1. Mesial process of first pleopod
without longitudinal groove along mesial surface of apical 1/3
(Fig. 15):..........................................................................................................................................................
2
- Mesial process of first pleopod with longitudinal groove
along mesial surface of apical 1/3
(Fig. 16):.......................................................................................................................................................
7
 |
Fig. 15. Mesial view of left first
pleopods. a, Cambarellus shufeldtii;
b, C. diminutus; c, C. schmitti; d, C.
ninae; e, C. puer; f, C. alvarezi
(after Villalobos, 1955) |
2 (1). Terminal elements of first pleopod almost straight
and directed distally (Fig 15a):
......................................................................................................
Cambarellus shufeldtii
(Faxon, 1884).
(Lentic and
sluggish lotic habitats in the Mississippi drainage system of southern Illinois,
Tennessee, Arkansas and
Louisiana; in the Red River system in Louisiana and Texas;
and in the Pascagoula and Pearl
River systems in Mississippi. Introduced into Rapides,
St. Bernard and St. Tammany
parishes, Louisiana. Literature: Black, 1965; Hobbs and
Marchand, 1943; Penn, 1959).
- Central projection of first pleopod always curved and
other terminal elements never directed
distally (Fig. 15b-f):
....................................................................................................................................
3
3(2). Caudal process of first pleopod broadly
triangular and in lateral aspect obscuring mesial
process (Fig.
15b):
...................................................................
Cambarellus diminutus Hobbs, 1945
(Lentic and
sluggish lotic habitats in Mobile County, Alabama, and George and Jackson
counties,
Mississippi. Literature: Hobbs, 1945b; Black, 1965).
- Caudal process of first pleopod digitiform or
subsetiform and in lateral aspect never obscuring
mesial process (Fig. 15c-f):
......................................................................................................................
4
4(3). Mesial process of first pleopod broadly
triangular, its apex curved distolaterally (Fig. 15c): .............
..........................................................................................................
Cambarellus schmitti
Hobbs,
1942
(Springs and
streams from Mobile County, Alabama, eastward to the Suwannee River drainage
in Florida.
Literature: Hobbs, 1942b).
- Mesial process comparatively slender and directed
subcaudally (Fig. 15d-f): ..................................... 5
 |
Fig. 16.
Mesial view of left first pleopods. a, Cambarellus
occidentalis;
b, C. areolatus; c, C. chapalanus; d, C.
patzcuarensis; e, C. zempoalensis;
f, C. montezumae. |
5(4). Central projection of first pleopod
directed caudally and extending much beyond other terminal
elements (Fig.
15d):
...........................................................................
Cambarellus ninae Hobbs, 1950
(Lentic
habitats in Aransas County, Texas. Literature: Hobbs, 1950).
- Central projection of first pleopod directed
caudodistally and not extending caudally so far as
other terminal elements (Fig. 15e,f)
..........................................................................................................
6
6(5). Mesial
process of first pleopod subsetiform (Fig. 15f) ...........
Cambarellus
alvarezi Villalobos, 1952
(Lentic habitat at
Potosí, Nuevo León, 23 km. northwest of Galena, México; known only
form the type-locality.
Literature: Villalovos, 1955)
- Mesial process of first pleopod robust but subacute (Fig.
15e; see also Fig 5c):..............................
.................................................................................................................
Cambarellus puer Hobbs,
1945
(Lentic and
sluggish lotic habitats from Brazos and Matagorda counties, Texas, to western
Tennessee, Holmes County,
Mississippi, and Ascension Parish, Louisiana. Literature:
Penn and Hobbs, 1958; Black,
1965),
7(1).
Central projection of first pleopod constituting at least 1/5 total length of
appendage (Fig. 16a,b)
........................................................................................................................................................................
8
- Central projection of first pleopod constituting at
less than 1/5 total length of appendage
(Fig. 16c-f).....................................................................................................................................................
9
8(7). Areola
at least 3.5 times longer than broad (Fig. 17a; see also
Fig. 16a):..........................................
...............................................................................................
Cambarellus occidentalis (Faxon,
1898)
(Lentic
habitats in Michoacán and Sinaloa, México. Literature: Faxon,
1898; Villalobos, 1955).
- Areola less than 3.5 times longer than broad. (Fig.
17b; see also Fig. 16b)....................................
...................................................................................................
Cambarellus areolatus
(Faxon,
1885)
(Lotic
habitats in Coahuila, México. Literature: Faxon, 1898; Villalobos, 1955).
 |
Fig. 17. Dorsal
view of carapaces. a, Cambarellus occidentalis;
b, C. areolatus; c, C. chapalanus; e, C.
patzcuarensis. |
9(7). Length
of acumen of rostrum as great or greater than distance between tips of marginal
spines (Fig.
17c,d)....................................................................................................................................
10
- Length of acumen of rostrum less than distance
between tips of marginal spines (Fig.
17c,d).........................................................................................................................................................
11
10(9).
Acumen decidedly longer than distance between tips of marginal spines of
rostrum; cephalothorax
slender
and gently tapering in width anteriorly (Fig. 17c; see also
Fig. 16c):
...................................
...........................................................................................
Cambarellus chapalanus
(Faxon,
1898)
(Lentic
habitats in Jalisco and Michoacán, México. Literature: Faxon,
1898; Villalobos, 1955)
- Acumen subequal to or only slightly longer than
distance between marginal spines of rostrum;
cephalothorax somewhat robust and rather abruptly tapering in width
anteriorly (Fig. 17d; see
also Fig. 16d):
............................................................
Cambarellus
patzcuarensis Villalobos, 1943
(Lago de
Patzcuaro, Michoacán, México. Literature: Villalobos, 1955)
 |
Fig. 18. a,b,
Dorsal view of carapaces; c,d, Dorsal view of
chelae.
a, Cambarellus zempoalensis; b, C.
montezumae; c, C. zempoalensis;
d, C.
montezumae. |
11(9).
Lateral margin of chela strongly convex (Fig. 18c; see also
Figs. 16e, 18a): .................................
....................................................................................
Cambarellus zempoalensis
Villalobos, 1943
(Lagunas de
Zempoala, Morelos, México. Literature: Villalobos, 1955).
- Lateral margin of chela not markedly convex (Fig.
18d; see also Figs. 16f, 18b): ............................
.......................................................................................
Cambarellus montezumae
(Saussure,
1858)
(Sluggish
streams and lentic situations in the Valley of México and Pacific slope.
The
subspecies C. m.
dugesii (Faxon, 1898) and C. m. lermensis Villalobos, 1943, cannot
be separated by me from
the typical form of the species. Literature: Villalobos, 1955)
|
