Download PDF as one large file - AToL Decapoda

Key to Families 73
26. (25) Carapace with small rostrum; first pereopods much larger than others (body
tubular; antennae cylindrical, shorter than body) Synaxiidae (page 323)
Carapace without rostrum; first pereopods not enlarged except in Justitia 27
27. (26) Carapace subcylindrical; antennal flagella long, strong, and spiny
Palinuridae (page 313)
Carapace more or less flattened dorsoventrally, lateral margins sharp; antennae
short, flagella replaced by plates with dentate or lobulate margins
Scyllaridae (page 316)
28. (24) Either lobsterlike or crablike; abdomen extended, bent upon itself, or flexed
beneath thorax; last thoracic sternite free; uropods present; carapace not fused
with epistome; first, second, or first 2 pairs of pereopods chelate or subchelate ....
29
Crablike; abdomen permanently flexed beneath carapace; last thoracic sternite
fused with preceding; uropods rarely present, never biramous; carapace fused
with epistome; first pair of pereopods chelate or subchelate 40
29. (28) Second to fourth pereopods with dactyli conspicuously curved and flattened;
abdomen much reduced in size and flexed beneath thorax 30
Second to fourth pereopods with dactyli not conspicuously curved and flattened;
abdomen well developed but may be flexed beneath thorax 31
30. (29) First pair of pereopods subchelate; carapace depressed... Albuneidae (page 427)
First pair of pereopods simple; carapace subcylindrical Hi ppidae (page 433)
31. (29) Abdomen usually asymmetrical (rarely secondarily straightened), usually
membranous and with uropods adapted for holding body in hollow objects; rarely
leathery, unprotected, and bent under thorax 32
Abdomen symmetrical and obviously segmented; uropods well developed for
swimming, never for holding body in hollow objects 35
32. (31) Third maxillipeds approximated at base; chelipeds subequal, or left much larger
than right, rarely with right slightly larger than left 33
Third maxillipeds widely separated at base by sternum; right cheliped usually
much larger than left, left never larger than right, occasionally subequal 34
33. (32) Ventral antennular flagellum ending in filament Diogenidae (page 330)
Ventral antennular flagellum ending bluntly Coenobitidae (page 327)