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New species of the genus Diarthrodes Thomson, 1882 (Copepoda: Harpacticoida: Thalestridae) from Vietnam and North-western Mexico

Abstract:

Some specimens of the family Thalestridae (Copepoda: Harpacticoida) were gathered from sediment samples taken in be framework of two short term studies about the effects of organic enrichment on the diversity of benthic copepods from two brackish coastal systems in central (Ensenada del Pabellón lagoon) and southern (Urías system) Sinaloa during the early 1990's and during 2005. Also some specimens of the same family were found in sediment samples taken in year 2004 during a study about the distribution and biogeography of harpacticoid copepods from Southern Vietnam. The specimens collected turned out to belong to five new species of Diarthrodes: D. imitator sp. nov., D. tripartitus sp. nov., D. hexasetosus sp. nov., D. nhatrangensis sp. nov. and D. savinkinii sp. nov. Seven species groups (I (1-2-2),II (1-2-3), III (2-1-3), IV (3-1-3), V (2-2-3), VI (3-2-2), VII (3-2-3)) are herein defined based on the number of segments of the exopod of the antenna, and on the number of segments of the exopod and endopod of the first swimming leg. Another new species attributed to group I (1-2-2), Diarthrodes apostolovii sp. nov., is created based on previous illustrations of D. assimilis from the Black Sea.