Abstract
A new species of Bathynellidae Grobben, 1905 is described from Spain. Vejdovskybathy-nella vasconica sp. nov. displays an exclusive feature within the genus: eightsegmented antenna. Besides, the new species has a unique combination of morphological characters, including medial seta on exopod of antenna, antennule length similar to antenna, three-segmented mandibular palp without sexual dimorphism, four segments on endopod of thoracopod I to VII, three spines on the sympod of uropod, two claws on the endopod of uropod, first spine longer than the rest on the furcal rami, exopod smaller than endopod on female thoracopod VIII, a long frontal projection and medium size outer protuberance on penial region of male thoracopod VIII, and a medium size frontal crest with a small “spur” on basipod of male thoracopod VIII. Partial sequences from mitochondrial gene cytochrome oxidase I (COI) and 18S ribosomal RNA (rRNA) gene have been obtained from specimens of the type locality of the new species. The analyses of molecular data demonstrate the presence of two highly divergent genetic units within the Bathynellidae, corresponding to two morphologically well differenciated genera.
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