Mesabolivar amanaye,

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

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Mesabolivar amanaye

sp. n.

Mesabolivar amanaye  sp. n.

Figs 322View FIGURES 315–326, 352–358View FIGURES 352–358, 369–371View FIGURES 369–377

Diagnosis. Easily distinguished from most known congeners by strong ridges ventrally on procursus ( Fig. 353View FIGURES 352–358); 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. 355View FIGURES 352–358 and Huber 2000: fig. 904). Females differ from congeners by shape of epigynum ( Figs 356–357View FIGURES 352–358): 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. 322View FIGURES 315–326; 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 354–355View FIGURES 352–358).

PALPS. As in Figs 352–353View FIGURES 352–358; 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 356–357View FIGURES 352–358, 369– 370View FIGURES 369–377; anterior plate strongly protruding, with pocket on median process and pair of small lateral processes; posterior plate simple. Internal genitalia as in Figs 358View FIGURES 352–358, 371View FIGURES 369–377, 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. 735View FIGURE 735).


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