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3 resultados encontrados para: TEMA: Ictalurus furcatus
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1.
- Artículo con arbitraje
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Redescription of three species of nematodes (Nematoda) parasitising fishes in the USA, with a key to the species of Dichelyne Jägerskiöld, 1902 parasitic in freshwater and brackish-water fishes of North America
Moravec, František (autor) ; de Buron, Isaure (autora) ; González Solís, David (autor) ;
Contenido en: Systematic Parasitology Vol. 96, no. 1 (January 2019), p. 79-94 ISSN: 0165-5752
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Resumen en: Inglés |
Resumen en inglés

Three species of parasitic nematodes are redescribed based on light and scanning electron microscopical (SEM) examinations of newly collected specimens in fishes of South Carolina, USA: Dichelyne (Cucullanellus) bullocki Stromberg & Crites, 1972 from Fundulus heteroclitus (Linnaeus) (Fundulidae); Dichelyne (Dichelyne) diplocaecum Chandler, 1935 from Ictalurus furcatus (Valenciennes) (Ictaluridae); and Hysterothylacium pelagicum Deardorff & Overstreet, 1982 from Coryphaena hippurus Linnaeus (Coryphaenidae). For the first time, intraspecific variations in the number of intestinal caeca were observed in D. bullocki, as well as previously unknown males and gravid females of D. diplocaecum are described; this enabled to synonymise D. mexicanus Caspeta-Mandujano, Moravec & Salgado-Maldonado, 1999 with D. diplocaecum. Unlike most congeneric species, H. pelagicum has no double postanal papillae, as confirmed by SEM. A key to the species of Dichelyne Jägerskiöld, 1902 parasitic in freshwater and brackish-water fishes in North America is provided.


2.
- Artículo con arbitraje
Taxonomic discrimination and identification of extant blue catfishes (Siluriformes: Ictaluridae: Ictalurus furcatus group)
Rodiles Hernández, María del Rocío (1956-) ; Lundberg, John G. (coaut.) ; Sullivan, John P. (coaut.) ;
Contenido en: Proceedings of the Academy of Natural Sciences of Philadelphia Vol 159, no. 1 (October 2010), p. 67-82 ISSN: 0097-3157
Resumen en español

Se reconocen tres especies del grupo Ictalurus furcatus (género Ictalurus): I. furcatus, I. meridionalis e I. balsanus. Los caracteres diagnósticos de estas especies se encuentran en los huesos del esqueleto, en el conteo de vértebras y radios anales, en la morfometría y en la coloración. Ictalurus balsanus tiene un proceso más corto en el supraoccipital, en la placa anterior de la nuca y en el poscleitro; presenta escasas ornamentaciones en la espina de la aleta pectoral y un alargado proceso posterior del premaxilar. Ictalurus furcatus e I. meridionalis son especies muy similares pero se distinguen claramente por la ornamentación de la espina de la aleta pectoral, por la forma y textura del proceso supraoccipital y la forma del proceso postcleitral; así como, por el número de vértebras y radios anales y por la longitud de la aleta anal y del pedúnculo caudal. Las tres especies también presentan diferencias en la talla máxima y en la coloración del cuerpo. Los resultados del análisis del ADN mitocondrial (12S y 16S), de una muestra limitada, son compatibles con los resultados morfológicos: I. meridionalis es una especie distinta de I. furcatus; I. balsanus es la especie más divergente de las tres. I. furcatus e I. meridionalis presentan variaciones, entre cuencas hidrográficas, en cuanto al número de vértebras y radios de la aleta anal.

Resumen en inglés

Three species of the Ictalurus furcatus Group (genus Ictalurus) are recognized: I. furcatus, I. meridionalis and I. balsanus. These species are differentially diagnosed by characters of the bony skeleton, fin-ray and vertebral counts, morphometrics and coloration. Ictalurus balsanus is distinctive in having a relatively short supraoccipital process, anterior nuchal plate and posterior cleithral process, weakly developed pectoral-fin spine ornamentation, and an elongated posterolateral premaxillary process. Ictalurus furcatus and I. meridionalis are closely similar species but are clearly distinguished by features of the pectoral-fin spine ornamentation, supraoccipital process shape and texture, posterior cleithral process shape, numbers of anal-fin rays and vertebrae, and related proportional measurements of anal-fin and caudal peduncle length. Apparent differences among the three species in maximum size and coloration are also noted. A limited sample of molecular sequence data from the 12S/16S mitochondrial DNA loci is consistent with morphology-based results indicating that I. meridionalis is a species distinct from I. furcatus, and that I. balsanus is the most divergent species of the three. Ictalurus furcatus and I. meridionalis exhibit interriver basin variation in numbers of vertebrae and anal-fin rays.


3.
Artículo
Resumen en: Inglés |
Resumen en inglés

Two little-known species of Spinitectus (Nematoda: Cystidicolidae) were, for the first time, recorded from fishes of the Lacantún River (Usumacinta River basin) in the Lacandon rain forest, Chiapas, southern Mexico: S. tabascoensis Moravec, Garcia-Magaña et Salgado-Maldonado, 2002 in intestines of Ictalurus furcatus (Valenciennes) (Ictaluridae) (adults and juveniles), Cathorops aguadulce (Meek) and Potamarius nelsoni (Evermann et Goldsborough) (both Ariidae) (in both only juveniles), and S. osorioi Choudhury et Pérez-Ponce de León, 2001 in Atherinella alvarezi (Díaz-Pardo) (Atherinopsidae) (adults in intestine) and Eugerres mexicanus (Steindachner) (Gerreidae) (adults and juveniles in stomach). Eugerres mexicanus, C. aguadulce and P. nelsoni represent new host records. Detailed light and electron microscopical studies of S. tabascoensis revealed some taxonomically important, previously not observed features, such as cuticular spines arranged in four sectors, the cephalic structure, the number (2) of ventral precloacal ridges or the structure of the male caudal end. Therefore, Spinitectus tabascoensis is redescribed. Spinitectus macrospinosus Choudhury et Perryman, 2003, described from ictalurids in Canada and the USA, is considered its junior synonym. Spinitectus tabascoensis seems to be a specific parasite of Ictalurus spp., whereas C. aguadulce and P. nelsoni, as well as some other fishes, serve only as its paratenic hosts. The definitive hosts of S. osorioi are atherinopsid fish (A. alvarezi, Chirostoma spp.), whereas the gerreid E. mexicanus probably serves only as its postcyclic host.