The Arachnid Order Solifugae



Phylogeny of the Solifugae
Keys to FamiliesFamily Ammotrechidae
Family Ceromidae
Family Daesiidae
Family Eremobatidae





Family Galeodidae
Family Gylippidae
Family Hexisopodidae
Family Karschiidae
Family Melanoblossidae
Family Mummuciidae
Family RhagodidaeFamily Solpugidae
Catalog of the Solifugae





Eremochelis arcus (Muma 1962)

Therobates arcus Muma, 1962: 15-17, figs 9-15; Muma, 1963: 1Adobe PDF icon.
Eremochelis arcus
(Muma): Muma, 1970a: 33-34; Muma, 1976: 19; Brookhart and Brookhart, 2006: 317

HOLOTYPE: United States. California: Kern County - Taft, 25 February 1921 (E. O. Essig), 1 male (holotype), 1 female (allotype).  Deposited in the American Museum of Natural History. 

Original description
Muma, 1962: 15-17, figs 9-15 (as Therobates arcus):

male holotype: Total length, 14.0 mm.

                            LENGTH         WIDTH
Chelicerae         4.7 mm             2.0 mm.
Propeltidium    2.4                     3.6

        Legs and palpi mangled, not measurable.
       Color in alcohol somewhat faded but apparently light to straw yellow marked with dusky reticulate purple. Propeltidium dusky except for a median ovate area extending from dark eye tubercle to posterior margin.  Mesopeltidium, metapeltidium, and abdominal tergites darker yellow than non-sclerotized areas but apparently not dusky. Palpi dusky on apical ends of femora and all of tibiae, metatarsi, and tarsi. Legs dusky on distal ends of femora and proximal ends of tibiae. Leg markings more distinct on fourth legs. Malleoli white.
       Dentition of chelicerae as shown in figures 10 and 11. Movable finger
with a large, slender, principal tooth and one small intermediate tooth
located at base of principal tooth. Fixed finger long, slender, and lightly bowed or arched. All fondal teeth distinct from dentate socket margin of movable finger. Fondal teeth graded in size I, III, II, IV. Fondal notch J-shaped, somewhat wider than base of fixed finger and containing one denticule.
       Groove of fixed finger a shallow, parallel-sided slot that is mesoventral but not extending to base of finger. Flagellum complex typical of group, with dorsal tubular bristles not strongly arched and apical plumose bristles slightly S-shaped but not flattened or otherwise modified. Mesial setae of movable finger plumose on proximal half of finger but simple distally.
       Eye tubercle situated on anterior margin of propeltidium. Eyes separated by slightly more than one diameter. Propeltidium wider than long by a ratio of 1 to 1.5.
       Metatarsus and tibia of palpus with scattered, long, slender spines; long, heavy cylinder bristles below and small fine ones above. Metatarsus with a scopula of 50 to 60 widely spaced papillae extending entire length of segment (fig. 12). Metatarsus of palpus about 3.5 times as long as tarsus.
       First post-spiracular abdominal sternite provided with four long flattened ctenidia extending well beyond posterior margin of succeeding segment (fig. 13).

Female allotype: Total length, 18.0 mm.

                            LENGTH         WIDTH
Chelicerae         5.8 mm             2.5 mm.
Propeltidium    3.0                     4.4
Palpi                   14.0                   -              
1st legs               11.5
4th legs              17.0

        Color in alcohol similar to that of male.
       Dentition of chelicerae as shown in figures 14 and 15. Movable finger with principal tooth moderately large, three intermediate teeth of which anterior is tiny and denticulate, an anterior tooth slightly smaller than principal tooth, uneven serration in front of anterior tooth, and low ridge in place of mesial tooth. Fixed finger with principal and medial teeth equally large, smaller anterior tooth, two intermediate teeth between principal and medial teeth, two between medial and anterior teeth, and indistinct serration in front of anterior tooth. Fondal teeth
same as in male.
       Structure similar to that of male except there is no scopula on the metatarsus of palpus and no distinct ctenidia on first post-spiracular abdominal sternite.
       Opercula of genital segment as shown in figure 9.



































Copyright 2005-2006.  All images in this site, even if they do not include an individual statement of copyright, are protected under the U. S. Copyright Act.  They may not be "borrowed" or otherwise used without our express permission or the express permission of the photographer(s),  artist(s), or author(s).  For permission, please submit your request to