Bathynellidae Grobben 1905

Family Bathynellidae Grobben, 1905 Diagnosis Diagnosis (translated from Grobben 1905: p. 456 by Drewes and Schminke 2011) when all species of Bathynellacea known at that time were included in a single family, Bathynellidae: body more Anisopoda-like, with eight free thoracic somites. Eyes absent. First antenna uniramous, with slender and unsegmented exopodite. Exopodites of thoracic limbs short, the seven anterior thoracic limbs with epipod. Abdominal appendages 2–5 absent. Sixth abdominal biramous appendages. Telson divided so that there is no tail fan. Type species: Bathynella natans from a well in Prague (Czech Republic). Diagnosis (translated from Serban et al. 1972) after the erection of three families (Bathynellidae, Parabathynellidae, and Leptobathynellidae) within the order Bathynellacea: Bathynellacea with paragnathes and exopod on antenna, smooth-edged labrum, prehensile three-segmented mandibular palp; one-segmented exopod of thoracopods; one or two pairs of two-segmented pleopods.