Bathynellidae Grobben 1905

Key to subfamilies 1a. AI with six or seven articles; AII with five to seven articles; labrum smooth; sexual dimorphism present or absent on mandibular palp and/or thoracopods; mandibular palp with one or two claws; MxI with three plumose setae on lateral side; MxII four-segmented; basipod of thoracopod I almost rectangular; exopod inserted distally on basipod; ThI with fourth endopodal article small; uropod with three or four exopodal setae (Fig. 18B, D, H–J); uropod with exopod <endopod; furcal rami with five spines (Fig. 19) 2 1b. AI with seven articles; AII with eight articles (Fig. 9B); labrum with teeth (Fig. 9C); no sexual dimorphism in mandibular palp or thoracopods; three claws on mandibular palp (Fig. 9E, F); MxI with two smooth setae laterally (Fig. 9K); MxII three-segmented (Fig. 9L); basipod of ThI trapezoidal (Fig. 10A); exopod of ThI inserted medially on basipod; ThI with fourth endopodal article long; male ThVIII with endopod = exopod (Fig. 11A, B); uropod with six exopodal setae (Fig. 11D); uropod with exopod = endopod (Fig. 11D); furcal rami with three spines (Fig. 11E)......................................................... .................................................................................................................................................. Queenslandbathynellinae subfam. nov. 2a. AI with six or seven articles; AII with five to seven articles; mandibular palp with one to three articles and one or two claws; sexual dimorphism present or absent in mandibular palp and/or in thoracopods; thoracopods with three or four endopodal articles; female ThVIII with protopod and two branches; male ThVIII with exopod like the exopod of thoracopods (Fig. 17F–H); male ThVIII with endopod <exopod; pleopod II present or absent ............................................................................... 3 2b. AI with seven articles; AII with seven articles (Fig. 12F); mandibular palp with three articles (Fig. 13M) and two claws; sexual dimorphism absent in mandibular palp or thoracopods; thoracopods with four endopodal articles (Figs 14H, 15E); female ThVIII with protopod and one branch; male ThVIII with exopod not like exopod of thoracopods (Fig. 17J); male ThVIII with exopod = endopod; pleopod II absent; uropod with special seta (‘X’) on endopod (Fig. 18F) .............................. ...................................................................................................................................................................................... Austrobathynellinae 3a. Mandibular palp with one to three articles (Fig. 13I, J, N)and one or two claws; mandibular palp with sexual dimorphism thoracopods with three or four endopodal articles (Figs 14A, B, 15A, B); thoracopods with no sexual dimorphism; female ThVIII with epipod present or absent; pleopod II always absent; sympod of the uropod with maximum four spines (Fig. 18B, C)........................................................................................................................................................................... Gallobathynellinae 3b. Mandibular palp always with three articles and two claws (Fig. 13K, L); thoracopods always with four endopodal articles (Figs 14C, F, I, 15C, D, F); sexual dimorphism present or absent in thoracopods and rarely on the mandibular palp; female ThVIII epipod always present; pleopod II present or absent; sympod of the uropod with more than four spines (Fig. 18D, E) ................................................................................................................................................................................................... Bathynellinae