Halosbaena

Shimomura, Michitaka & Fujita, Yoshihisa, 2009, First record of the thermosbaenacean genus Halosbaena from Asia: H. daitoensis sp. nov. (Peracarida: Thermosbaenacea: Halosbaenidae) from an anchialine cave of Minamidaito-jima Is., in Okinawa, southern Japan, Zootaxa 1990, pp. 55-64 : 56

Key to the species of Halosbaena

1. Ocular scales: shape of mediodistal angle pointed; uropod: endopodite with 8 cuspidate macrosetae; segment 2 of exopodite with 11–12 plumose macrosetae .................................................................................................................. 2

- Ocular scales: shape of mediodistal angle rounded; uropod: endopodite with 4–6 cuspidate macrosetae; segment 2 of exopodite with 7–9 plumose macrosetae ...................................................................................................................... 3

2. Antenna 1: accessory flagellum 4–6 segmented; gnathopod; dorsal teasel macrosetae on baso-ischium absent; proximal simple macrosetae on baso-ischium present; telson about 0.9 times as width as length, with 3–5 dorsal serrate macrosetae ........................................................................................................................................ H. acanthura Stock

- Antenna 1: accessory flagellum 7–9 segmented; gnathopod; dorsal teasel macrosetae on baso-ischium present; proximal simple macrosetae on baso-ischium absent; telson about 0.7 times as width as length, without dorsal macrosetae .................................................................................................................................... H. fortunata Bowman & Iliffe

3. Antenna 1: main flagellum 7–9 segmented; pereiopods 2–5: exopodite segment 2 with 6 plumose macrosetae; uropod: exopodite segment 2 with 7 plumose macrosetae; telson about 0.9 times as width as length; male penial lobe distal portion slightly broadened, without projection on its base ..................................... H. tulki Poore & Humphreys

- Antenna 1: main flagellum 12–14 segmented; pereiopods 2–5: exopodite segment 2 with 8 plumose macrosetae; uropod: exopodite segment 2 with 9 plumose macrosetae; telson about 0.6 times as width as length; male penial lobe distally tapering, with a short projection on its base ..................................................................... H. daitoensis sp. nov.