Download PDF as one large file - AToL Decapoda

74 Key to Families
34. (32) Carapace firm anteriorly, more or less membranous posteriorly; rostrum obsolete
or nearly so; fourth pereopods unlike third Paguridae (page 359)
Carapace firm all over, spiny in many species; rostrum more or less spiniform;
fourth pereopods like third Lithodidae (page 355)
35. (31) Body subcylindrical; first two pairs of pereopods chelate or subchelate (first only
in Upogebiidae); abdomen extended 36
Body slightly depressed; only first pereopods chelate; abdomen bent under thorax.
38
36. (35) No linea thalassinica; both movable and fixed antennal thorns present; first
pereopods strongly chelate and conspicuously hairy Axiidae (page 289)
Linea thalassinica present; fixed antennal thorn absent; first pereopods chelate or
subchelate but not conspicuously hairy 37
37. (36) First pereopods chelate; rostrum inconspicuous or absent
.. Callianassidae (page 293)
First pereopods subchelate; rostrum well developed, dorsally flattened, spiny,
and hairy
Upogebiidae (page 309)
38. (35) Form somewhat lobsterlike; rostrum extended, well developed; abdomen loosely
flexed beneath posterior thorax; third maxilliped pediform 39
Form crablike (Euceramus elongate) with abdomen completely folded under
thorax; rostrum short and broad or wanting; third maxilliped flattened,
operculiform Porcellanidae (page 410)
39. (38) Antennal peduncle composed of four movable segments; telson subdivided into
two or more plates, not folded sharply against itself, without lateral indentation ...
Galatheidae (page 397)
Antennal peduncle with five segments, third segment not being fused with
second; telson never subdivided into two or more plates, folded sharply against
itself, with lateral indentation Chirostylidae (page 393)
40. (28) Mouth-frame (buccal cavity) triangular.... 41
Mouth-frame (buccal cavity) more or less quadrate 46