Mesabolivar serrapelada, Huber, 2018

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 : 83

Mesabolivar serrapelada sp. n.

Figs 320–321 , 334–339 , 349–351

Diagnosis. Easily distinguished from known congeners by shape of procursus ( Figs 334–335 ; distinctive hinged distal sclerite and large prolateral sclerite) and by shape of epigynum ( Figs 337–338 , 349–350 ; anterior plate with strongly protruding process carrying pocket at tip).

Etymology. The specific name is derived from the type locality; noun in apposition.

Type material. BRAZIL: Pará: ♂ holotype, 1♀ paratype, UFMG (21516–17), 1♂ 2♀ paratypes, ZFMK (Ar 19168), Serra Pelada (5.931°S, 49.674°W), 140 m a.s.l., rocky hill, 9.x.2016 (B.A. Huber, L.S. Carvalho).

Other material examined. BRAZIL: Pará: 1♀ 1 juv. in pure ethanol, ZFMK (Br16-243), same data as types.

Piauí: 3♂ 4♀ in pure ethanol, UFPI (ARA 277, 294), Alvorada do Gurguéia, Fazenda Escola da Universidade Federal do Piauí (8.375°S, 43.692°W), 15–17.ii.2012 (L.S. Carvalho). 1♀ in pure ethanol, UFPI (ARA 281), Coronel José Dias, Parque Nacional da Serra da Capivara [~ 8.8°S, 42.5°W], 26.ii.2012 (L.S. Carvalho); 1♂ in pure ethanol, UFPI (ARA 283), Coronel José Dias, Parque Nacional da Serra da Capivara, near Desfiladero das Andorinhas (8.767°S, 42.478°W), 6.vi.2011 (L.S. Carvalho). 1♂ in pure ethanol, UFPI (ARA 273), Castelo do Piauí, Parque Municipal da Pedra de Castelo (5.202°S, 41.687°W), 23.vii.2012 (L.S. Carvalho).

Description. Male (holotype)

MEASUREMENTS. Total body length 3.2, carapace width 1.15. Distance PME-PME 130 µm, diameter PME 100 µm, distance PME-ALE 100 µm, distance AME-AME 30 µm, diameter AME 60 µm. Sternum width/length: 0.75/ 0.55. Leg 1: 31.2 (8.4 + 0.5 + 8.1 + 12.4 + 1.8), tibia 2: 5.3, tibia 3: 4.1, tibia 4: 5.2; tibia 1 L/d: 65. Femora 1–4 width (at half length): 0.19, 0.17, 0.15, 0.16.

COLOR (in ethanol). Carapace pale ochre-yellow, with brown median band including posterior part of ocular area; clypeus with light brown mark in lower part; sternum orange; legs pale ochre to light brown, with slightly darker rings on femora (subdistally) and tibiae (proximally and subdistally), tips of femora and tibiae whitish; abdomen greenish gray, dorsally and laterally densely covered with dark internal marks, ventrally with orange plate in front of gonopore, dark internal median band behind gonopore.

BODY. Habitus as in Fig. 320 ; ocular area raised; carapace with distinct median furrow; clypeus unmodified; sternum unmodified.

CHELICERAE. With pair of simple apophyses close to laminae ( Fig. 336 ).

PALPS. As in Figs 334–335 ; coxa with retrolateral apophysis; trochanter barely modified; femur with rounded retrolateral process proximally, distally widening; procursus slightly curved, with distinctive hinged distal sclerite and large prolateral sclerite; genital bulb with long and slender bulbal process, mostly weakly sclerotized.

LEGS. With spines in several rows ventrally on femora and tibiae 1 and 2; without curved hairs, few vertical hairs; retrolateral trichobothrium on tibia 1 at 2%; prolateral trichobothrium present on tibia 1; tarsus 1 with ~25 pseudosegments, distally fairly distinct.

Male (variation). Tibia 1 in three other males: 8.5, 8.6, 9.7.

Female. In general similar to male but legs without spines and sternum color variable (orange like in males or dark brown). Tibia 1 in six females: 5.1–7.4 (mean 6.5). Epigynum as in Figs 337–338 , 349–350 ; anterior plate trapezoidal, with strongly protruding posterior process carrying pocket at tip; posterior plate simple. Internal genitalia as in Figs 339 , 351 , with large pore-plates and distinctive median folds protruding into body cavity.

Natural history. At the type locality, the spiders were found in domed webs among and under rocks on the dry hillside; they were absent from the forested area close to a little stream.

Distribution. Apparently widely distributed in northeastern Brazil (eastern Pará to Piauí) ( Fig. 734 ).

Figures

FIGURE 734. Known distributions of the Mesabolivar spinulosus group and of the M.bonita group.

FIGURES 315–326. Live specimens and habitus photos, Mesabolivar spinulosus group and M. xingu group. 315–318. M. spinulosus (Mello-Leitão, 1939), males from Campina Grande and Furna Feia Cave, females from Queimadas and Pinga Cave (feeding on caterpillar).319. M.murici sp. n., male from Murici. 320–321. M. serrapeladasp. n., male and female from Serra Pelada.322.M.amanayesp.n., male fromMarabá (ZFMK Ar19169).323–324.M.guaycolecsp.n.,male in dorsalandlateral views (CAS 9027305). 325–326.M.rudilapsi Machado et al., 2007, male and female from St. Hilaire/Lange.

FIGURES 334–339. Mesabolivar serrapelada sp. n. (ZFMK Ar 19168). 334–335. Left male palp, prolateral and retrolateral views. 336.Male chelicerae, frontal view. 337–338. Epigynum, ventral and lateral views.339. Cleared female genitalia, dorsal view.Scale lines:0.5 (334–335), 0.3 (336–339).

FIGURES 340–351. Female epigyna in ventral and lateral views and cleared female genitalia in dorsal views, Mesabolivar spinulosus group. 340–345. M. spinulosus (Mello-Leitão, 1939), from Mata do Amém (340–341, at same scale, ZFMK Ar 19153), Piauí (342, UFPI, ARA 300), near João Câmara (343–344, at same scale, ZFMK Ar 19156), Morro de Pedra (345, ZFMK Br15-181). 346–348. M. murici sp. n. (ZFMK Ar 19162). 349–351. M. serrapeladasp. n. (ZFMK Ar 19168).