Pachycheles Stimpson, 1858

Pachycheles Stimpson, 1858: 228 .

Pisosoma Stimpson, 1858: 228 .

Type-species. Porcellana grossimana (Guérin-Menéville, 1835) [by original designation].

Key to species known from Brazil

1. Front with tuft of setae................................................................................ 2

- Front with no setae.................................................................................... 4

2. Chelipeds with longitudinal rows of large and flattened imbricate tubercles; no gonopods in males............. P. monilifer

- Chelipeds granulate; males with gonopods................................................................. 3

3. Chelipeds not clearly grained, covered with dense, long setae....................................... P. chubutensis

- Chelipeds with distinct row of granules, covered with scattered, short setae........................... P. laevidactylus

4. Cervical groove well-defined..................................................................... P. greeleyi

- Cervical groove poorly defined.......................................................................... 5

5. Chelipeds smooth; carpus with round lamellar lobe on flexor margin........................................ P. riisei

- Chelipeds tuberculate; carpus with teeth on flexor margin.................................................... 6

6. Carapace as long as broad. Carpus of cheliped with serrate teeth on flexor margin......................... P. rugimanus

- Carapace broader than long. Carpus of cheliped with 3 broad acute tubercles on flexor margin.............. P. ackleianus