treatment provided by
Mesabolivar chapeco sp. n.
Mesabolivar iguazu: Huber 2014: 139 (only specimens from Puerto Libertad and Arroyo Uruguay km 30).
Diagnosis. Distinguished from similar congeners ( M. uruguayensis , M. iguazu , M. yucuma ) by long proximal processes on male chelicerae ( Figs 392–393View FIGURES 390–396; similar in M. iguazu , where distal apophyses are more prominent in lateral view); also by male procursus ( Figs 397–399View FIGURES 397–407; with distinctive distal sclerotized and membranous elements), and by shape of epigynum ( Figs 394–395View FIGURES 390–396, 433View FIGURES 433–446; anterior plate straight in lateral view, with pair of low processes and pocket on dark sclerotized process at posterior margin).
Etymology. The specific name is derived from the type locality; noun in apposition.
Type material. BRAZIL: Santa Catarina: ♂ holotype, 1♀ paratype, UFMG (21520–21), 4♂ 7♀ paratypes, ZFMK (Ar 19175), Chapecó National Forest (27.103°S, 52.779°W), 620 m a.s.l., 27.x.2014 (B.A. Huber, L.S. Carvalho).
Other material examined. BRAZIL: Santa Catarina: 3♀ in pure ethanol, ZFMK (Br14-193), same data as types.
Assigned tentatively. ARGENTINA: Misiones: 2♂ 2♀, MACN (Ar 4019), “ Pto. 17 de Octubre ” [ Puerto Libertad , 25°55’S, 54°36’W, 220 m], x.1953 (Schiapelli, De Carlo)GoogleMaps ; 1♂, MACN (Ar 4312), same data but xi.1954GoogleMaps . 5♂, MACN (Ar 2889, 2984, 3262), same data, “km 30”, xi.1949GoogleMaps – ii.1950 (J.A. Cranwell, Partridge ). 1♂, MACN (Ar 19962), Arroyo Uruguay, km 30 [25°52’S, 54°34’W, 200 m], date unreadable, leg. Partridge.GoogleMaps
Description. Male (holotype)
MEASUREMENTS. Total body length 3.8, carapace width 1.6. Distance PME-PME 130 µm, diameter PME 140 µm, distance PME-ALE 120 µm, distance AME-AME 40 µm, diameter AME 50 µm. Sternum width/length: 1.05/ 0.75. Leg 1: 42.3 (10.8 + 0.7 + 10.4 + 18.1 + 2.3), tibia 2: 6.8, tibia 3: 5.3, tibia 4: 6.9; tibia 1 L/d: 69. Femora 1–4 width (at half length): 0.26, 0.30, 0.30, 0.25.
COLOR (in ethanol). Carapace pale ochre-yellow with large dark median mark including ocular area and brown lateral margins; clypeus not darker; sternum pale orange; legs brown, tips of femora and tibiae lighter, without dark rings; abdomen greenish gray, with darker internal marks dorsally and laterally, ventrally with orange to light brown area in front of gonopore and indistinct plate in front of spinnerets.
BODY. Habitus as in Fig. 378View FIGURES378–389; ocular area raised; carapace with distinct median furrow; clypeus unmodified; sternum unmodified.
CHELICERAE. With pair of small apophyses distally close to median line and pair of distinctive long processes proximally ( Figs 392–393View FIGURES 390–396).
PALPS. As in Figs 390–391View FIGURES 390–396; coxa with distinctive retrolateral apophysis; trochanter barely modified; femur with retrolateral apophysis proximally, distally strongly widening; procursus weakly curved, with distinctive sclerotized and membranous elements distally ( Figs 397-399View FIGURES 397–407); genital bulb with long process partly sclerotized.
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 fairly distinct.
Male (variation). Tibia 1 in three other males from type locality: 9.9, 10.0, 10.1. Legs sometimes lighter, with subdistal darker rings. Males from Argentina (Puerto Libertad, Arroyo Uruguay) appear indistinguishable but are assigned tentatively because the females from Puerto Libertad appear slightly different (see below); tibia 1 in two males from Puerto Libertad: 9.6, 10.5.
Female. In general similar to male ( Fig. 379View FIGURES378–389). Tibia 1 in eight females from type locality: 7.1–7.7 (mean 7.6). Epigynum as in Figs 394–395View FIGURES 390–396, 433View FIGURES 433–446; anterior plate with pair of low processes and pocket on sclerotized process at posterior margin; posterior plate barely visible, reduced to pair of light brown marks. Internal genitalia as in Fig. 396View FIGURES 390–396, with pair of pore-plates in lateral position, converging anteriorly. Females from Puerto Libertad with slightly smaller epigynal humps; tibia 1: 6.0 (missing in second female).
Natural history. The spiders were abundant in sheltered spaces, usually close to the ground.
Distribution. Known from type locality in Santa Catarina state ( Brazil) and from Misiones ( Argentina) (Argentinean specimens assigned tentatively) ( Fig. 737View FIGURES 736–737).
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