KEY TO THE SPECIES OF THE SUBGENUS HAGENIDES

• Central projection (e) of first pleopod beaklike and directed caudally, distally, or
  caudodistally (Fig. 41b-e):.......................................................................................................................    5

Fig. 41.  Lateral view of left first pleopods.  a, Procambarus r. rogersi;  b, P. geodytes; c, P. truculentus;  d, P. advena;  e, P. pygmaeus.  (cp, cephalic process;  e, central projection).

2(1).   Caudal knob (ck) of first pleopod directed mesially at approximately right angle to principal
           axis of shaft of appendage (Fig. 42a; see also Fig. 41a):..................................................................
           ........................................................................  Procambarus (H.) rogersi rogersi  (Hobbs, 1938).

           (Burrows in eastern Calhoun County, Florida.  Literature:  Hobs, 1945a)

• Caudal knob (ck) of first pleopod directed distolaterally at angle less than 90 degrees to
  principal axis of shaft of appendage (Fig. 42b-d):..............................................................................    3

3(2).  Cephalic process (cp) of first pleopod extending as far distally as central projection (Fig. 42b;
           see also Fig. 26a):......................  Procambarus (H.) rogersi expletus  Hobbs and Hart, 1959.

           (Known only from the type-locality, burrows 0.9 mile north of Clarksville, Calhoun County,
            Florida.  Literature:  Hobbs and Hart, 1959).

• Cephalic process (cp) of first pleopod not extending so far distally as central projection
  (Fig. 42c, d):.............................................................................................................................................    4

4(3).  Caudal knob of first pleopod in caudal aspect, distinctly fingerlike, longer than broad (Fig. 42c):...
           ....................................................................  Procambarus (H.) rogersi campestris  Hobbs. 1942.

          (Burrows in Leon and Wakulla counties, Florida.  Literature:  Hobbs, 1945a).

• Caudal knob of first pleopod in caudal aspect, thumblike, almost or quite as broad as long
  (Fig. 42d):...........................................  Procambarus (H.) rogersi ochlocknensis  Hobbs, 1942.

          (Burrows in Gadsden and Liberty counties, Florida.  Literature:  Hobbs, 1945a).

Fig. 42.  Caudal view of distal portion of left first pleopods.  a, Procambarus r. rogersi;  b, P. r. expletus;  c, P. r. campestris;  d, P. r. ochlocknensis.  (ck, caudal knob;  cp, cephalic process).

5(1).   Ischia of third and fourth pereiopods with hooks (Fig. 4c; see also Fig. 41b):.................................
           ...................................................................................  Procambarus (H.) geodytes  Hobbs, 1942.

           (Burrows along the St. John's River and its tributaries from Putnam County south to
             Orange County, Florida.  Literature:  Hobbs, 1942b).

• Ischia of only third pereiopods with hooks (Fig. 4a):...........................................................................    6

6(5).   Central projection (e) and mesial process of first pleopod directed caudally at angle of
            90 degrees to axis of main shaft of appendage (Fig. 41c):.............................................................
            .............................................................................  Procambarus (H.) truculentus  Hobbs, 1954.

           (Burrows between the Savannah and Altamaha rivers in Georgia.  Literature: Hobbs, 1954).

• Central projection (e) and mesial process of first pleopod directed caudodistally at angle
  much less than 90 degrees (Fig. 41d, e):............................................................................................    7

7(6).   Cephalic process (cp) of first pleopod moderately well developed to rudimentary (Fig. 41d):.....
           ................................................................................  Procambarus (H.) advena  (LeConte, 1856).

           (Burrows in the lower coastal plain between the Savannah River, Georgia, and
            Alachua County, Florida.  Literature:  Hobbs, 1942b).

• Cephalic process (cp) of first pleopod totally absent (Fig. 41e): .....................................................
  ................................................................................  Procambarus (H.) pygmaeus  Hobbs, 1942.

           (Lentic and lotic habitats and burrows in southwestern Georgia and in Gulf, Liberty,
            Leon, and Wakulla  counties, Florida.  Literature:  Hobbs, 1942b).

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END OF HAGENIDES

Last Updated:  10 September 2004