
Specimens of the genus Tisbella Gurney, 1927 were found during a series of sampling campaigns in 2 brackish systems in southern Sinaloa (north-western Mexico). The specimens were identified as Tisbella pulchella (Wilson, 1932), a species of harpacticoid copepod originally described from material collected from the Woods Hole region (USA) and found also in the Bermuda Islands. A thorough comparison between the material collected in Mexican coastal systems in the eastern tropical Pacific and previous redescriptions of the type material is presented. It is shown that the only differences between the most accurate and detailed redescription available and the present description is in the number of setae of the arthrite and palp of the maxillule, and in the number of accessory setae of the maxilliped. Some notes on the biogeography of the species are presented and it is concluded that T. pulchella is the most widely distributed species within the genus.Se encontraron ejemplares del género Tisbella Gurney, 1927 durante una serie de muestreos de meiofauna en 2 sistemas costeros del sur de Sinaloa (noroeste de México). Los organismos fueron identificados como Tisbella pulchella (Wilson, 1932), una especie de copépodo harpacticoide originalmente descrita a partir de material recolectado en la región de Woods Hole (EUA) y también registrada en las islas Bermuda. Se presenta una comparación de los especímenes recolectados en sistemas costeros mexicanos del Pacífico tropical este y las redescripciones disponibles del material tipo. Se observó que las únicas diferencias observadas entre la redescripción más detallada de la especie y la presente descripción es el número de setas del artrito y palpo de la maxíllula y el número de setas accesorias del maxilípedo. Finalmente se dan algunas notas acerca de su biogeografía y se concluye que T. pulchella es la especie con la distribución más amplia del género.
Copepoda, taxonomy, QH301-705.5, Harpacticoida, noroeste de México, Biology (General), taxonomía, Tisbella, north-western Mexico
Copepoda, taxonomy, QH301-705.5, Harpacticoida, noroeste de México, Biology (General), taxonomía, Tisbella, north-western Mexico
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