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116 Family Sergestidae
Genus Sergestes H. Milne Edwards, 1830
Key to species
[based on Crosnier and Forest, 1973]
1. Third maxillipeds at most as long as third pereopods 2
Third maxillipeds much longer than third pereopods 4
2. (1) Two distal segments of fifth pereopod setose on only one margin (third segment of
antennular peduncle equal to or longer than first; petasma lobes short, stumpy)
S. atlanticus
Two distal segments of fifth pereopod setose on both margins 3
3. (2) Supraorbital spines always present, acute and easily visible S. henseni
Supraorbital spines nearly always absent or, when present, miniscule.
S. paraseminudus
4. (1) Two distal segments of fifth pereopod setose on both margins 5
Two distal segments of fifth pereopod setose on only one margin 6
5. (4) Dactylus and distal half of propodus of third maxilliped with numerous spines
forming comb-like structure; processus ventralis of petasma unarmed',
.5. pectinatus
Dactylus and distal half of propodus of third maxilliped armed with spines but not
forming comb-like structure; processus ventralis of petasma armed distally with
numerous spines S. sargassi
6. (4) Dactylus of third maxilliped subdivided into 6 segments and with 2 terminal spines;
external margin of exopod of uropod entirely fringed S. edwardsii
Dactylus of third maxilliped subdivided into 4 segments and with single terminal
spine; small proximal portion of external margin of exopod of uropod naked 7
7. (6) About 1/3 or a little more of external margin of exopod of uropod naked; first
segment of antennular peduncle much shorter than third S. armatus
About 1/6 or 1/7 of external margin of exopod of uropod naked; first segment of
antennular peduncle a little longer than third 5. vigilax