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Family Crangonidae
Key to genera and species
[Based on Dardeau and Heard, 1983, and Chace, 1984]
Family Crangonidae 27 1
1. Second pereopods subequal in length to other pereopods 2
Second pereopods much shorter than other pereopods 3
2. (1) Carapace with 1 dorsal median spine Crangon septemspinosa
Carapace with 2 to 4 dorsal median spines (sixth abdominal somite stout, expanded
posterolaterally into prominent wing-like lobes or keels)
Metacrangon jacqueti agassizii
3. (1) Eight branchiae on each side of body; apices of branchiae directed anteriorly
(rostrum simple, not cleft apically, with 3 pairs of lateral teeth; median carina on
carapace armed with 4 teeth; abdominal sterna unarmed)
Parapontocaris caribbaea
Six or seven branchiae on each side of body; apices of branchiae directed
posteriorly , 4
4. (3) Rostrum armed with 1 or 2 pairs of lateral teeth in posterior half of length; first
pereopod with rudimentary exopod; hepatic spines present
Pontophilus brevirostris
Rostrum without lateral teeth in posterior half; first pereopod without trace of
exopod; hepatic spines absent Philocheras gorei