The South American spider genera Mesabolivar and Carapoia (Araneae, Pholcidae): new species and a framework for redrawing generic limits Huber, Bernhard A. Zootaxa 2018 2018-03-19 4395 1 1 178 3ZXF5 Huber, 2018 Huber 2018 [151,422,1231,1257] Arachnida Pholcidae Mesabolivar GBIF Animalia Araneae 31 32 Arthropoda species tabatinga sp. nov.   Diagnosis.Easily distinguished from known congeners by armature of male chelicerae (pair of long frontal apophyses S-shaped in lateral view, Figs 117–118), by details of male palp (Figs 115–116; femur with ventro-distal protrusion, straight procursus with slender tip, bulbal process with bifid tip), by female pedipalp tibiae slightly widened, and by female external and internal genitalia (epigynum with pair of processes and anterior pocket, distinctive shape of pore-plates; Figs 119–121, 133–134).   Etymology.The specific name is derived from the typelocality; noun in apposition.    Typematerial. BRAZIL:  Amazonas: ♂ holotype, 1♀ paratype, UFMG(21507–08), 10♂ 30♀ paratypes, ZFMK(Ar 18991–92), forest near Tabatinga ( 4.244°S, 69.92– 69.93°W), 90 ma.s.l., 2–4.xi.2016(B.A. Huber, L.S. Carvalho).    Othermaterial examined. BRAZIL:  Amazonas: 1♂ 2♀in pure ethanol, ZFMK(Br16-329), same data as types.    Assignedtentatively. ECUADOR:  Orellana: 2♂, ZFMK( Ar18993–94), Yasuní Station[ 0.674°S, 76.398°W], botanical trail, night collecting,  4.xii.2009( P. Michalik; PM-EC-068/069).   Description. Male( holotype) MEASUREMENTS. Total body length 3.0, carapace width 1.35. Distance PME-PME 100 µm, diameter PME 140 µm, distance PME-ALE 90 µm, distance AME-AME 30 µm, diameter AME 40 µm. Sternum width/length: 0.95/ 0.60. Leg 1: 49.4 (11.9 + 0.5 + 11.7 + 22.5 + 2.8), tibia 2: 7.7, tibia 3: 5.6, tibia 4: 7.6; tibia 1 L/d: 98. Femora 1–4 width (at half length): 0.18, 0.19, 0.20, 0.18.   FIGURES1 15–121.  Mesabolivar tabatinga  sp. n.(ZFMK Ar 18991–92). 115–116. Left male palp, prolateral and retrolateral views. 117–118. Male chelicerae, lateral and frontal views. 119–120. Epigynum, ventral and lateral views. 121. Cleared female genitalia, dorsal view. Scale lines: 0.5. COLOR (in ethanol). Prosoma and legs ochre-orange, carapace with black median line, light brown mark behind ocular area and slightly darker lateral margins; legs with darker rings subdistally on femora and tibiae, more distinct rings proximally on tibiae, tips of femora and tibiae light; abdomen ochre-gray, with some dark internal marks dorsally on posterior half. BODY. Habitus as in Fig. 82; ocular area raised; carapace with distinct median furrow; clypeus and sternum unmodified. CHELICERAE. With pair of strongly protruding, S-shaped (in lateral view) frontal apophyses (Figs 117–118). PALPS. As in Figs 115–116; coxa with conical retrolateral apophysis; trochanter with finger-shaped retrolateral apophysis; femur with retrolateral process proximally and rounded prolateral protrusion set with short hairs, ventro-distally with large rounded protrusion; tarsus with three dorsal processes; procursus straight, with spine-like terminal process slightly bent; genital bulb process distally divided into dorsal semitransparent flap and ventral partly sclerotized element. LEGS. Densely covered with very short hairs (only metatarsi dorsally with hairs of usual length); without spines and 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 inseven other males from typelocality: 9.2–11.7 (mean 10.5). Abdomen color ranges from greenish-gray (with dorsal marks) to orange (without dorsal marks). The two males from Ecuadordiffer slightly in the shape of the cheliceral apophyses (not bent upwards basally) and in the distal spine-like process of the procursus (slightly longer and straight). They are therefore assigned tentatively.  Female.Unusually different from male in coloration and leg length: never orange, carapace ochre-yellow, dark mark behind ocular area and dark rings on legs more distinct than in males, abdomen always greenish-gray with dorsal (and sometimes also lateral) marks ( Fig. 83). Tibia 1 in 30 females: 4.9–6.3 (mean 5.6). Pedipalp tibiae slightly widened. Epigynum as in Figs 119–120, 133; anterior plate with pair of low processes and deep anterior pocket (continues into heavily sclerotized tube), with dark median furrow between pocket and posterior margin; posterior plate large, medially anteriorly excavated. Internal genitalia as in Figs 121, 134, with distinctively shaped pore-plates.  Natural history.The spiders were found from ground level up to 1 mabove the ground (rarely even higher). On the ground, the webs were mostly hidden under large leaves or in empty nuts where the spiders were resting; higher up in the vegetation or on trees, the webs led into dead curled leaves. When disturbed, the spiders vibrated rapidly and eventually ran away.   Distribution.Known from typelocality in Amazonasstate ( Brazil) and from specimens assigned tentatively from Ecuador( Fig. 725). 1835975906 ZFMK Brazil Other 31 32 3 2 1 Amazonas 1835975887 2009-12-04 ZFMK P. Michalik Ecuador Assigned -0.674 Yasuni Station 78 -76.398 Ar 31 32 2 2 Orellana