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Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume V (1877-1881)

Bundy, Will F.
A list of the crustacea of Wisconsin,   pp. [177]-184 PDF (2.0 MB)


Page 179


              A List of the Crustacea of lWisconsin.    179
  The genus Cambarus is the only representative of the family
Astacide in the fresh waters of the United States east of the
Iloeky Mountains. These animals, popularly known as " craw-
fish " or " crabs," are our largest crustaceans.
The great
number of
species, separated by characters generally obscure and difficult of
definition, many of them remarkably inconstant, with an un-
doubted dimorphism of males and the not infrequent occurrence
of abnormal individuals, render the study of this genus particu-
larly perplexing.
  The following key will assist in separating the species herein
mentioned:
  A.-Rostrurn toothed near apex, at least when young.
  B.-Rostrum long, painted; first abdominal legs of male
truncate; third joint of third and fourth thoracic legs hooked.
  C.- hands long and slender; fingers curved; cephalothorax
densely tuberculate.  C. atcgs.
  CC.- Hands short; cephalothorax smooth or nearly so.  C.
sly(ihts.
  BB.- Rostrum subquadrangular; first abdominal legs of male
bifid; hooks on third joint only, of thoracic legs.
  D.- Tips of first abdominal legs of male nearly equal, straight
or slightly curved; two rows of teeth on lower border of brach-
ium v er, indistinct or obsent.
   E.-Rostrum carinated above. C. propinqlues.
   EE.- Rostrum not carinated above; hands large; fingers gap-
ing at base. C. placidus.
   DD.- Tips of first abdominal legs of male unequal and re-
 curved.
   F.- Margins of rostrum converging in front; first abdominal
 legs of male long, thick, inner ramus swollen near apex.  C.
 Wisconsinenssis.
   AA.- Rostrum toothless.
   Il.- First abdominal legs of male truncate; three slender teeth
 at apex. C. aacilis.
   hiHl-First abdominal legs of male ending in two short, thick,
 recurved teeth.
   I.-Dorsal areola wide. C. iw(t)-lonis.


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