Hemirrhagus chilango Pérez-Miles & Locht, 2003

Mendoza, Jorge I. & Francke, Oscar F., 2018, Five new cave-dwelling species of Hemirrhagus Simon 1903 (Araneae, Theraphosidae, Theraphosinae), with notes on the generic distribution and novel morphological features, Zootaxa 4407 (4), pp. 451-482 : 453-455

Hemirrhagus chilango Pérez-Miles & Locht, 2003

( Fig 1 )

Hemirrhagus chilango Pérez-Miles & Locht, 2003: 367 , figs. 1̄6 (D ♂); Mendoza, 2014: 642, f. 1A, 3A–I, 4A–D (m).

Type material: holotype ♂ LAAH, MEXICO: Pedregal de San Ángel , México DF 15-XI-1977, Col. A. Zaldivar. Examined .

Additional material examined: 2 ♀ CNAN-Ar 010254, MEXICO : Distrito Federal, Delegación Tlalpan, 750m al NNE de Valle del Tezontle, Ajusco, 05-VI-2014, Coll. I. Solano . 1 juvenile LAE, MEXICO : Pedregal de San Ángel , México DF 13-IX-1985, no coll. name ; 1 ♂ CNAN 3470 , MEXICO : Ciudad Universitaria , México DF X- 2002, no coll. name ; 1 ♂ CNAN 3485 , MEXICO : Pedregal de San Ángel , México DF 27-VII-2002, no coll. name ; 1 ♂ CNAN 4253 , MEXICO : Bosque del Ajusco , México DF 20-VIII-2012, Col. F. Torres ; 1 ♂ CNAN 4252 , MEXICO : IBUNAM Ciudad Universitaria , México DF 13-IX-2012, Coll. J. Cruz.

Diagnosis. Hemirrhagus chilango can be distinguished from most other known Hemirrhagus species in having the urticating setae arranged in two lateral patches. From H. perezmilesi and Hemirrhagus billsteelei sp. nov. by tibial apophyses well developed. Differs from H. valdezi and H. lochti by oval patches of urticating setae with welldefined margins rather than diffuse, and metatarsus I straight rather than curved.

Hemirrhagus chilango is identified by possessing the following character combination: male palpal bulb with slender embolus similar in length to tegulum; subapical keel ends at embolus base; ventral groove deep. Embolus strongly curved retrolaterally on distal half. Ocular tubercle and eyes normally developed, periocular pigmentation complete ( Fig. 1E ). Labial cuspules are highly variable, ranging from 16-38. Urticating setae arranged in two lateral, oval patches, black in color, with well-defined margins ( Fig. 1C, D ). Spermatheca paired slightly fused at the base, receptacles finger-shaped, wider towards the base and bent laterally with strong curvature in the external edge ( Fig 1G ).

Description. Female CNAN-Ar 010254 A: body length 25.23, carapace 11.76 long, 10.55 wide. Caput slightly elevated; fovea straight, width 1.67 ( Fig 1A ).

Eyes: anterior eye row recurved, posterior eye row recurved. Periocular pigmentation complete, all eyes normally developed. Eye sizes and interocular distances: AME 0.30; ALE 0.35; PME 0.225; PLE 0.375; AME- AME 0.20; AME-ALE 0.225; PME-PME 0.90; PME-PLE 0.175; ALE-PLE 0.25. Ocular tubercle well developed, ocular quadrangle width 2.03, length 1.50; clypeus absent ( Fig 1E ). Labium length 2.0, width 2.27; with 24 cuspules. Maxilla inner corner with ~104 (left) and ~89 (right) cuspules ( Fig 1F ). Cheliceral promargin with 11 (left) and 10 (right) teeth (proximal to distal: first-second big, third-eigth medium, ninth-tenth big, eleventh small; first small, second big, third small, fourth-sixth medium, seventh-eleventh big). Sternum length 4.25. Sigillae oval, first, second and third pairs hardly visible, posterior sigilla once its length from the margin ( Fig 1B ).

Leg formula: IV, I, III, II. Length of legs and palpal segments (femur, patella, tibia, metatarsus, tarsus, total): I: 8.56, 5.47, 6.98, 6.58, 4.46, 32.05. II: 8.21, 4.76, 5.97, 6.19, 4.64, 29.77. III: 7.79, 4.29, 5.90, 7.50, 5.19, 30.67. IV: 9.84, 5.24, 7.70, 10.51, 5.96, 39.25. Palp: 7.05, 3.91, 5.35, -, 5.03, 21.34. Spinnerets: PMS, 1.33 long, 1.0 apart; PLS, 1.75 basal, 1.0 middle, 1.70 distal. Midwidths, 0.77 basal, 0.70 middle, 0.43 distal.

Scopulae: Tarsi I-IV entirely scopulated, III divided by narrow band of setae and IV divided by narrow band of setae. Metatarsi I-II densely scopulate; III 50 % scopulated distally and IV 30 % scopulated distally.

Stridulatory setae: with plumose setae on palp coxa retrolateral face, trochanter retrolateral face, femur prolateral and retrolateral faces; leg I coxa prolateral face, trochanter prolateral face, femur prolateral face; leg II femur prolateral face.

Chaetotaxy (left side): femora II 1 p; III 3 p, 2r; IV 1 p, 2r; palp 1p; patellae none; tibiae I 2 p, 7v; II 1 p, 7v; III 2 p, 8v, 2r; IV 3 p, 9v, 5r; palp 1p, 8v; metatarsi I 1v; II 3v; III 3 p, 8v, 3r; IV 3 p, 11v, 7r.

Genitalia: spermatheca paired, slightly fused at the base, receptacles finger-shaped, wider towards the base and bent laterally with strong curvature in the external edge. 2.0 width at the base ( Fig 1G ).

Urticating setae: Type VI arranged in two lateral, oval patches, black in color, with well-defined margins ( Fig 1C, D ).

Color pattern: in ethanol specimens color are brown. Live specimens are dark brown.

Distribution and natural history: Known only from Mexico City ( Fig 22 ), inhabits shrubland and pine forest from Pedregal de San Angel to Ajusco which is part of the Neovolcanic axis.

Figures

FIGURE 22. Known distribution of Hemirrhagus stygius (Gertsch 1971), Hemirrhagus elliotti (Gertsch 1973), Hemirrhagus embolulatus Mendoza 2014, Hemirrhagus eros Pérez-Miles & Locht 2003, Hemirrhagus chilango Pérez-Miles & Locht 2003, Hemirrhagus lochti Estrada-Alvarez 2014, Hemirrhagus sprousei new species, Hemirrhagus kalebi new species, Hemirrhagus nahuanus(Gertsch 1982), Hemirrhagus papalotl Pérez-Miles &Locht 2003, Hemirrhagusgrieta(Gertsch 1982),Hemirrhagus coztic Pérez-Miles & Locht 2003 and Hemirrhagus perezmilesi García-Villafuerte & Locht 2010. Showing the biogeographic provinces where they are found. SMO= Sierra Madre Oriental, EVT= Eje Volcanico Transversal, SMS= Sierra Madre del Sur, PCH= Provincia de Chiapas.

FIGURE1. A─G, Hemirrhagus chilango Pérez-Miles &Locht 2003, female CNAN- Ar010254A.A, carapace, dorsal view. B, prosoma, ventral view showing the retrolateral projection on coxae of all legs (arrows show this feature only on coxa of third and fourth leg). C, opisthosoma, dorsal view. D, opisthosoma, lateral view. E, ocular tubercle, dorsal view. F, labial and maxillary cuspules. G, spermathecae, ventral view.Scale = 4mm (B̅D), 2mm (A, F), 1mm (E), 0.5mm (G).