Mesabolivar murici, 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 : 81-83

Mesabolivar murici sp. n.

Figs 319 , 327–333 , 346–348

Diagnosis. Distinguished from known congeners by distal elements of procursus ( Figs 327–328, 331 ; subdistal heavily sclerotized elements and distal partly membranous process), by armature of male chelicerae ( Figs 329–330 ; large proximal whitish processes and pointed apophyses distally near median line) and shape of epigynum ( Figs 332 , 346 ; simple anterior plate with median pocket and lateral whitish areas, large posterior plate).

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

Type material. BRAZIL: Alagoas: ♂ holotype, 1♀ paratype, UFMG (21514–15), 9♂ 10♀ paratypes, ZFMK (Ar 19162), near Murici, Estação Ecológica de Murici (9°14.8’S, 35°50.3’W), 350–400 m a.s.l., 18.v.2015 (B.A. Huber, L.S. Carvalho).

Other material examined. BRAZIL: Alagoas: 2♂ 4♀, ZFMK ( Ar 19163), same locality as types but at 9°15.0’S, 35°51.2’W, 200 m a.s.l., 19.v.2015 (B.A. Huber, L.S. Carvalho) . 2♀, ZFMK (Ar 19164), Reserva Biológica de Pedra Talhada (9°14.5’–14.0’S, 36°26.5’–27.2’W), 650–700 m a.s.l., 20–21.v.2015 (B.A. Huber, L.S. Carvalho) . 2♂ 1♀, ZFMK (Ar 19165), Usina Serra Grande , forest above sugarcane plantations (8°58.3’S, 36°05.7’W), 450–550 m a.s.l., 22–23.v.2015 (B.A. Huber, L.S. Carvalho).

Pernambuco: 4♂ 5♀, ZFMK (Ar 19166), near Bonito, forest near Cachoeira da Gruta (8°32.8’S, 35°42.7’W), 380 m a.s.l., 24–25.v.2015 (B.A. Huber, L.S. Carvalho) ; 1♀ in pure ethanol, ZFMK (Br 15-218), same data . 3♂ 2♀, ZFMK (Ar 19167), near Bonito, Alto da Serra (8°30.7’S, 35°34.3’W), at buildings, 750–800 m a.s.l., 24–25.v.2015 (B.A. Huber, L.S. Carvalho).

Description. Male (holotype)

MEASUREMENTS. Total body length 5.2, carapace width 2.4. Distance PME-PME 190 µm, diameter PME 190 µm, distance PME-ALE 150 µm, distance AME-AME 50 µm, diameter AME 90 µm. Sternum width/length: 1.65/ 0.90. Leg 1: 72.2 (18.8 + 0.9 + 17.5 + 29.6 + 3.5), tibia 2: 12.7, tibia 3: 9.7, tibia 4: 11.5; tibia 1 L/d: 80. Femora 1– 4 width (at half length): 0.39, 0.39, 0.38, 0.35.

COLOR (in ethanol). Carapace ochre, with large dark median mark including ocular area; clypeus not darker; sternum ochre-yellow, slightly darker medially; legs dark brown, femora and tibiae distally lighter; abdomen greenish gray, dorsally and laterally with dark internal marks, ventrally with orange area in front of gonopore and ochre-yellow area in front of spinnerets.

BODY. Habitus as in Fig. 319 ; ocular area weakly raised; carapace with deep median furrow; clypeus unmodified; sternum unmodified.

CHELICERAE. With large proximal whitish processes and pointed apophyses distally near median line ( Figs 329–330 ).

PALPS. As in Figs 327–328 ; coxa with retrolateral apophysis; trochanter barely modified; femur with retrolateral process proximally, distally ventrally widening; tibia distally ventrally with rounded process; tarsus with retrolatero-dorsal processes carrying tarsal organ; procursus proximally simple, distally complex and distinctive, with apparently hinged prolateral element; genital bulb with large tapering process partly sclerotized.

LEGS. Densely covered with short hairs, with many short spines on femora and tibiae 1–3 on all sides (very few spines dorsally); without curved hairs, few vertical hairs; retrolateral trichobothrium on tibia 1 at 2.5%; prolateral trichobothrium present on tibia 1; tarsus 1 with>40 pseudosegments, distally fairly distinct.

Male (variation). Tibia 1 in 18 other males: 13.2–18.3 (mean 15.7). Smallest males with very few spines on legs.

Female. In general similar to male, also with spines on legs, especially on femora and tibiae 1–2. Tibia 1 in 23 females: 11.3–15.9 (mean 13.8). Epigynum as in Figs 332 , 346 ; anterior plate with small median process at anterior margin, with pocket and distinctive whitish lateral areas; posterior plate very large. Internal genitalia as in Figs 333 , 347–348 , with large roundish pore-plates and distinctive median structure.

Natural history. The spiders were found in cavities along road cuts and among tree roots close to the ground. On a large bamboo, the webs reached up to ~ 1 m above the ground.

Distribution. Known from several localities in Alagoas and Pernambuco states ( Brazil) ( 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 327–333. Mesabolivar murici sp. n. (ZFMK Ar 19162).327–328. Left male palp, prolateral and retrolateral views. 329–330. Male chelicerae, lateral and frontal views. 331. Left procursus, dorsal view. 332. Epigynum, ventral view. 333. Cleared female genitalia, dorsal view.Scale lines:0.5.

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).