KEY TO THE SPECIES OF THE SUBGENUS SCAPULICAMBARUS

• Cephalic process of first pleopod lobiform with or without angle on caudal margin (Fig. 56c-e):.....................................................................................................................................................  3

2(1).   Distal portion of first pleopod tapering distally, in lateral aspect, from level of shoulder (Fig.56a):.
           ...............................................................................................  Procambarus (S.) howellae  Hobbs, 1952.

       (Lentic and lotic habitats in the piedmont and upper coastal plain of Georgia between the
        Oconee and Ogeechee rivers.  Literature:  Hobbs, 1952b, 1962)

• Distal portion of first pleopod not markedly tapering distally, in lateral aspect, from level of
  shoulder (Fig. 56b; see also Fig. 6b):.................................................................................................
  ......................................................................................  Procambarus (S.) paeninsulanus  (Faxon, 1914).

       (Lentic and lotic habitats from the Choctawhatchee drainage in Florida to the St. Johns and
        St. Marys rivers, and from the Hillsborough River, Florida, northward to southeastern Alabama
        and southern Georgia.  Literature:  Hobbs, 1942b, 1962).

Fig. 56.  Lateral view of left first pleopods.  a, Procambarus howellae;  b, P. paeninsulanus;  c, P. okaloosae;  d, P. clarkii;  e, P. troglodytes.  (cp, cephalic process).

3(1).   Areola less than 12 times longer than broad (see also Fig. 56c):..........................................................
           ............................................................................................  Procambarus (S.) okaloosae  Hobbs, 1942.

       (Lentic and lotic habitats in the Perdido, Escambia, and Yellow drainage systems in
        Alabama and Florida.  Literature:  Hobbs, 1942b, 1962).

• Areola more that 12 times longer than broad (see also Fig. 56d, e):.......................................................
  ..........................................................................................................................................................................  4

4(3).   Caudal margin of cephalic process of first pleopod with distinct angle (Fig.56d):....................
            ....................................................................................................  Procambarus (S.) clarkii  (Girard, 1852).

       (Lentic and lotic habitats from southern Illinois to northern México and Escambia County,
        Florida.  Introduced in California, Hawaii, and Virginia.  Literature:  Penn, 1943;  Hobbs, 1962).

• Entire margin of cephalic process of first pleopod rounded, lacking angle (Fig. 56e):...............
  ........................................................................................  Procambarus (S.) troglodytes  (LeConte, 1856).

       (Lentic and lotic habitats in the lower piedmont and coastal plain from the Pee Dee drainage
        system in South Carolina to the Altamaha dainage in Georgia.  Literature:  Faxon, 1885;
        Hobbs, 1962).

END OF  SCAPULICAMBARUS

Last Updated:  10 September 2004