Mesabolivar amanaye, 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 : 86

Mesabolivar amanaye sp. n.

Figs 322 , 352–358 , 369–371

Diagnosis. Easily distinguished from most known congeners by strong ridges ventrally on procursus ( Fig. 353 ); from the only similar known species ( M. xingu ) by armature of male chelicerae (pair of hooked proximal apophyses, only one pair of lateral apophyses; compare Fig. 355 and Huber 2000: fig. 904). Females differ from congeners by shape of epigynum ( Figs 356–357 ): strongly protruding, oval in ventral view, with pair of small humps and median pocket on process of posterior rim; the female of M. xingu is unknown.

Etymology. The specific name honors the Amanayé, a Tupi-Guaranian people in northeastern Brazil, living between the cities of Belém and Brasília in the state of Pará; noun in apposition.

Type material. BRAZIL: Pará: ♂ holotype, 1♀ paratype, UFMG (21518–19), 4♂ 3♀ paratypes, ZFMK (Ar 19169–70), Marabá, forest near road, ‘site 2’ (5.360°S, 49.058°W), 120 m a.s.l., 10–11.x.2016 (B.A. Huber, L.S. Carvalho).

Other material examined. BRAZIL: Pará: 2♂ 2♀ in pure ethanol, ZFMK (Br 16-244), same data as types . 2♀ in pure ethanol, ZFMK (Br16-239), Marabá, forest near road, ‘site 1’ (5.414°S, 49.074°W), 140 m a.s.l., 7– 8.x.2016 (B.A. Huber, L.S. Carvalho).

Description. Male (holotype)

MEASUREMENTS. Total body length 3.2, carapace width 1.45. Distance PME-PME 120 µm, diameter PME 120 µm, distance PME-ALE 80 µm, distance AME-AME 30 µm, diameter AME 55 µm. Sternum width/length: 0.95/ 0.60. Leg 1: 34.5 (9.1 + 0.5 + 9.0 + 14.0 + 1.9), tibia 2: 6.0, tibia 3: 4.5, tibia 4: 5.8; tibia 1 L/d: 67. Femora 1–4 width (at half length): 0.23, 0.24, 0.22, 0.21.

COLOR (in ethanol). Carapace ochre-yellow, with light brown margins and wide dark brown median band including ocular area; clypeus light brown; sternum ochre-yellow, labium light brown; legs brown, without dark rings, femora and tibiae distally lighter; abdomen greenish gray, dorsally and laterally densely covered with dark internal marks, ventrally with orange-brown plate in front of gonopore.

BODY. Habitus as in Fig. 322 ; ocular area raised; carapace with distinct median furrow; clypeus with sclerotized rim but otherwise unmodified; sternum unmodified.

CHELICERAE. With pair of diverging hooked apophyses proximally, pair of small pointed apophyses in midsection, and pair of straight apophyses distally close to laminae ( Figs 354–355 ).

PALPS. As in Figs 352–353 ; coxa with strong retrolateral apophysis curved towards distal; trochanter barely modified; femur with retrolateral process proximally, distally strongly widening; tibia-tarsus joints shifted in clockwise direction in distal view; tarsus with dorsal process; procursus with 8–9 strong ventral ridges, distally with membranous and sclerotized elements; genital bulb with distinct apophysis lodged at tarsal process, bulbal process mostly membranous, with rounded ventral hump at basis.

LEGS. Without spines and curved hairs, few vertical hairs; retrolateral trichobothrium on tibia 1 at 2%; prolateral trichobothrium present on tibia 1; tarsus 1 with ~25 pseudosegments, distally distinct.

Male (variation). Tibia 1 in four other males: 9.6, 10.1, 10.2, 10.2.

Female. In general similar to male. Tibia 1 in three females: 6.8, 7.7, 7.7. Epigynum as in Figs 356–357 , 369– 370 ; anterior plate strongly protruding, with pocket on median process and pair of small lateral processes; posterior plate simple. Internal genitalia as in Figs 358 , 371 , with large pore-plates.

Natural history. The spiders were found in sheltered spaces among tree buttresses.

Distribution. Known from type locality in Pará state ( Brazil) only ( Fig. 735 ).

Figures

FIGURE 735. Known distribution of the Mesabolivar xingu 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 352–358. Mesabolivar amanaye sp. n. (ZFMK Ar 19169–70). 352–353. Left male palp, prolateral and retrolateral views.354–355.Male chelicerae, lateral and frontal views.356–357.Epigynum, ventral and lateral views.358.Cleared female genitalia, dorsal view.Scale lines:0.5.

FIGURES 369–377. Female epigyna and cleared female genitalia, Mesabolivar xingu group. 369–371. M. amanaye sp. n., epigynum in ventral and lateral views, cleared female genitalia in dorsal views (ZFMK Ar 19170).372–373. M. guaycolec sp. n., epigynum in ventral view and cleared female genitalia in dorsal view (CAS 9027305). 374–377. M. rudilapsi Machado et al., 2007, epigynum in frontal, lateral and ventral views, and cleared female genitalia in dorsal view (ZFMK Ar19172).