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image of Crustaceana

The known distribution of Mesocyclops aspericornis in the Americas included the central and northern areas of South America and the insular Caribbean. It had not been collected before in continental North America. The analysis of samples collected in a pond in the state of Sinaloa, on the Pacific coast of Mexico, yielded female individuals of this species. The Mexican individuals tended to be smaller than the African females (1.14-1.20 mm vs 1.3-1.5 mm), but the morphology of the Mexican specimens is identical in most characters to that described or depicted in previous works. This is the first morphological study of this species aided with SEM; it includes detailed data on several microstructures, some of which undescribed previously. It also is the first report of its effective occurrence in Mexico. All previous records of this species in the Americas are related to the Atlantic coasts. This record, in the Mexican Pacific area, suggests that this supposedly introduced Afro-Asian species had an alternative route of dispersion from the Pacific coast. This is also the second documented record of an introduced freshwater copepod in Mexico.

La distribución conocida de Mesocyclops aspericornis en el continente americano incluía las areas sur y central de América del Sur y del Caribe insular. No había sido recolectada antes en América del Norte. El análisis de muestras recolectadas en un estanque en el estado de Sinaloa, costa pacífica de México, produjo la identificación de hembras de esta especie. Las hembras recolectadas en México tiended a ser de menor talla que las africanas (1.14-1.20 mm vs 1.3-1.5 mm); sin embargo, la morfología de los especímenes mexicanos es idéntica en prácticamente todos los caracteres a las descripciones previas. Este es, sin embargo, el primer estudio morfológico auxiliado por microscopía electrónica de barrido (MEB); incluye datos detallados sobre varias microestructuras, algunas previamente indescritas. Este es el primer registro efectivo de la presencia de esta especie en México; todos los registros anteriores estaban relacionados con las costas del Océano Atlántico. Este registro en el área del Pacífico Mexicano sugiere que esta especie Afro-asiática supuestamente introducida tuvo una vía alternativa de dispersión a partir de la costa del Pacífico Tropical Oriental. Este es, además, el segundo registro documentado de una especie de copépodo dulceacuícola introducida en México.


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