp. and Astyanax ...
متن کاملTwo New Species of the Genus Pallisentis Van Cleave, 1928 (Acanthocephala: Quadrigyridae) from the Intestine of Channa punctatus (Bloch, 1793) from the River Gomti at Lucknow, India
BACKGROUND Acanthocephalans are fish parasites of worldwide distribution, penetrate their thorny proboscis into the intestinal wall of host and absorb nutrients. No diagnostic tool is available except postmortem investigations and identification by parasitologists. The aim of present study was to explore and assign taxonomical status to Pallisentis species prevalent in food fishes of river Gomt...
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ژورنال
عنوان ژورنال: Biota Neotropica
سال: 2019
ISSN: 1676-0611
DOI: 10.1590/1676-0611-bn-2018-0693