Ibotyporanga capivara Huber sp. nov.

urn:lsid:zoobank.org:act: 49D88912-D718-470E-A220-41291C2C50FF

Figs 74, 92–95

Diagnosis

Males are easily distinguished from known congeners by very distal origin of dorsal branch of procursus (arrow in Fig. 93C). Females are externally possibly indistinguishable from putatively close relatives (species with split procursus but without median sclerite in female internal genitalia: I. imale sp. nov., I. ramosae, I. guanambi sp. nov., I. sertao sp. nov.); I. ramosae and I. imale seem to have shorter legs (tibia 1 <1.4); I. sertao is distinguished by internal genitalia with distinct pair of convoluted tubes and by absence of large median expandable sac. Distinguished from I. ramosae, I. imale, and I. guanambi by larger pore plates not clearly integrated in internal genital arc (Figs 94C, 95D).

Etymology

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

Type material

Holotype

BRAZIL – Piauí • ♂; Coronel José Dias, Parque Nacional da Serra da Capivara, near Toca de Cima dos Pilões; 8.8635° S, 42.5571° W; 415 m a.s.l.; 15 Jul. 2023; L.S. Carvalho and E.G. Noetzold leg.; CHNUFPI 5021.

Paratypes

BRAZIL – Piauí • 1 ♀; together with holotype; CHNUFPI 5021 • 1 ♀; same collection data as for holotype; CHNUFPI 5011 .

Other material examined

BRAZIL – Piauí • 1 ♀, 1 juv.; Coronel José Dias, Parque Nacional da Serra da Capivara, Trilha Interpretativa Hombu, mountain top; 8.8494° S, 42.5661° W; 550 m a.s.l.; 15 Jul. 2023; L.S. Carvalho and E.G. Noetzold leg.; CHNUFPI 5023 .

Description

Male (holotype)

MEASUREMENTS. Total body length 2.7, carapace width 0.95. Distance PME–PME 80 µm; diameter PME 100 µm; distance PME–ALE 30 µm; distance AME–AME 20 µm; diameter AME 80 µm. Leg 1: 6.22 (1.67+0.37 +1.58 +2.03 + 0.57), tibia 2: 1.30, tibia 3: 1.17, tibia 4: 1.67; tibia 1 L/d: 13; diameters of leg femora 0.21–0.22, of leg tibiae 0.12.

COLOUR (in ethanol). Prosoma pale ochre-yellow, carapace medially and clypeus darker, ocular area with dark median band; legs ochre-yellow with darker rings on femora (subdistally) and tibiae (proximally and subdistally); abdomen gray, dorsally and laterally with many dark internal marks; ventrally with ochre-yellow plates in front of gonopore and in front of spinnerets.

BODY. Habitus as in I. sertao sp. nov. (cf. Fig. 73A). Ocular area slightly raised. Carapace with distinct but shallow thoracic groove. Clypeus with sclerotized rim with median notch. Sternum wider than long (0.64/0.54), with very low humps near coxae 1 not higher than in female. Abdomen globular.

CHELICERAE. As in Fig. 94A–B; with strong median frontal apophysis; stridulatory files large, ridges fine and poorly visible in dissecting microscope.

PALPS. As in Fig. 92; coxa unmodified; trochanter with short rounded ventral protrusion; femur proximally with distinct retrolateral process directed toward distal, with prolateral stridulatory pick, distally widened with low dorsal hump; femur-patella joints not shifted toward one side; patella dorsally ~1.6 ×as long as medially wide; tibia-tarsus joints slightly shifted toward retrolateral side; tarsus without dorsal process; procursus (Fig. 93A–C) long and widely curved, with light prolateral band, distally split; genital bulb (Fig. 93D–F) with distinct prolateral sclerite on bulbous part, embolus with slender prolateral ridge.

LEGS. Without spines but with longer and slightly stronger hairs ventrally on femora; without curved hairs; with several rows of short vertical hairs on tibia 1; retrolateral trichobothrium of tibia 1 at 57%; prolateral trichobothrium absent on tibia 1; tarsus 1 with 3–4 pseudosegments.

Female

In general, similar to male but clypeus unmodified; tibia 1 with few short vertical hairs. Tibia 1 length in three females: 1.43, 1.50, 1.50. Epigynum (Fig. 95A) anterior plate semi-circular, with indistinct and shallow anterior pocket, posterior margin indented; posterior plate large but simple. Internal genitalia (Figs 94C, 95B–D) with large membranous expandable sac, pair of large pore plates posteriorly, and apparently with pair of lateral membranous sacs or pouches (bold arrow in Fig. 95D).

Distribution

Known from two neighboring localities in the Serra da Capivara, southern Piauí, Brazil (Fig. 74).

Natural history

The spiders were found under arenite rocks in primary arboreal caatinga vegetation, within a national park.