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FAMILY VAEJOVIDAEGenus ParavaejovisGenus ParuroctonusGenus PseudouroctonusGenus SerradigitusGenus SmeringerusGenus SyntropisGenus UroctonitesGenus UroctonusGenus Vaejovis

      eusthenura group
           Vaejovis bilineatus
           Vaejovis coahuilae
        Vaejovis confusus
       Vaejovis diazi diazi
      Vaejovis diazi transmontanus
       Vaejovis eusthenura
       Vaejovis flavus
      Vaejovis galbus
      Vaejovis glabrimanus
      Vaejovis globosus
       Vaejovis gravicaudus
        Vaejovis hoffmanni hoffmanni
       Vaejovis hoffmanni fuscus
      Vaejovis punctatus punctatus
       Vaejovis punctatus spadix
      Vaejovis punctatus variegatus
       Vaejovis puritanus
      Vaejovis spinigerus
       Vaejovis viscainensis
        Vaejovis vittatus
        Vaejovis waeringi
       Vaejovis waueri
      intrepidus group
        Vaejovis intrepidus intrepidus
        Vaejovis intrepidus atrox
        Vaejovis intrepidus cristimanus
      Vaejovis occidentalis
      Vaejovis subcristatus
      mexicanus group
        Vaejovis carolinianus
        Vaejovis cashi
        Vaejovis chamelaensis
      Vaejovis chiapas
       Vaejovis chisos
        Vaejovis deboersi
        Vaejovis dugesi
        Vaejovis feti
        Vaejovis franckei
       Vaejovis granulatus
      Vaejovis jonesi
       Vaejovis lapidicola
      Vaejovis maculosus
       Vaejovis mexicanus mexicanus
      Vaejovis mexicanus smithi
      Vaejovis monticola
      Vaejovis nigrofemoratus
        Vaejovis pattersoni
       Vaejovis paysonensis
      Vaejovis pusillus
       Vaevovis rosssmanni
      Vaejovis setosus
      Vaejovis sprousei
      Vaejovis tesselatus
      Vaejovis vaquero
        Vaejovis vorhiesi
      nitidulus group    
      Vaejovis curvidigitus
      Vaejovis davidi
      Vaejovis decipiens
      Vaejovis gracilis
      Vaejovis intermedius
      Vaejovis janssi
      Vaejovis kochi
      Vaejovis mauryi
      Vaejovis minckleyi
      Vaejovis mitchelli
      Vaejovis nigrescens
      Vaejovis nitidulus
      Vaejovis norteno
      Vaejovis peninsularis
      Vaejovis platnicki
      Vaejovis pococki
      Vaejovis rubrimanus
      Vaejovis solegladi
      punctipalpi group
      Vaejovis bruneus bruneus
      Vaejovis bruneus loretoensis
      Vaejovis bruneus villosus
      Vaejovis cazieri
      Vaejovis crassimanus
      Vaejovis hirsuticauda
      Vaejovis insularis
      Vaejovis magdalensis
      Vaejovis punctipalpi punctipalpi
      Vaejovis punctipalpi barbatus
      Vaejovis punctipalpi cerralvensis
      Vaejovis russelli
      Vaejovis sonorae
      incertae sedis
      Vaejovis acapulco
      Vaejovis cisnerosi
           Vaejovis kuarapu
      Vaejovis mumai
      Vaejovis nayarit
      Vaejovis pequeno
      Vaejovis spicatus
      Vaejovis zihuatanejensis
          "Vaejovis" flavescens

Genus Vejovoidus

Catalog of the VaejovidaeVaejovid  Bibliography

Why Study the Vaejovidae?

Vaejovis nigrescens Pocock 1898

Vaejovis nigrescens Pocock, 1898: 396; Sissom & Francke, 1985: 244, 249-253, 255, fig. 14-23; Sissom, 1991b: 10, 17, 22, 24, fig. 75, 76; Kovarík, 1998: 147; Beutelspacher, 2000: 100, 136, 140, 141 (part), 142 (part), 145 (part), 148, 153, map 78; Ponce Saavedra & Beutelspacher, 2001: 46, 48, 49, 78, 101, Maps 22, 23; Sissom, 2000: 546; Soleglad & Fet, 2003a: 8, fig. 71; Sissom & González Santillán 2004: 5, 7; Soleglad & Fet, 2005: 11, Fig. 7, Table 1..
Vejovis nitidulus
(MIS; part): Kraepelin, 1899: 185, 186; Kraepelin, 1901: 274 (part).
Vaejovis nitidulus
(MIS): Pocock, 1902: 12-13, pl. III, fig. 3, 3a-c.
Vejovis nitidulus nigrescens
(part): Hoffmann, 1931: 365-368, fig. 27 (“records” from Guanajuato, Jalisco, Michoacán, Aguascalientes, Zacatecas); Hoffmann, 1937: 204; Hoffmann, 1938: 318; Gertsch, 1958: 5; Díaz Najera, 1964: 20, 25, 29.
Vaejovis nitidulus nigrescens
(part): Díaz Najera, 1975: 7, 22, 26, 34.
Vaejovis nitidulus nitidulus
(MIS; part): Díaz Najera, 1975: 23 (record from León, Guanajuato only).

HOLOTYPE:  Vaejovis nigrescens Pocock Holotype: F (BMNH), “México”.

Original description:  Vaejovis nigrescens Pocock, 1898: 396

Subsequent Accounts

distribution: NORTH AMERICA. México (Aguascalientes, Guanajuato, Jalisco, Querétaro, Estado de México, Michoacán, Zacatecas).

Published Records:  

notes: Beutelspacher's (2000) record of this species from Hidalgo are based on misidentifications of V. nitidulus; his records from Morelos, Oaxaca, and Puebla are probably all erroneous. The listing of the species from Distrito Federal by Sissom (1991, 2000) was based on the suggestion that Hoffmann's specimens of V. nitidulus intermedius were misidentified as V. nigrescens. Alternately, E. González Santillán (pers. observation) suggests the specimens are V. mexicanus mexicanus or are mislabeled. The specimens are apparently lost.

Vaejovis nigrescens Pocock

(Figs. 14-23)

Vaejovis nigrescens Pocock 1898: 396.
Vejovis nitidulus,
Kraepelin 1899: 186 (part); 1901: 274 (part).
Vaejovis nitidulus,
Pocock 1902: 12.
Vejovis nitidulus nigrescens,
Hoffmann 1931: 365, 1937: 204, 1939: 318; Gertsch 1958: 5.
Vaejovis nitidulus nigrescens,
Diaz Najera 1964:20, 24, 25, 29; 1975 : 7, 22, 25, 26, 30, 34.

Type data.—Adult female holotype from Mexico (no date or collector); deposited in the British Museum (Natural History); examined. The holotype, formerly a pinned specimen, is in poor condition: metasomal segments II-V and the telson are detached from the body and held together with a pin ; the right pedipalp, its movable finger, and most of the legs are also detached; the pectines are shriveled and broken; and the specimen is strongly discolored.

Distribution.—The specimens we have examined are from the central Mexican states of Aguascalientes, Distrito Federal, and Guanajuato. Hoffmann (1931, 1937) and Diaz Najera (1964, 1975) record V. nigrescens additionally from Hidalgo, Queretaro, and adjacent parts of Jalisco, Michoacan, San Luis Potosi, and Zacatecas. As in the case of V. intermedius, these records need to be verified. We have also examined a series of specimens from Dinamita, Durango collected by Duges; this record is far outside the range of nigrescens (including the records of Hoffmann and Diaz Najera) and may possibly be the result of a labeling error.

Diagnosis.—Adults 42-68 mm in length . Base color orange brown to reddish brown with variable faint underlying dusky markings. Sternite VII with submedian keels obsolete; lateral keels weak to moderate, granular. Metasomal segments I-II wider than long, III as long s wide, V less than twice as long as wide; ventrolateral carinae of I-IV weak, smooth to finely granular; ventral submedian carinae obsolete. Pedipalp: tibia with 14 trichobothria (3 et, 1 est, 2 em, 2 esb, 5 eb, 1 v) on external face; fixed finger of chela with primary row of denticles broken into six subrows by five enlarged denticles; femur as long as

carapace ; dorsointernal Carina of chela with eak to moderate, rounded granules .

Pectinal tooth count 19-21 in males ; 17-21 in emales .

Vaejovis nigrescens is most similar to V. i termedius. For comparisons between

these two species, see the diagnosis of the latter species .

Redescription .-The following redescripton is based on adult males an d

females. Parenthetical statements refer to females . Measurements of the female

holotype and an adult male appear in Table 1 .

Coloration. Base color of carapace and tergites orange brown to reddish

brown, with faint underlying dusky markings . Venter yellow brown to orange

brown; third sternite in males with whitish patch along posteriomedial margin

(absent). Metasomal segments I-III orange brown to reddish brown, IV-V dark

reddish brown . Telson reddish brown, with dark brown aculeus . Chelicerae yellow

brown at base, mottled with brown distally; teeth brown. Pedipalps: Femur and

tibia yellow brown to orange brown withcarinae somewhat darkened ; chel a

manus reddish brown to dark orange brown ; fingers dark brown basally, reddis h

brown to dark orange brown distally . Legs yellow to orange brown, usuall y

lighter than body. Pectines whitish .

Prosoma. Carapace slightly longer than wide . Median ocular prominence only

slightly raised above carapacial surface . Three pairs of lateral eyes, diameter o f



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