Ibotyporanga bariro Huber, 2020

Huber, Bernhard A. & Villarreal, Osvaldo, 2020, On Venezuelan pholcid spiders (Araneae, Pholcidae), European Journal of Taxonomy 718, pp. 1-317 : 62-65

Ibotyporanga bariro Huber sp. nov.

urn:lsid:zoobank.org:act:24EB3E00-C450-496F-B069-582C29062C21

Figs 176–177 , 189–196 , 1031, 1040

Diagnosis

Easily distinguished from known congeners by shape of procursus ( Fig. 190 ; wide, weakly curved, without side branch, distally with transparent fringed membrane); female internal genitalia ( Fig. 193 ) without U-shaped median structure (in contrast to I. naideae Mello-Leit ṳo, 1944 and I. emekori Huber & Brescovit, 2003 ; females of I. diroa Huber & Brescovit, 2003 and I. ramosae Huber & Brescovit, 2003 are unknown).

Etymology

The species name refers to the type locality; noun in apposition.

Type material

VENEZUELA – Falcón • ♂ holotype, ZFMK (Ar 21862), SE Bariro (10.7304° N, 70.6957° W), 360 m a.s.l., on arid hill, 14 Feb. 2020 (B.A. Huber, O. Villarreal M., Q. Arias C.) .

Other material examined

VENEZUELA – Falcón • 1 ♂ (and two female abdomens transferred from ZFMK, Ven20-141), ZFMK (Ar 21863), and 6 ♀♀, 1 juv. in pure ethanol, ZFMK (Ven20-141), same collection data as for holotype .

Description

Male (holotype)

MEASUREMENTS. Total body length 1.7, carapace width 0.95. Distance PME–PME 50 µm; diameter PME 60 µm; distance PME–ALE 25 µm; distance AME–AME 15 µm; diameter AME 30 µm. Leg 1: 4.00 (1.10 +0.30 +1.00 +1.15 + 0.45), tibia 2: 0.90, tibia 3: 0.85, tibia 4: 1.20; tibia 1 L/d: 10.

COLOR (in ethanol). Prosoma and legs ochre-yellow, carapace with brown median band excluding ocular area; legs without dark rings; abdomen gray, with small dark marks dorsally.

BODY. Habitus as in Fig. 176 . Ocular area barely raised. Carapace with distinct thoracic groove. Clypeus barely modified (slightly more protruding than in female). Sternum wider than long (0.50/0.38), without anterior humps. Abdomen globular.

CHELICERAE. As in Figs 191–192 , with strong median apophysis and lateral stridulatory ridges.

PALPS. As in Figs 189–190 ; coxa unmodified; trochanter with rounded ventral projection; femur proximally slender, with retrolateral process and prolateral stridulatory pick (modified hair), distally widened; patella cylindrical; tibia enlarged; procursus very simple, wide, weakly curved, without side branch, distally with transparent fringed membrane; genital bulb large, with prolateral sclerotized band, simple embolar division ending in small sclerotized angular apophysis.

LEGS. Without spines and curved hairs; vertical hairs in high density prolatero-dorsally on tibiae 1–2; retrolateral trichobothrium of tibia 1 at 58%; prolateral trichobothrium absent on tibia 1; tarsus 1 with 6 pseudosegments.

Female

In general similar to male ( Fig. 177 ), clypeus slightly less protruding, with usual low density of vertical hairs on tibiae, dark median band on carapace sometimes including ocular area and clypeus, abdomen variably with or without dark marks. Tibia 1 in six females: 0.85–1.00 (mean 0.90). Epigynum ( Fig. 194 ) anterior plate trapezoidal, with anterior sclerotized rim; posterior plate short, simple. Internal genitalia ( Figs 193 , 195–196 ) small relative to epigynal plate, with pair of drop-shaped pore plates, without U-shaped median structure and without pair of lateral blind tubes.

Distribution

Known from type locality only, in Venezuela , Falcón (Fig. 1040).

Natural history

The species was collected on an arid hill dominated by small trees and cacti (Fig. 1031). Most specimens were collected from partly hollow rotten branches on the ground. When shaken out of their shelters, the spiders ran extremely rapidly over the ground. The species shared the locality with three other pholcid species, an unidentified Ninetinae (on the undersides of rocks), Modisimus culicinus (Simon, 1893) (under rocks) and Physocyclus globosus (Taczanowski, 1874) (among and under rocks).

Figures

Figs 172–177. Live specimens. 172–173. Chisosa caquetio Huber, 2019; male and female with egg sac from Falcón, Cueva del Guano. 174–175. Galapa spiniphila Huber sp. nov.; male and female with egg sac from Falcón, near Cueva del Guano. 176–177. Ibotyporanga bariro Huber sp. nov.; male and female from Falcón, SE Bariro.

Figs 189–193. Ibotyporanga bariro Huber sp. nov.; from Falcón, SE Bariro (type locality; ZFMK Ar 21862–63). 189–190. Left male pedipalp, prolateral and retrolateral views. 191–192. Male chelicerae, frontal and lateral views. 193. Cleared female genitalia, dorsal view. Scale lines: 0.2 mm.

Figs 194–199. Ibotyporanga Mello-Leitṳo, 1944; epigyna and cleared female genitalia (arrows: anterior rim/pocket, presumably for male cheliceral apophysis). 194–196. I. bariro Huber sp. nov.; from Falcón, SE Bariro (type locality; ZFMK Ar 21863), epigynum, ventral view, and cleared female genitalia, ventral and dorsal views. 197–199. Ibotyporanga sp. from Falcón, near Cueva del Guano (ZFMK Ar 21861), epigynum and cleared female genitalia, dorsal view.