The Arachnid Order Solifugae







Eremobates aztecus Pocock 1902

Eremobates aztecus Pocock 1902c: 60-61, plate XII figs 2, 2a, 3, 3a;  Roewer 1933: fig. 163c; ►Roewer 1941: 178; Muma 1970a: 26, figs 28-31; Muma 1976: 17; Muma 1986: 20; Muma 1987: 20; Vázquez Rojas 1995: 31; Vázquez Rojas 1996e: 76; Brookhart and Brookhart, 2006: 305.
Eremoperna azteca (Pocock): Roewer 1934: 558, 560-562, figs 323d, 324e; Caporiacco 1938: 254.
Eremoperna aazteca (Pocock): Roewer 1934: 559, fig. 322c.

HOLOTYPE: Hab. MEXICO, Guanajuato, Atoyac in Vera Cruz (A. Dugès).
TYPE LOCALITY: Male and female types from Guanajuato. Mexico. in BMNH.

Original description:
Pocock, 1902c: 60-61, plate XII figs 2, 2a, 3, 3a

, Colour: carapace, with exception of the black ocular tubercle and a narrow marginal transverse line on each side of the latter, mandibles, palpi, and legs a uniform clear ochre-yellow, the tip of the tarsus of the palp  only being brownish; terga. of abdomen and thorax blackish, sides of these regions deep ashy-grey, sternal plates yellowish. Width of head-plate exceeding length of patella of palp, about equal to its tibia and tarsus, and to patella or tibia and tarsus of fourth leg; tubercle furnished in front with numerous subequal bristles. Mandible furnished above with simple long bristles; upper jaw armed distally with two large subequal teeth and a smaller tooth between them, proximally with one very large tooth, which bears two much smaller teeth on its anterior slope at the base, and behind it one minute tooth just above the upper cheek-tooth of the outer row, upper cheek-tooth of inner row long; lower jaw armed with two large teeth, the distal a little smaller than the proximal, and two smaller intermediate teeth, the upper of which is situated on the anterior slope of the proximal principal tooth and the lower at its base. Palpi covered with longer and shorter bristles, entirely without spines, except for one long apically setiform spine on the inner side of the distal end of the femur; lower side of the tibia beset with many vertical and truncate so-called cylindrical bristles. Patella of legs, armed beneath apically with a pair of long spines, which on that of the fourth leg are apically setiform, and one anterior setiform spine, thicker on the fourth than on the third, and very slender on the second, in the distal third of the segment; the tibia armed beneath with three anterior and four posterior slender spines (in addition to the five strong spines on the upperside of these segments on the second and third legs); tarsus of fourth with four pairs of spines, the sides and the lower surface of the segment normally bristly.
♂. Resembling the female in colour, but with the paJpi and legs stained with brown. Carapace about two-thirds the length of the patella, or the tibia and tarsus of the palp and of the patella of the fourth leg, and as long as the tibia of the fourth. Mandible with upper fang nearly straight, gradually tapering to a point., projecting nearly at right angles from the plane of the cheek-teeth; the long upper cheek-tooth of the outer series separated from the base of the fang by a wide space, which is about equal to the diameter of the base of the fang, a minute tooth above the long cheek-tooth and three below
it, the middle of which is the larger; the inner row of four teeth, the upper the largest, the third larger than the second, the fourth or lowest the smallest., and situated on the tooth above it; lower jaw armed with one large tooth, which is furnished anteriorly at the base with one minute tooth. Spine-armature of legs as in femaIe.

Measurements in mm.- ♀. Total length of trunk 27; width of head-plate 7 ; length of palpus 19, its patella 6: tibia and tarsus 7; fourth leg 22, its patella 7. ♂. Total length 19; width of carapace 4.5; length of palpus 19, its patella 7; tibia and tarsus 7.3 ; fourth leg 22, its patella 7.

Roewer 1933: fig. 163c;

Roewer 1934: 558, 560-562, figs 323d, 324e (as Eremoperna azteca); 59, fig. 322c (as Eremoperna aazteca (Pocock).

Schlüssel der ♂♂ (inkl. Diagnose):
1".  Büschel des Flagellumkomplexes nur aus einfachen, gleichartigen
Borsten bestehend; unbeweglicher Finger ohne einen dorsal-basalen Höcker ......................................................................2.
2".  Unbeweglicher
Finger mit 4 medialen und 4 lateralen Wangenzähnen, deren 1. jeweils der größte seiner Reihe ist; beweglicher Finger mit 1 Haupt- und 1 medialen Wangenzahn, ohne weitere Zähne; Gebiß (Abb. 322, c); Pedipalpen wie bei E. formidabilis ; 2. Tibia dorsal-apikal mit 1 und 3. Tibia hier mit 2 Dornen; 2.-4. Metatarsus wie bei E. formidabilis bedornt. 5. Sternit des Opisthosoma mit Ctenidien und Färbung wie bei E. formidabilis; Korperlänge 19 mm; Mexiko..........................................................................................................................3. E. azteca

Schlüssel der ♀♀ (inkl. Diagnose):
I". Beweglicher Finger mit nnr 2 Zwischenzähnen.........................................................3.
3' Beweglicher Finger mit 1 medialen Wangenzahn; Gebiß (Abb.323,d); 2. Tibia dorsal-apikal mit 1 und 3. Tibia hier mit 2 Dornen; 2. und 3. Metatarsus dorsal mit 5 Dornen der Haupt- und 4 Dornen der Nebenreihe; Sternithälften des Genitalsegmentes (Abb. 324, e); Pedipalpen nur behaart, ihr Metatarsus ohne ventrale Scopula und ohne Zylinderborsten; Färbung wie beim ♂; Körperlänge 27 mm; Mexiko.......................................................................................,,,,......................3.
E. azteca

3. Eremoperna azteca Pocock 1902 S. 60 (sub Eremobates). ♂, ♀ - Mexiko (Guanajuato, Atoyac) - (vidi 1 ♂, 2 ♀, Typus).

Caporiacco, 1938: 254 (as Eremoperna azteca).

Roewer 1941: 178;

Erneut gefunden und nachgewiesen aus: Mexico (Patzcuaro) - 1 ♂ - (Typus im Zool. Inst. Univ. Bologna?).

Muma, 1970a: 26, figs 28-31;

MALE: TYPE: Total length 24.0 mm.





5.8 mm.

2.8 mm.


3.0 mm

4.2 mm


21.0 mm


1st legs

18.0 mm


4th legs

28.0 mm


Color in alcohol pale yellow except as follows, propeltidium narrowly dusky on anterior margin; abdominal tergites dusky purple. 
Dentition as shown in figures 28 and 29. Movablc finger with distinct mesal tooth, anterior tooth of movable finger reduced to an indistinct ridge, and fondal notch with aborted teeth. Palpi with usual clothing except cylinder bristles fewer than usual and no scopula. Abdominal ctenidia absent.

FEMALE TYPE, Total length 33.5 mm.





8.0 mm

3.7 mm


4.2 mm

4.2 mm


20.0 mm

6.9 mm

1st legs

19.0 mm

4th legs

21.0 mm


Color in alcohol same as that of male except abdominal tergites darker. Structure typical of genus. Dentition as shown in figure 30; mesal tooth of movable finger present. Abdomen with trace ctenidia. Palpi without scopula but otherwise with typical bristles, setae, and spines. Opercula as shown in figure 31. 

Figs.  28-31.  Eremobates aztecus Pocock (redrawn from Muma (1970): 28. Ectal view of right male chelicera.  29. Mesal view of male fixed finger.  30. Ectal view of left female chelicera.  31. Ventral view of female genital opercula.

Muma, 1976: 17

Male and female types from Guanajuato, Mexico in BMNH. Distibution North America: Mexico (Guanajuato), known only from the types.

Muma, 1986: 20; Muma 1987: 20

Pocock described this species from Distrito Federal, Mexico; Roewer (1934) also recorded it from Atoyac, Mexico, and (1941) from Patzcuaro, Mexico.

Vázquez Rojas (1995) included this species in a list of the solifuges of Mexico.

Vázquez Rojas, 1996e: 76

Brookhart and Brookhart, 2006: 305.
Brookhart and Brookhart (2006) included this species in their annotated checklist of continental North American Solifugae,




Pocock (1902) - From key to Central American species: Upper (immovable) jaw of mandible toothless, nearly straight, and projecting almost at right angles from the basal area bearing the cheek·teeth. (Males.)
Lower jaw of mandible with one large proximal tooth and one or two small teeth in front of it.
Distal end of femur and proximal end of patella of palp unspined; lower jaw of mandible with one small tooth in front of the large tooth, and none on the inner side.
Mandible without dark stripes; upper jaw almost straight, gradually tapering; upper long cheek-tooth separated from base of movable jaw by a space which is nearly equal to the basal diameter of the latter

Muma 1970: DlAGNOSIS: Males are distinguished by the lack of a scopula, the lack of ctenidia, and pale palpi and legs. Females are similarly colored with distinctive opercula. DISCUSSION: The mesodorsal position of the male cheliceral mesal grooye. the multiple intermediate teeth of the female movable cheliceral finger, and the distinctive opercula have prompted the placement of this species in a separate species group.














































































































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