Mesabolivar saci,

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: 112-115

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Mesabolivar saci

sp. n.

Mesabolivar saci  sp. n.

Figs 452–453View FIGURES 447–458, 489–497View FIGURES 489–493View FIGURES 494–497, 531View FIGURES 520–537

Diagnosis. Easily distinguished from most congeners by subdistal lateral constriction of male chelicerae ( Fig. 492View FIGURES 489–493); also by details of male palp (procursus S-shaped in dorsal view, Fig. 491View FIGURES 489–493; femur very large relative to tibia, Figs 489–490View FIGURES 489–493), and by shape of epigynum ( Figs 494–496View FIGURES 494–497; anterior plate with pair of large processes, median pocket, and small median anterior process); from the very similar M. constrictus  by tip of procursus in dorsal view (compare Figs 491View FIGURES 489–493, 499View FIGURES 498–505), by proximal anterior processes on male chelicerae (compare Figs 493View FIGURES 489–493, 500View FIGURES 498–505), and by pair of epigynal processes only weakly curved backwards (compare Figs 495View FIGURES 494–497, 504View FIGURES 498–505).

Etymology. The species is named for a character in Brazilian folklore (Saci) who grants wishes to anyone who manages to trap him (I did!); noun in apposition.

Type material. BRAZIL: Santa Catarina: ♂ holotype, 1♀ paratype, UFMG (21532–33), 1♂ 3♀ paratypes, ZFMK (Ar 19207), São Joaquim National Park (28.034°S, 49.611°W), fern forest along small stream, ~ 1100–1200 m a.s.l., 18.x.2014 (B.A. Huber, L.S. Carvalho).

Other material examined. BRAZIL: Santa Catarina: 2♀ 1 juv. in pure ethanol, ZFMK (Br14-160), same data as types. 

Description. Male (holotype)

MEASUREMENTS. Total body length 2.0, carapace width 1.0. Distance PME-PME 90 µm, diameter PME 80 µm, distance PME-ALE 70 µm, distance AME-AME 20 µm, diameter AME 30 µm. Sternum width/length (in other male; sternum in holotype damaged): 0.70/0.50. Leg 1: 8.5 (2.2 + 0.3 + 2.3 + 3.4 + 0.3; see variation below), tibia 2: 1.6, tibia 3: 1.3, tibia 4: 2.3; tibia 1 L/d: 26. Femora 1–4 width (at half length): 0.18, 0.20, 0.22, 0.17.

COLOR (in ethanol). Prosoma and legs ochre-yellow, legs without light or dark rings; abdomen dorsally and laterally densely covered with dark bluish marks, ventrally pale greenish gray with light brown marks in front of gonopore and in front of spinnerets.

BODY. Habitus as in Fig. 452View FIGURES 447–458; ocular area raised; carapace with shallow but distinct median furrow; clypeus unmodified; sternum unmodified.

CHELICERAE. With pair of large frontal apophyses and two pairs of smaller processes, one frontal, one lateral; with distinctive subdistal constriction ( Figs 492–493View FIGURES 489–493).

PALPS. As in Figs 489–490View FIGURES 489–493; coxa with large retrolateral apophysis; trochanter ventrally protruding; femur large, with retrolateral process proximally; tarsus with simple dorsal process; procursus S-shaped in dorsal view ( Fig. 491View FIGURES 489–493), with distinctive distal sclerotized and membranous elements; bulb with simple process distally divided in two parallel cylinders, one slightly sclerotized, the other transparent.

LEGS. Without spines and curved hairs, few vertical hairs; retrolateral trichobothrium on tibia 1 at 9%; prolateral trichobothrium present on tibia 1; tarsus 1 with only 5 pseudosegments (see variation below).

Male (variation). The distal segments of the only leg 1 of the holotype have unusual (probably teratological) lengths (metatarsus too long, tarsus too short); leg 1 in other male: 8.6 (2.2 + 0.3 + 2.3 + 3.1 + 0.7); tarsus 1 in this male with ~15 pseudosegments, distally fairly distinct.

Female. In general similar to male ( Fig. 453View FIGURES 447–458). Tibia 1 in four females: 1.8, 1.8, 1.9, 2.0. Epigynum as in Figs 494–496View FIGURES 494–497; complex anterior plate with small anterior median process, large median pocket, and pair of large processes weakly curved backwards; posterior plate anteriorly raised, with variably distinct median process at posterior margin. Internal genitalia as in Figs 497View FIGURES 494–497, 531View FIGURES 520–537, small relative to external genitalia, with pair of oval poreplates close together (pore-plates appear round in Fig. 497View FIGURES 494–497 because they are higher anteriorly than posteriorly). One female with whitish abdomen.

Natural history. This species was found among dense roots of ferns in the soil. One egg sac contained ~ 10 eggs.

Distribution. Known from type locality in Santa Catarina state ( Brazil) only ( Fig. 739View FIGURES 738–739).


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