Enna rioja, Cruz Da Silva, Estevam L., 2013

Cruz Da Silva, Estevam L., 2013, A new Peruvian species of Enna (Araneae, Lycosoidea, Trechaleidae), Zootaxa 3701 (4), pp. 467-470 : 467-470

Enna rioja new species

Figs 1–7

Type material: Holotype: female from San Martin, Rioja , Paitoja, Peru [06°03’S, 77°10’W], 10.X.2008, C. Albujar (MUSM 505344). Paratype: one female, same locality, date and collector as holotype, deposited at FMNH.

Etymology. The specific name is a noun in apposition taken from type locality.

Diagnosis. The female of E. rioja sp. nov. resembles those of E. baeza (Silva et al., 2008: 93, figs 78, 79) by the small rounded projection on the head of spermathecae (HS) and E. osaensis (Silva et al., 2012: 57, fig. 6) by the presence of a large accessory spermathecae ( AS) and by the shape of the projected scape (SC) of the middle field of the epigynum (MF), but can be distinguished from both species by the slightly projected lateral lobes (LL) ( Fig. 5 ) and by the large and conspicuous accessory spermathecae and by the elliptical shape of head of spermathecae (HS) ( Fig. 6 ).

Note. Ten species of Enna were described from Peru and Enna huanuco Silva, Lise & Carico, 2008 is the only one with the female still unknown. In this paper, the female from San Martin, Peru is described as separate species and not grouped with E. huanuco , since the locations where they have been found are not close together (San Martin and Huanuco , respectively), distant about 400km apart and males and females have not been collected together from the same area. Both species ( E. rioja sp. nov. and E. huanuco Silva, Lise & Carico, 2008 ) also present some morphological differences: carapace colouration ( E. huanuco is dark brown with lateral brownish bands and E. rioja sp. nov. has a dark brown carapace without bands) and carapace dimensions (most Enna males have a longer and wider carapace than females, but the female of E. rioja sp. nov. has a longer and wider carapace compared to the male specimen of E. huanuco ).

Description. Female (Holotype, San Martin, Peru, MUSM 505344). Total length 10.50. Carapace 5.58 long, 4.78 wide, dark brown, fovea marked ( Figs 1, 2 ). Clypeus dark brown, 0.46 high ( Fig. 4 ). Anterior eye row straight, 1.51 wide; posterior 2.35 wide ( Fig. 4 ). Eye diameters, interdistances, and median ocular quadrangle: AME 0.21, ALE 0.18, PME 0.31, PLE 0.18; AME-AME 0.18, AME-ALE 0.16, PME-PME 0.65, PME-PLE 0.49, OQA 0.65, OQP 1.20, OQH 0.71. Chelicerae reddish-brown, bristly ( Fig. 4 ); promargin and retromargin of fang furrow with three teeth equidistant and equal in size. Sternum yellow, with scattered setae ( Fig. 3 ); 2.66 long, 2.52 wide. Labium dark brown, yellow distally ( Fig. 3 ), 1.06 long, 0.93 wide. Legs light brown with dark brown annuli on femora ( Figs 1, 2 ), relative length: IV-I-II-III, I—femur 6.25/ tibia-patella 8.64/ metatarsus 6.65/ tarsus 2.66/ total 24.20; II—6.38/ 8.37/ 6.11/ 2.55/ 23.41; III—5.18/ 5.45/ 4.12/ 2.12/ 16.87; IV—6.65/ 7.98/ 7.31/ 2.92/ 24.85. Ventral pairs of macrosetae on tibiae: I–4; II–3; III–3; IV–3. Abdomen 4.92 long, gray with two pairs of sigillae ( Fig. 1 ). Venter light brown, bristly ( Fig. 3 ). Epigynum with a projected scape (SC) ( Fig. 5 ). Head of spermathecae (HS) rounded and with a rounded whitish projection ( Fig. 6 , HS). Accessory spermathecae conspicuous and rounded ( Fig. 6 , AS).

Distribution. Known only from the type locality ( Peru) ( Fig. 7 ).

Acknowledgments

I wish to thank Diana Silva-Dávila (MUSM) for the loan of the material. The images were taken in Petra Sierwald’s lab at the Field Museum, Robin Delapena (FMNH) graciously helped obtaining the photos of the female genitalia.

Figures

FIGURE 7. Type locality of Enna rioja sp. nov. in Peru.

FIGURES 1 – 6. Enna rioja sp. nov. Female habitus (1 dorsal, 2 lateral, 3 ventral, 4 frontal). Scale bar = 2 mm.