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image of Crustaceana

A limnological survey carried out during January 1998 in the state of Tabasco, southeastern Mexico, established the occurrence of the Eurasian freshwater copepod Thermocyclops crassus (Fischer, 1853) at several sites. This species can be distinguished from the morphologically close T. decipiens (Kiefer, 1929) by its seminal receptacle, with a clear “T” shape, female genital somite length/width ratio exceeding 1.2, furcal length/width ratio below 2.5, and the ornamentation on the connecting lamellae of legs 1 and 4. The introduction of this eurytopic species in freshwater systems of Tabasco is probably related to aquacultural activities. This record increases the number of species of Thermocyclops known in Mexico, and is the first documented record of an introduced freshwater copepod species in this country. A key for the identification of the species known in Mexico and Central America is presented. A partir de un estudio limnológico efectuado durante enero 1998 en el estado de Tabasco, sureste de México, se registra la presencia del copépodo euroasiático de aguas continentales Thermocyclops crassus (Fischer, 1853) que fue encontrado en varias localidades. Esta especie puede ser distinguida de T. decipiens (Kiefer, 1929), que es una especie morfológicamente cercana, por su receptáculo seminal, que claramente tiene una forma de “T”, una proporción largo/ancho por encima de 1.2 en el somita genital de la hembra, relación longitud/ancho de la furca inferior a 2.5, también difiere en la ornamentación de la lamela conectora de las patas 1 y 4. La introducción de esta especie euritópica en aguas continentales de Tabasco está relacionada, probablemente, con las actividades acuaculturales. Este registro incrementa el número de especies de Thermocyclops conocidas en México, y es el primer registro documentado de la introducción de un copépodo de aguas dulces en el país. Se proporciona una clave para la identificación de las especies conocidas en México y América Central.

Affiliations: 1: El Colegio de la Frontera Sur, Unidad Chetumal, Apdo. Postal 424, Chetumal, Quintana Roo 77000, Mexico


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