Ammotrechula pilosa Muma 1951
Ammotrechula pilosa ►Muma, 1951:
134, figs 288-290; ►Muma, 1962: 43, figs 52-53; ►Muma, 1963: 2; ►Muma, 1970a:
54; ►Muma, 1976: 27; Rowland and Reddell, 1976: 10; Punzo, 1998g: fig. 2-4a;
Brookhart and Brookhart, 2006: 325.
Female holotype from
Texas in the collection of the University of Utah. DZUU
Muma, 1951: 134, figs
FEMALE HOLOTYPE: Total length, 14.0 mm. Chelicerae,
1.2 mm. wide and 3.7 mm. long. Propeltidium, 2.7 mm. wide and 2.2 mm.
Coloration and markings in alcohol somewhat faded but apparently as
follows: chelicerae light yellow, with two dorsal and one ectal faint
dusky purple stripe; propeltidium dusky purplish brown except for a
small, oval, light area on each side of the eye tubercle, a large,
longitudinal, light, diamond-shaped area, two irregular medial light
areas near the posterior margin, and a light posterior marginal band;
mesopeltidium, metapeltidium, and abdominal tergites light and
apparently slightly dusky on lateral margins; second and third legs
light yellow with all femora faintly dusky at distal ends, all tibiae
faintly dusky on anterior faces and fourth tibiae faintly dusky on both
anterior and posterior faces; first legs light yellow, palpi light
yellow, with distal two-thirds of femora a dusky purplish brown, all of
tibiae dusky and metatarsi dusky at the proximal end and mesoventrally
for their entire length; eye tubercle dark; malleoli white. Dentition
typical of the Ammotrechinae as shown in figure 288. The peak of the
dorsal carina occurs over the first fondal tooth of the ectal row.
Palpi clothed with long and short hairs and scattered cylinder bristles
on the tarsi, metatarsi, and tibiae but no series of short stout spines
on either the metatarsi or tibiae.
Chelicerae three times as long as wide. Propeltidium wider than long by
a ratio of 1 to 1.2. Eyes slightly less than one diameter apart. Genital
plate typical of family; it is wider than long by a ratio of 1 to 1.7.
DIAGNOSIS: A lack of serial spines on the palpus distinguishes
MALES: Total length, 10.0 to 13.0 mm. Chelicerae 0.7 to 1.0 mm. wide and
2.6 to 3.2 mm. long. Propeltidium 1.7 to 2.1 mm. wide and 1.7 to 1.9 mm.
long. Allotype smaller. Color and markings in alcohol same as those of
female holotype, but all legs and palpi dusky purple except on coxae and
trochanters which are pale yellow; mesopeltidium, metapeltidium, and
abdominal sclerites dusky purple, with marginal and submarginal pale
Dentition of the chelicerae as in figures 52 and 53. Fixed finger
slender and elongate but bearing normal dentition. Intermediate tooth of
movable finger closer to principal tooth than anterior tooth. Dental
group of movable finger occupying about one-third of length of finger.
Flagellum as in A. peninsulana but margins curled mesially to
cover all of mesial surface except small area surrounding attachment
disc. Palpi clothed as in female. Chelicerae slightly less than three
times as wide as long. Propeltidium about as long as wide. Eyes
separated by slightly less than one diameter.
DIAGNOSIS: Males have the palpi dusky except for the coxae and
trochanters, the fixed cheliceral finger attenuate with the teeth only
slightly aborted, no mesal tooth on the movable finger, and no serial
ventral spinelike setae on the palpal tibia or metatarsus. Females
are colored like males, have a dorsal cheliceral carina, the genital
plate wider that long by a ratio of 1:1.2, and no serial ventral
spinelike setae on the palpi.
Muma 1962: United
5 July 1954 (W. J. Gertsch), 1 ♂ (allotype), 1 ♀, [AMNH];
Costa County - Mt. Diablo, 30 May 1955 (J. G. and S. G. Rozen)
1 ♂; Mt. Diablo (Russelman Park) 14 May 1955 (J. W. MacSwain),
Muma 1963: United
Nevada: Mercury, 2 ♀
designated as "allotype" a male from Tucson, Arizona, and noted that the
female collected with the allotype and
the specimens recorded from California are marked like the allotype, which
indicates that the holotype was a faded specimen or that the species is
variable in color. Muma (1970a) reported the range of this species as Arizona, California,
Nevada, and Texas. and again noted that this species seems somewhat variable in
color. Muma (1976) included the species in an annotated list of
Western Hemisphere solifuges, again listing its distribution as
Arizona, California, Nevada, and Texas. Brookhart and Brookhart
(2006): included the species in a checklist of continental North
American Solifugae, listing the distribution as Arizona, California,
Nevada, and Texas.