EREBICAMBARUS

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KEY TO THE SPECIES OF THE SUBGENUS EREBICAMBARUS


1.    Rostrum with marginal spines or tubercles (Fig. 102a):................................................................................  2
  • Rostrum lacking marginal spines or tubercles (Fig. 102b-d):....................................................................  4
Fig. 102.  Dorsal view of carapaces.  a, Cambarus rusticiformis;  b, C. tenebrosus;  c, C. laevis;  d, C. cahni.

2(1).   Cervical spines absent (Fig. 91b):.......................................................  Cambarus (E.) hubbsi  Creaser, 1931.

       (Lotic habitats from the Meramec River system to the Eleven Point system in Missouri and
        Arkansas.  Literature:  Williams, 1954a).

  • Cervical spines present (Fig. 102a, b):......................................................................................................  3

3(2).  Areola less than 7 times longer than broad;  rostrum usually with slightly concave lateral
          margins (Fig. 102a; see also Fig. 89d, g):..........................  Camabrus (E.) rusticiformis  Rhoades, 1944.

       (Lotic habitats in the Cumberland River System in Kentucky and Tennessee.
        Literature:  Rhoades, 1944a;  Hobbs, 1969b).

  • Areola more than 7 times longer than broad; rostrum with straight convergent margins
    (Fig. 102b;  see also Fig. 103b, d):..................................................  Cambarus (E.) tenebrosus  Hay, 1902.

       (Lotic epigean and subterranean habitats from the Ohio River - below confluence with
        Salt River - southward to the Tennessee River in Alabama, and eastward on the Cumberland
         Plateau.  Literature:  Rhoades, 1944a;  Hobbs, 1969b).


4(1).   Albinistic;  length of mesial margin of palm of chela distinctly greater than width of palm
           (Fig. 103a;  see also Fig. 10d):...........................................................  Cambarus (E.) hubrichti  Hobbs, 1952.

       (Subterranean waters of the White River basin in Carter, Oregon, and Ripley counties, Missouri.
        Literature:  Hobbs and Barr, 1960).

  • Pigmanted;  length of mesial margin of palm of chela subequal to, or distinctly less than, width
    of palm (Fig. 103b, c):....................................................................................................................................  5

5(4).  Areola 7 to 8 times longer than broad (Fig. 102d):..............................  Cambarus (E.) cahni  Rhoades, 1941.

       (Lotic epigean and subterranean habitats in northern Alabama.  The relationship of this species
         to C. tenebrosus, of which it may be a subspecies or a synonym, is uncertain.
         Literature:  Rhoades, 1941b;  Hobbs and Barr, 1960).

  • Areola more than 8 times longer than broad (Fig. 102b, c):......................................................................  6
Fig. 103.  a-c, Dorsal view of chelae;  d-f, Lateral view of left first pleopods.  a, Cambarus hubrichti;  b, C. tenebrosus;  c, C. laevis;  d, C. tenebrosus;  e, C. laevis;  f, C. ornatus.

6(5).   Areola with at least 4 punctations across narrowest part (Fig. 102b);  mesial process of first pleopod
           broadly rounded distally (Fig. 103d;  see also Fig. 103b):................  Camabrus (E.) tenebrosus  Hay, 1902.

       (See couplet 3 for range and literature).

  • Areola with no more than 3 punctations across narrowest part (Fig. 102c);  mesial process of first
    pleopod strongly tapered, often subacute (Fig. 103e, f):...........................................................................  7

7(6).   First pleopod with least diameter of gap between mesial process and central projection at least
          1/3 of least height of latter (Fig. 103e;  see also Figs. 102c, 103c):.......................................................
           ...........................................................................................................................  Cambarus (E.) laevis  Faxon, 1914.

       (Lotic epigean and subterranean habitats in southern Illinois and Indiana, southwestern Ohio, and
        northern Kentucky, in the Ohio River rainage.  Literature:  Faxon, 1914;  Hobbs, 1969b).

  •  First pleopod with least diameter of gap between mesial process and central projection much less
    than 1/3 least height of latter (Fig. 103f):................................................  Cambarus (E.) ornatus  Rhoades, 1944.

       (Lotic habitats from the lower Kentucky River system to the Salt River, Kentucky.  It seems likely that
        this species intergrades with C. tenebrosus.  Literature:  Rhoades, 1944a;  Hobbs, 1969b).


END OF SUBGENUS EREBICAMBARUS

Last Updated:  10 September 2004