Mesabolivar guaycolec,

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: 86-90

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Mesabolivar guaycolec

sp. n.

Mesabolivar guaycolec  sp. n.

Figs 323–324View FIGURES 315–326, 359–364View FIGURES359–364, 372–373View FIGURES 369–377

Mesabolivar  “ CAS 344”: Huber 2014: 139.

Diagnosis. Easily distinguished from most known congeners (except M. xingu  , M. amanaye  ) by series of parallel ridges ventrally on procursus ( Fig. 360View FIGURES359–364). From M. xingu  and M. amanaye  by armature of male chelicerae ( Figs 361–362View FIGURES359–364; three pairs of frontal processes of distinctive shape and in distinctive pattern), and by shape of epigynum (square-shaped, with sclerotized round internal pouch visible through cuticle; Figs 363View FIGURES359–364, 372View FIGURES 369–377) (female of M. xingu  unknown).

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

Type material. ARGENTINA: Formosa: ♂ holotype, CAS (9058810), 5♂ 4♀ paratypes, CAS (9027305), 25 km N Formosa, Estancia Guaycolec [25.985°S, 58.16°W, 185 m a.s.l.], 26.ii.–10.iii. 1999 (S.L. Heydon, J.M. Ledford).

Other material. None

Description. Male (holotype)

MEASUREMENTS. Total body length 3.4, carapace width 1.4. 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: 45.6 (11.7 + 0.5 + 11.5 + 19.9 + 2.0), tibia 2: 7.2, tibia 3: 5.2, tibia 4: 6.9; tibia 1 L/d: 88. Femora 1–4 width (at half length): 0.20, 0.20, 0.18, 0.18.

COLOR (in ethanol). Carapace ochre-yellow, with brown median mark including ocular area; clypeus not darkened; legs light brown, tips of femora and tibiae whitish, slightly darker rings on femora (subdistally) and tibiae (proximally and subdistally); abdomen pale gray, with darker internal marks dorsally and laterally, light brown mark in front of gonopore.

BODY. Habitus as in Figs 323–324View FIGURES 315–326; ocular area raised; carapace with distinct median furrow; clypeus and sternum unmodified.

CHELICERAE. With three pairs of frontal apophyses; only most proximal pair visible in lateral view ( Figs 361– 362View FIGURES359–364).

PALPS. As in Figs 359–360View FIGURES359–364; coxa with retrolateral apophysis; trochanter barely modified; femur with retrolateral process proximally, widened distally; procursus with ~7 ventral parallel ridges, proximal ridges indistinct, procursus tip distinctive; genital bulb process mostly unsclerotized, with fine sclerotized tip.

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 ~30 pseudosegments, indistinct.

Male (variation). Tibia 1 in three other males: 9.7, 11.5, 16.9.

Female. In general similar to male. Tibia 1 in three females: 7.3, 8.2, 8.2. Epigynum as in Figs 363View FIGURES359–364, 372View FIGURES 369–377; anterior plate square-shaped, with medially slightly protruding posterior margin and sclerotized round internal pouch visible through cuticle, without external pocket; posterior plate large but weakly sclerotized and barely visible. Internal genitalia as in Figs 364View FIGURES359–364, 373View FIGURES 369–377, with large pore-plates, distinctive posterior folds, and internal pouch originating from uterus externus and directed towards ventral cuticle.

Distribution. Known from type locality in Formosa Province ( Argentina) only ( Fig. 735View FIGURE 735).


California Academy of Sciences