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image of Crustaceana

The distributional and taxonomic status of the copepod genus Mesocyclops G. O. Sars, 1914, known from tropical America, is revised. Currently, the main characters to recognize species (i.e., presence/absence of a spine on the basipodite of the first trunk limb, the presence/absence of teethlike projections on the intercoxal sclerite of the fourth trunk limb, and the shape of the seminal receptacle) have not been strong enough to make a clear, confident taxonomic border between morphologically similar species. This is most evident in species belonging to the M. thermocyclopoides, the M. meridianus-brasilianus, and the M. reidae-ellipticus groups. Although some species qualify as Pantropical, Neotropical, endemic, and transitional forms, it is necessary to increase collection efforts and evaluate other morphological features in order to establish the taxonomic limits within these intrincate species groups as well as to determine the real distributional range of each.

Se revisa el estado de conocimiento taxonómico y distribución de las especies de Mesocyclops G. O. Sars, 1914 conocidas en América tropical. Actualmente, las características morfológicas para diferenciar entre especies (vg. presencia/ausencia de una espina sobre el basipodito de la primera pata torácica, presencia/ausencia de proyecciones con forma de diente sobre el esclerito intercoxal de la cuarta pata torácica y la forma del receptáculo seminal), no han sido suficientes para marcar un límite taxonómico confiable entre especies morfológicamente similares. Esto es más evidente en las especies que pertenecen a los grupos M. thermocyclopoides, M. meridianus-brasilianus y M. reidae-ellipticus. Por otro lado, aunque algunas especies son calificadas como formas Pantrópicas, Neotrópicas, endémicas y de transición, es necesario incrementar los esfuerzos de colecta y evaluar otras características morfológicas con el fin de establecer límites taxonómicos más claros dentro de los grupos de especies antes señalados, así como determinar los ámbitos reales de distribución de cada una.

Affiliations: 1: El Colegio de la Frontera Sur, Unidad Chetumal, Km 2 Carretera Chetumal-Bacalar, Zona Industrial # 2, Chetumal, 77000 Quintana Roo, Mexico; 2: El Colegio de la Frontera Sur, Unidad Chetumal, Km 2 Carretera Chetumal-Bacalar, Zona Industrial # 2, Chetumal, 77000 Quintana Roo, Mexico


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