Processidae

Key for the identification of Processidae from Brazilian waters

(modified from Manning & Chace 1971 and Noël 1986):

1. P1 both chelate and lacking exopods; P2 symmetrical...................................... Ambidexter symmetricus

1’. Only one (usually the right) of P1 chelate, the other P1 ending in a simple dactylus................................. 2

2. P1 with exopods......................................................................... Nikoides schmitti

2’. P1 without exopods.................................................................................... 3

3. Pleura of fifth abdominal segment with posterolateral tooth...................................... Processa fimbriata

3’. Pleura of fifth abdominal segment rounded or angled posterolaterally, lacking distinct posterolateral tooth............... 4

4. Antennal spine absent.................................................................................. 5

4’. Antennal spine present................................................................................. 6

5. P2 asymmetrical; rostrum not markedly deflexed anteriorly; right P2 with 10–15 meral and 19–29 carpal articles, left P2 with 3–4 meral and 13–15 carpal articles...................................................... Processa bermudensis

5’. P2 symmetrical; rostrum deflexed anteriorly; right P2 with 5 meral and 10–14 carpal articles.............. Processa vicina

6. P2 symmetrical......................................................................... Processa hemphilli

6’. P2 asymmetrical...................................................................................... 6

7. Lobe on sixth abdominal segment above articulation of uropod produced into posterior spine........... Processa profunda

7’. Lobe on sixth abdominal segment above articulation of uropod unarmed.......................................... 8

8. Stylocerite truncated obliquely, without a developed tooth or a well-defined outer anterior angle; basicerite unarmed........................................................................................... Processa brasiliensis

8’. Stylocerite truncated transversely, angled, or with a more or less developed outer anterior tooth; basicerite armed with a lateral spine................................................................................. Processa guyanae