Bathycopea

Shimomura, Michitaka, 2008, Bathycopea (Isopoda: Sphaeromatidea: Ancinidae) from Japan, with descriptions of two new species and redescription of B. parallela Birstein, Zootaxa 1678, pp. 25-49 : 26

Key to species of Bathycopea

1. Pereonites 1–5 increasing in width posteriorly............................................................................................ 2

- Pereonites 1–5 subequal in width .................................................................................. B. parallela Birstein

2. Uropods having large serrations on lateral margin .......................................................... B. ivanovi Birstein

- Uropods smooth on lateral margin, without large serrations....................................................................... 3

3. Ommatidia and pigments of eyes present.................................................................................................... 4

- Ommatidia and pigments of eyes absent ..................................................................................................... 5

4. Pleotelson abruptly decreasing in width; uropod about 5.4 times as long as width, without short tooth medial-distally .......................................................................................... B. daltonae (Menzies & Barnard)

- Pleotelson gradually decreasing in width; uropod 4–4.7 times as long as width, with short tooth medial- distally ............................................................................................................................... B. oculata sp. nov.

5. Pleotelson with double carina dorsally; merus and carpus of male pereopod 2 longer than ischium ........... ........................................................................................................................................ B. dicarina sp. nov.

- Pleotelson with single carina dorsally; merus and carpus of male pereopod 2 shorter than ischium............ ..................................................................................................................................... B. typhlops Tattersall