CAMBARUS

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KEY TO THE SPECIES OF THE SUBGENUS CAMBARUS


1.   Suborbital angle obsolete (Fig. 94a);  areola constituting more than 40 percent of entire length of
       carapace (Fig. 95a):.........................................................................  Cambarus (C.) ortmanni  Williamson, 1907.

       (Lotic and lentic habitats and burrows in eastern Indiana, western Ohio, and adjacent northern
        Kentucky.  Literature:  Williamson, 1907;  Rhoades, 1944a).

  • Suborbital angle present (Fig. 94b);  areola constituting less than 40 per cent of entire length of
    carapace (Fig. 95b, c):........................................................................................................................................  2
Fig. 94.  Lateral view of cephalic region.  a, Cambarus ortmanni;  b, C. b. bartonii.

2(1).   Rostrum acuminate (Fig. 95b):..........................................  Cambarus (C.) howardi  Hobbs and Hall,  1969.

       (Lotic habitats in the Chattahoochee River system from Hall to Douglas County, Georgia.
        Literature:  Hobbs and Hall, 1969).

  • Rostrum with margins somewhat abruptly contracted at base of acumen (Figs. 95c96):........................  3
Fig. 95.  Dorsal view of carapaces.  a, Cambarus ortmanni; b, C. howardi;  c, C. bartonii carinirostris.

3(2).   Rostrum with broad, short median elevation (carina) on dorsal surface near apex (Fig. 95c):..
           ...................................................................................................  Cambarus (C.) bartonii carinirostris  Hay, 1914.

       (Lotic habitats in the Cheat, Greenbrier (?), and Tygart rivers, West Virginia.  This is a local variant of
        C. bartonii and probably should not be recognized.  Literature:  Ortmann, 1931).

  • Rostrum without median elevation on dorsal surface near apex (Fig. 96):.....................................................  4

4(3).   Rostrum with conspicuously thickened margins forming angular bend (occasionally with slightly
           projecting knobs) at base of acumen (Fig. 96a):....................  Cambarus (C.) sciotensis  Rhoades, 1944.

       (Lotic habitats in the Scioto River drainage, Ohio and Kanawha drainage in West Virginia and
        southwestern Virginia.  Literature:  Rhoades, 1944b).

  • Rostrum without conspicuously thickened margins, latter never forming angular bend or knobs
    at base of acumen (Fig. 96b, c):..........................................................................................................................  5
Fig. 96.  Dorsal view of carapaces.  a, Cambarus sciotensis;  b, C. bartonii cavatus;  c, C. b. bartonii.

5(4).   Rostrum deeply excavate dorsally, often almost bladlelike (Fig. 96b):.........................................................
           .......................................................................................................  Cambarus (C.) bartonii cavatus  Hay, 1902.

       (Lotic habitats in the Tennessee River drainage system from southwestern Virginia to Walden
        Gorge, Tennessee.  It is questionalbe that this subspecies should be recognized.
        Literature:  Ortmann, 1931).

  • Rostrum only shallowly excavate dorsally, never ladlelike (Fig.  96c;  see also Figs. 86b, 88d, 89l, 90a, 94b):.
    ..................................................................................................  Cambarus (C.) bartonii bartonii  (Fabricius, 1789).

       (Lotic and lentic habitats from New Brunswick, Canada, to northern Georgia, Ohio, and Tennessee;
        restricted to the mountains and foothills from North Carolina southward.  Literature:  Crocker and
        Barr, 1968;  Ortmann, 1931).


END OF SUBGENUS CAMBARUS

Last Updated:  10 September 2004