Key To Hobbseus

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KEY TO THE SPECIES OF THE GENUS HOBBSEUS


1.    Central projection of first pleopod directed caudally at angle less than 30 degrees to main shaft
        of appendage (Fig. 58a, b):..............................................................................................................................  2
  • Central projection of first pleopod directed caudally at angle of 90 degrees or more to main shaft of appendage (Fig. 58c-e):.................................................................................................................................  3
Fig. 58.  Lateral view of left first pleopods.  a, Hobbseus orconectoides;  b, H. cristatus;  c, H. attenuatus;  d, H. valleculus;  e, H. prominens.

2(1).  Central projection of first pleopod directed caudally at less than 20 degrees to main shaft of
          appendage, mesial process at less than 45 degrees (Fig. 58a):..............................................................
          ..................................................................................  Hobbseus orconectoides Fitzpatrick and Payne, 1968.

       (Lentic habitat and burrows, 4.25 miles north of Starkville, Oktibbeha County, Mississippi.
         Literature: Fitzpatrick and Payne, 1968).

  • Central projection of first pleopod directed caudally at more than 45 degrees to main shaft of
    appendage, mesial process at approximately 90 degrees (Fig. 58b):......................................................
    ...............................................................................................................  Hobbseus cristatus  (Hobbs, 1955).

3(1).  Mesial process of first pleopod directed caudally at 90 degrees to main shaft of appendage
          (Fig 58c):..............................................................................................  Hobbseus attenuatus  Black, 1969.

  • Mesial process directed caudoproximally at more than 90 degrees to main shaft of appendage
    (Fig. 58d, e):.....................................................................................................................................................  4
Fig. 59.  Dorsal view of carapaces.  a, Hobbseus valleculus;  b, H. prominens.

4(3). Central projection of first pleopod forming broad arc with tip directed almost proximally (Fig. 58d);
          rostrum with margins tapering from base (Fig. 59a):...........  Hobbseus valleculus  (Fitzpatrick, 1967).

       (Stream tributaries of the Pearl River in Choctaw County, Mississippi.
         Literature:  Fitzpatrick, 1967b;  Fitzpatrick and Payne, 1968).

  • Central projection of first pleopod only slightly arched with tip directed caudoproximad (Fig. 58e);
     rostrum with convex margins (Fig. 59b):.................................  Hobbseus prominens  (Hobbs, 1966). 

       (Lentic and lotic habitats and burrows in Choctaw, Clarke, Dallas, Hale, Marengo, Perry,
        and Sumter counties, Alabama.  Literature:  Fitzpatrick and Payne, 1968;  Hobbs, 1966).


END OF HOBBSEUS

Last Updated:  10 September 2004