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70 Key to Families
Key to families of Florida decapods
[Based on Rathbun, 1918,1930,1937, Barnard, 1950,
Holthuis, 1955, and Williams, 1984]
1. General form shrimplike, usually compressed; pleuron of second somite never
overlapping that of first somite; first 3 pairs of pereopods usually chelate (except in
some Sergestoidea), third pair never unusually robust ....2
General form shrimplike, lobsterlike, or crablike; if shrimplike with pleuron of
second abdominal somite overlapping that of first somite and third pair of
pereopods not chelate or unusually enlarged (except Stenopodidae, with pleuron of
second abdominal somite not overlapping that of first somite; third pereopods
chelate, stronger than preceding) 8
2. (1) Fourth and fifth pereopods well developed 3
Fourth and fifth pereopods reduced or absent 7
3. (2) Postorbital spine present... Solenoceridae (page 97)
Postorbital spine absent 4
4. (3) Integument rigid, of stony appearance; cervical groove very faint or absent
Sicyoniidae (page 109)
Integument more or less flexible, not stony and rigid in appearance; cervical groove
present and easily discerned 5
5. (4) Eyestalks without tubercles on their mesial (inner) borders; epipods absent behind
third pereopods Penaeidae (page 82)
Eyestalks each with tubercle on its mesial (inner) border; epipods on all coxae from
second maxillipeds through fourth pereopods 6
6. (5) Distal, filamentous portion of upper antennular flagellum extensively developed
Benthesicymidae (page 79)
Distal, filamentous portion of upper antennular flagellum not extensively developed.
Aristeidae (page 79)
7. (2) Anterior region of cephalothorax not greatly elongate; gills present.
Sergestidae (page 115)
Anterior region of cephalothorax greatly elongate; gills absent
Luciferidae (page 125)
8. (1) Form shrimplike; usually with body compressed 9
Form lobsterlike or crablike 24