Trachelas ductonuda, Rivera-Quiroz, F. Andrés & Alvarez-Padilla, Fernando, 2015

Rivera-Quiroz, F. Andrés & Alvarez-Padilla, Fernando, 2015, Three new species of the genus Trachelas (Araneae: Trachelidae) from an oak forest inside the Mesoamerican biodiversity hotspot in Mexico, Zootaxa 3999 (1), pp. 95-110 : 100-102

Trachelas ductonuda sp. n.

Figures 18–34

Type material. ♂ holotype: MEXICO: Veracruz: Atotonilco de Calcahualco, near the Pico de Orizaba National Park (19°08'17.4"N, 97°12'16.2"W, 2 300 m), collected 4–14 October 2012 by U. Garcilazo-Cruz (CAFC-UNAM).

♀ allotype from the same locality, collected 15–24 February 2013 by F. Alvarez-Padilla (CAFC-UNAM).

Other material examined: N = 2. MEXICO: Veracruz: Atotonilco de Calcahualco, Plot II, 19°08'17.4"N, 97°12'16.2"W, 2 300 m, 4–14 October 2012, 1♂ (CAFC-UNAM); 15–24 February 2013, 1♀ (CAFC-UNAM).

Etymology. The species epithet, a noun in apposition, from the Latin ducto (duct) and nudum (tangle) refers to the extremely convoluted copulation duct.

Diagnosis. The male of T. ductonuda sp. n. is similar to T. latus and T. hamatus in the E hook-shaped and the size of the palpal tibia in relation to the cymbium. Differs from these species by the E having a thicker base and longer hook ( Fig. 34 ; Platnick & Shadab 1974a: fig. 84) and by having a straight RTA instead of hooked in a ventral view ( Fig. 34 ; Platnick & Shadab 1974a: fig. 80) respectively. Female genitalia is similar to T. spinulatus F.O. P.-Cambridge 1899 and T. latus by having asymmetrical and complexly coiled CD, FD relatively straight and uncoiled, and Ss smaller than the S. It differs from these two species by having longer CD, S oval and considerably wider than the Ss, and atrium with two asymmetric genital openings ( Figs 30, 31 ; Platnick & Shadab 1974a: figs 78, 79, 82, 83).

Description. Male: Total length 6.63. Cephalothorax: 2.8 long. Carapace glabrous, without pattern, dark uniform coloration ( Fig. 19 ). Lateral and dorsal surfaces same coloration, cephalic area higher than thoracic ( Fig. 21 ). Sternum same color as carapace ( Fig. 23 ). AME closer together than to ALE. Clypeus about one diameter of AME. All eyes subequal in size ( Fig. 18 ). AER straight, PER procurved in dorsal view. Endites same color as coxa I. Labium same color as carapace, longer than wide, labium about 3/4 of endite length. Chelicera same color as carapace, greatly sclerotized, with rugose cuticle. Three promarginal and two retromarginal teeth. Abdomen: 2.8 long, background pale grey. Dorsal surface without scutum, pattern with an anterior longitudinal dark mark and reticulated clearer patches ( Fig. 19 ). Ventral surface with a darker median rectangular area. Epigastric area and book lung covers pale yellow, slightly sclerotized, middle section darker grey ( Fig. 23 ). Leg formula I-II-IV-III, light yellow, first pair brown. Twenty-three VCT, 27 VCM. Pedipalp and bulb yellow ( Figs 20, 22 ). Tibia short about 0.3 times length of cymbium. RTA large, about 0.4 times width of tibia. E hooked with no basal coil ( Figs 32–34 ).

Female: as in male except as noted ( Figs 25, 27, 29 ). Total length 7.5. Cephalothorax: 3.5 long. Sternum rugose, same color as carapace ( Fig. 29 ). Abdomen: 3.8 long. Five VCT, 8 VCM. Epigynum reddish, cuticle semitransparent, atrium with two separated and asymmetrical CO on middle portion ( Fig. 26 ); CD extremely long and slender, irregularly coiled ( Figs 28 , 30–31 ).

Distribution. Known only from the type locality ( Fig. 52 ).

Biology. Both type specimens were collected in a Quercus forest with secondary plant growth. Adult specimens were found in October 2012 and February 2013. Specimens were caught by beating and direct collecting over vegetation.

Figures

FIGURE 52. Map of the locality where T. crassus, T. ductonuda and T. odoreus were collected near Pico de Orizaba (Veracruz) marked with an X. Scale bar = 200 km.

FIGURES 18 – 23. Trachelas ductonuda sp. n., male. 18 Prosoma, anterior view; 19 Habitus, dorsal view; 20 Palp, retrolateral view; 21 Habitus, lateral view; 22 Palp, ventral view; 23 Habitus, ventral view. Scale bars: 18, 19, 21, 23 = 1.0 mm; 20, 22 = 0.2 mm.

FIGURES 24 – 29. Trachelas ductonuda sp. n., female. 24 Prosoma, anterior view; 25 Habitus, dorsal view; 26 Epigynum, ventral view; 27 Habitus, lateral view; 28 Epigynum, dorsal view; 29 Habitus, ventral view. Scale bars: 24, 26 = 0.5 mm; 25, 27, 29 = 1.0 mm; 28 = 0.2 mm.

FIGURES 30 – 34. Trachelas ductonuda sp. n., genitalia. 30 Epigynum, cleared ventral view; 31 Same, dorsal view; 32 Palp, prolateral view; 33 Same, retrolateral view; 34 Same, ventral view. Scale bars: 30, 31 = 0.1 mm; 32 – 34 = 0.2 mm.