Prionocrangon, Wood-Mason and Alcock, 1891

Kim, Jung Nyun & Chan, Tin-Yam, 2005, A revision of the genus Prionocrangon (Crustacea: Decapoda: Caridea: Crangonidae), Journal of Natural History 39 (19), pp. 1597-1625 : 1601

Key to species of Prionocrangon

1. Eyestalks drawn out to bluntly cylindrical or villiform extremities..... 2

– Eyestalks triangular.................. 5

2. Dactyli of fourth and fifth pereopods 0.70–0.74 times as long as propodi... 3

– Dactyli of fourth and fifth pereopods 0.32–0.42 times as long as propodi... 4

3. Rostrum relatively longer, extending to tip of branchiostegal spine and 0.20 times as long as carapace; posterior margin of posterolateral process of sixth abdominal somite rounded and with deep excavation.... P. curvicaulis Yaldwyn, 1960

– Rostrum very short, extending only to tip of antennal spine and 0.07 times as long as carapace; posterior margin of posterolateral process of sixth abdominal somite truncate and without excavation.......... P. formosa sp. nov.

4. Fourth abdominal somite with low median carina; posterior margin of telson rounded, armed with 5–12 long spines; palm of first pereopod 3.70–4.55 times as long as wide; females with endopods of pereopods lacking proximolateral lobe................. P. dofleini Balss, 1913

– Fourth abdominal somite without median carina; posterior margin of telson truncate, armed with two pairs of long spines; palm of first pereopod 4.95–5.25 times as long as wide; females with endopods of second to fifth pleopods with proximolateral lobes.... P. ommatosteres Wood-Mason and Alcock, 1891

5. Carapace with four or five dorsal spines; posterior margin of telson rounded, armed with 10–13 long spines......... P. paucispina sp. nov.

– Carapace with six to eight dorsal spines; posterior margin of telson truncated, armed with two pairs of long spines.............. 6

6. Telson shorter than sixth abdominal somite and 0.44 times as long as carapace; posterior half of telson strongly convergent..... P. pectinata Faxon, 1896

– Telson longer than sixth abdominal somite and 0.64 times as long as carapace; posterior half of telson only slightly convergent..... P. demani sp. nov.