Mesabolivar amadoi, 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 : 76-79

Mesabolivar amadoi sp. n.

Figs 306–314

Diagnosis. Easily distinguished from most known congeners by armature of male chelicerae ( Figs 310–311 ; two pairs of frontal apophyses), tip of procursus ( Figs 308–309 ; distinctive shape of prolateral process), and shape of epigynum ( Figs 312–313 ; anterior plate with large central whitish depression and pair of apophyses); from most similar known species ( M. bonita ) by apophyses on epigynum (absent in M. bonita ) and by positions and sizes of male cheliceral apophyses (proximal apophyses smaller; distal apophyses in more proximal position).

Etymology. Named for Jorge Amado (1912–2001), Brazilian writer, author of Gabriela, Cravo e Canela.

Type material. BRAZIL: Bahia: ♂ holotype, 1♀ paratype, MNRJ (14319), 14♂ 10♀ paratypes, ZFMK (Ar 19147–48), Reserva Particular do Patrimônio Natural Serra Bonita (15°23.3’–23.4’S, 39°33.7’–34.0’W), ~ 750– 850 m a.s.l., 2–3.x.2011 (B.A. Huber, A. Pérez-González, M. Alves Dias).

Other material examined. BRAZIL: Bahia: 1♂ 9♀ in pure ethanol, ZFMK (Br11-161), same data as types.

Espírito Santo: 3♂ 16♀ 1 juv., ZFMK (Ar 19149–50), Reserva Biológica de Sooretama , ‘site 1’ (19°03.3’S, 40°08.8’W), ~ 90 m a.s.l., 27.ix.2011 (B.A. Huber, A. Pérez-González) ; 6♀ in pure ethanol, ZFMK (Br 11-126), same data .

Description. Male (holotype)

MEASUREMENTS. Total body length 3.3, carapace width 1.3. Distance PME-PME 130 µm, diameter PME 120 µm, distance PME-ALE 100 µm, distance AME-AME 30 µm, diameter AME 50 µm. Sternum width/length: 0.95/ 0.55. Leg 1: 38.7 (11.0 + 0.5 + 10.8 + 14.6 + 1.8), tibia 2: 7.6, tibia 3: 4.9, tibia 4: 7.3; tibia 1 L/d: 94. Femora 1–4 width (at half length): 0.14, 0.15, 0.22, 0.15.

COLOR (in ethanol). Prosoma and legs light brown, carapace with large dark median mark, clypeus not darker; tips of femora and tibiae lighter yellowish, legs without dark rings; abdomen greenish gray, dorsally and laterally densely covered with dark marks, ventrally with light brown area in front of gonopore.

BODY. Habitus as in putative close relatives ( M. bonita , M. pau ; cf. Huber 2015: figs 12–13); ocular area raised; carapace with distinct median furrow; clypeus unmodified; sternum unmodified.

CHELICERAE. With two pairs of frontal apophyses ( Figs 310–311 ), both pointed in lateral view, distal pair rounded in frontal view.

PALPS. As in Figs 306–307 ; apparently indistinguishable from M. bonita (direct comparison with M. bonita paratype); even details of procursus tip ( Figs 308–309 ) apparently identical.

LEGS. Without spines, without curved hairs, few vertical hairs; retrolateral trichobothrium on tibia 1 at 2%; prolateral trichobothrium present on tibia 1; tarsus 1 with>30 pseudosegments, distally fairly distinct.

Male (variation). Tibia 1 in 15 other males: 9.4–11.2 (mean 10.2).

Female. In general similar to male. Tibia 1 in 25 females: 5.9–8.5 (mean 7.0). Epigynum as in Figs 312–313 ; anterior plate with large central whitish depression bordered by posterior ridge and pair of apophyses near posterior margin; simple posterior plate. Internal genitalia as in Fig. 314 , with pair of large pore-plates in tent-shaped lateral position, converging anteriorly.

Natural history. The spiders were found in domed webs built in sheltered spaces close to the ground. Distribution. Known from two localities in Bahia and Espírito Santo states (Brazil) ( Fig. 734 ).

Figures

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

FIGURES306–311. Mesabolivaramadoi sp.n. (ZFMKAr 19147).306–307.Left male palp, prolateral and retrolateral views. 308–309.Tip of leftprocursus,prolateral and dorsalviews.310–311.Male chelicerae,lateral and frontalviews.Scale lines:0.5 (306–307, 310–311), 0.2 (308–309).

FIGURES 312–314. Mesabolivar amadoi sp. n. (ZFMK Ar 19148). 312–313. Epigynum, ventral and lateral views. 314. Cleared female genitalia, dorsal view.Scale lines:0.3.