Mesabolivar charrua Machado et al., 2013

Huber, Bernhard A., 2018, The South American spider genera Mesabolivar and Carapoia (Araneae, Pholcidae): new species and a framework for redrawing generic limits, Zootaxa 4395 (1), pp. 1-178 : 98

Mesabolivar charrua Machado et al., 2013

Figs 384–385 , 439–440

Mesabolivar charrua Machado et al., 2013: 404 , figs 15–30 (♂ ♀, Uruguay, Brazil). Huber 2015: 59.

Type material. URUGUAY: ♂ holotype, 1♀ paratype, FCE (2361), Maldonado, Sierra de Ánimas (34°42’S, 55°20’W), 18.vi.1950 (L.C. de Zolessi), not examined. Further paratypes from other localities in Uruguay and Brazil, see Machado et al. (2013).

New records. BRAZIL: Santa Catarina: 9♂ 6♀, ZFMK ( Ar 19184), Serra Geral National Park, Churriado Canyon (29.137°S, 49.953°W to 29.130°S, 49.965°W), forest near river, 150–250 m a.s.l., 20.x.2014 (B.A. Huber, L.S. Carvalho) ; 3♀ in pure ethanol, ZFMK (Br 14-163), same data . 1♂, ZFMK (Ar 19185), Aparados da Serra National Park, forest at southern margin of Itaimbezinho Canyon (29.161°S, 50.080°W), 940 m a.s.l., 22.x.2014 (B.A. Huber, L.S. Carvalho) ; 1♀ in pure ethanol, ZFMK (Br 14-174), same data . Rio Grande do Sul: 2♂ 2♀, ZFMK (Ar 19186), São Francisco de Paula National Forest (29.430°S, 50.392°W), 890 m a.s.l., 23.x.2014 (B.A. Huber, L.S. Carvalho) ; 1♂ 1♀ in pure ethanol, ZFMK (Br 14-182), same data . 2♂ 3♀, ZFMK (Ar 19187), Canela National Forest (29.321°S, 50.818°W), 790 m a.s.l., 24.x.2014 (B.A. Huber, L.S. Carvalho) ; 2♀ in pure ethanol, ZFMK (Br 14-187), same data ; 1♂ 3♀, ZFMK (Ar 19188), same data but night collecting.

Description (amendments; see Machado et al. 2013). Tibia 1 in 14 newly examined males: 10.0–13.7 (mean 12.4); in 11 females: 9.1–11.2 (mean 9.8). Tibia 1 L/d in two males: 78, 81; male leg femora 2 and 3 wider in large males (diameters femora 1–4 in 2 males: 0.25, 0.29, 0.28, 0.25; 0.19, 0.19, 0.19, 0.18). Male legs sometimes with short spine-like hairs dorsally on tibiae and metatarsi (specimens from Canela). Prolateral trichobothrium present on tibia 1. Male eye measures: distance PME-PME 160 µm, diameter PME 160 µm, distance PME-ALE 130 µm, distance AME-AME 25 µm, diameter AME 70 µm. Prolateral sclerite on procursus appears rather pointed in prolateral view (fig. 19 in Machado et al. 2013 shows the tip of the procursus in rather ventral view, and the prolateral sclerite is shown as being uniformly sclerotized while in all specimens above it is only partly sclerotized and thus appears pointed rather than obtuse). Carapace in males and females with dark brown, wide median band, with indistinct light brown lateral marginal bands. Sternum in males and females orange rather than brown. Large males with very dark brown legs. Epigynal processes in newly examined females variable but slightly smaller than shown in Machado et al. (2013: fig. 23).

Natural history. The spiders were found in domed webs among tree roots and rocks close to the ground. When disturbed, they started swinging with large amplitude.

Distribution. Widely distributed in Uruguay and southern Brazil ( Machado et al. 2013; Fig. 736 ).

Figures

FIGURES378–389. Live specimens,Mesabolivar iguazugroup.378–379.M.chapeco sp. n., male and female from Chapecó. 380–381. M. yucuma sp. n., male and female from Turvo. 382–383. M. iguazu Huber, 2000, males from Iguaçú. 384–385. M. charruaMachado etal., 2013, male andfemale from Serra Geral. 386–387.M.catarinensis sp. n., male and female from Serra Geral.388–389. M. bicuspis sp. n., male and female from St. Hilaire/Lange.

FIGURES 433–446. Female epigyna in ventral and lateral views and cleared female genitalia in dorsal views, Mesabolivar iguazu group. 433.M. chapeco sp. n. (ZFMK Ar 19175). 434–436. M.yucuma sp. n. (ZFMK Ar 19176). 437–438. M.iguazu Huber, 2000 (ZFMK Ar 19181). 439–440. M. charrua Machado et al., 2013 (ZFMK Ar 19184). 441–442. M. argentinensis (Mello-Leitão, 1938) (MACN Ar 20050). 443–445. M. catarinensis sp. n. (ZFMK Ar 19189). 446. M. bicuspis sp. n. (ZFMK Ar 19194).

FIGURES 736–737. Known distribution of the Mesabolivar iguazu group. TL, type locality. “?”: dubious northern records of M. uruguayensis in Machado et al. (2013) (cf. Huber 2015:60).