POLYCHELIDAE, , Galil, 2000

Ahyong, Shane T. & Chan, Tin-Yam, 2004, Polychelid Lobsters Of Taiwan (Decapoda: Polychelidae), Raffles Bulletin of Zoology 52 (1), pp. 171-182 : 181

KEY TO THE POLYCHELIDAE OF TAIWAN

1. Epipod of maxilliped 3 longer than ischium. Carapace without submedian cervical spines (i.e., the pair of spines at the anterior end of the median postcervical carina). Posterolateral margins of the carapace distinctly convex .............. Pentacheles laevis

– Epipod of maxilliped 3 vestigial, less than one-third ischium length. Carapace with submedian cervical spines. Posterolateral margins of the carapace nearly straight Polycheles spp. ................................................................................................. 2

2. One rostral spine. Dorsal orbital sinus subdivided into two by interlocking spines lining the margins of the orbit P. typhlops

– Two rostral spines. Dorsal orbital sinus not subdivided ....... 3

3. Dorsal orbital sinus V-shaped. Posterior division of lateral margin of carapace with 12 or more spines .......................... 4

– Dorsal orbital sinus U-shaped. Posterior division of lateral margin of carapace with fewer than 11 spines ..................... 5

4. Outer margin of dorsal orbit spinose. Branchial carina coarsely tuberculate. Dorsum of abdomen tuberculate ....... P. coccifer

– Outer margin of dorsal orbit unarmed. Branchial carina obsolete, unarmed. Dorsum of abdomen smooth, not tuberculate ................................................................................ P. amemiyai

5. Median carina on abdominal tergite 5 without antrorse spine ................................................................................................... 6

– Median carina on abdominal tergite 5 with antrorse spine .... 7

6. Second abdominal pleuron without anterior spine. Posterior margin of cervical groove with 3-4 spinules between midline and branchial carina .......................................... P. auriculatus

– Second abdominal pleuron with one or more anterior spines. Posterior margin of cervical groove with 1 spinule between midline and branchial carina ................................ P. aculeatus

7. Inner angle of dorsal orbital sinus rounded, unarmed ... P. helleri

– Inner angle of dorsal orbital sinus with a spine .................... 8

8. Outer proximal margin of basal antennular segment with 1 spine ....................................................................................... P. galil

– Outer proximal margin of basal antennular segment with 2 spines ................................................................................... P. sculptus