Ibotyporanga ouro Huber, 2024

Huber, Bernhard A., Meng, Guanliang, Král, Jiří, Ávila Herrera, Ivalú M. & Carvalho, Leonardo S., 2024, Diamonds in the rough: Ibotyporanga (Araneae, Pholcidae) spiders in semi-arid Neotropical environments, European Journal of Taxonomy 963, pp. 1-169 : 137-140

Ibotyporanga ouro Huber sp. nov.

urn:lsid:zoobank.org:act:F163AD8E-9921-4EC6-9032-E1F39ED7F1F5

Figs 73G , 96 , 117–120

Diagnosis

Distinguished from similar congeners (with split procursus with long dorsal branch; long male palpal patella, i.e., dorsally>1.8×as long as medially wide; wide epigynum, i.e.,>1.9 ×as wide as long; distinct epigynal pocket, i.e., narrow and relatively deep; and sclerite in female internal genitalia) by combination of: procursus main and dorsal branches proximally with relatively wide space between them in lateral view ( Fig. 118C ); male palpal tarsus with large dorsal hump (arrow in Fig. 118C ); and median sclerite in female internal genitalia without posterior constriction ( Figs 119C , 120B–C ); from I. itajubaquara sp. nov. and I. kiriri sp. nov. also by tip of dorsal branch of procursus with distinct ‘buckle’, i.e., not evenly curved ( Fig. 118C ). Females of I. ouro sp. nov. may be indistinguishable morphologically from females of I. itajubaquara , I. kiriri , and I. canudos sp. nov.

Etymology

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

Type material

Holotype

BRAZIL – Bahia • ♂; E of Gentio do Ouro; 11.4242° S, 42.3394° W; 550 m a.s.l.; 22 Nov. 2022; B.A. Huber and A.S. Michelotto leg.; CHNUFPI 5969 .

Paratypes

BRAZIL – Bahia • 1 ♂, 5 ♀♀; same collection data as for holotype; CHNUFPI 5970 • 1 ♀; same collection data as for holotype; UFMG 31661 • 1 ♂, 1 ♀; same collection data as for holotype; CHNUFPI 9051 [deposited in ZFMK Ar 24382] .

Other material examined

BRAZIL – Bahia • 1 ♂, 7 ♀♀, in pure ethanol; same collection data as for holotype; CHNUFPI 5971 [deposited in ZFMK Br22-209] .

Description

Male (holotype)

MEASUREMENTS. Total body length 1.9, carapace width 0.78. Distance PME–PME 60 µm; diameter PME 70 µm; distance PME–ALE 25 µm; distance AME–AME 15 µm; diameter AME 45 µm. Leg 1: 4.40 (1.17+0.27 +1.12 +1.37 + 0.47), tibia 2: 0.93, tibia 3: 0.87, tibia 4: 1.30; tibia 1 L/d: 11; diameters of leg femora 0.18–0.19; of leg tibiae 0.10.

COLOUR (in ethanol). Prosoma ochre-yellow, carapace medially with narrow darker Y-mark, ocular area and clypeus not darkened; legs ochre, with indistinct darker rings subdistally on femora and tibiae; abdomen gray with indistinct darker internal marks; ventrally with barely visible light ochre plates in front of gonopore and in front of spinnerets.

BODY. Habitus as in Fig. 73G . Ocular area slightly raised. Carapace with distinct but shallow thoracic groove. Clypeus with sclerotized rim with median notch. Sternum wider than long (0.56/0.46), with very low and indistinct anterior processes near coxae 1 only slightly higher than in female. Abdomen globular.

CHELICERAE. As in Fig. 119A–B ; width 0.305; with short median frontal apophysis; stridulatory files very fine and poorly visible in dissecting microscope.

PALPS. As in Fig. 117 ; coxa unmodified; trochanter with short ventral process; femur proximally with distinct retrolateral process slightly directed toward distal, with prolateral stridulatory pick, distally widened but unmodified; femur-patella joints not shifted toward one side; patella dorsally ~1.9 × as long as medially wide; tibia with two trichobothria in relatively proximal position; tibia-tarsus joints slightly shifted toward retrolateral side; tarsus with strong dorsal hump (arrow in Fig. 118C ); procursus ( Fig. 118A–C ) split into long dorsal and main (ventral) branches; dorsal branch narrow in lateral view, slightly wider in dorsal view, distally with distinctive ‘buckle’ and slightly curved towards prolateral; main branch with light prolateral band, wider in lateral view than in dorsal view, with tiny subdistal side-branch, distally transparent and curved backwards; genital bulb ( Fig. 118D–F ) with prolateral sclerite on bulbous part, embolus tip simple, without distinctive sclerotized elements.

LEGS. Without spines but with longer hairs ventrally on femora; without curved hairs; with short vertical hairs on tibiae 1 and 2; retrolateral trichobothrium of left tibia 1 at 63%, of right tibia 1 at 59%; prolateral trichobothrium absent on tibia 1; tarsus 1 with ~3–4 pseudosegments, only distally distinct.

Variation (male)

Tibia 1 in three other males: 1.07, 1.10, 1.20. Dark rings on legs variably distinct.

Female

In general, similar to male but clypeus unmodified, leg tibiae with few vertical hairs. Tibia 1 in 13 females: 1.03–1.35 (mean 1.20). Epigynum ( Fig. 120A ) anterior plate wide and short, posterior margin barely indented, with distinct anterior pocket; posterior plate large but simple. Internal genitalia ( Figs 119C , 120B–C ) with strongly sclerotized median structure and very thin-walled large anterior membranous expandable sac; pore plates narrow, at posterior margin of internal arc.

Distribution

Known from the type locality only, in Bahia, Brazil ( Fig. 96B ).

Natural history

The type locality is a hill at the roadside with thorny shrubs, with the soil covered by a thin layer of small stones. The spiders were found under these stones. Two egg sacs had diameters of 1.7 and 2.0 and contained ~20 and 30 eggs each, with egg diameters of 0.54–0.56.

Figures

Fig. 73. Ibotyporanga spp., live specimens, part three (cf. Figs 25, 55), all from Brazil. A. I. sertao Huber sp. nov., male from Pernambuco, W of Orocó. B–C. I. guanambi Huber sp. nov., male and female with egg sac from Bahia, N of Guanambi. D. I. emekori Huber & Brescovit, 2003, male from Bahia, near Toca do Índio.E. I. tuxa Huber sp. nov., male from Bahia, W of Barra do Mendes. F. I. kiriri Huber sp. nov., male from Bahia, SE of Paramirim. G. I. ouro Huber sp. nov., male from Bahia, E of Gentio do Ouro. H. I. canudos Huber sp. nov., male from Bahia, SW of Morro do Chapéu.

Fig. 96. Known geographic distribution of Brazilian species with long procursus, with dorsal branch on procursus, and with median sclerite in female internal genitalia. The figure is split in order to avoid too much overlap. The question mark denotes a possibly mislabeled female specimen of I. tuxa sp. nov.

Fig. 117. Ibotyporanga ouro Huber sp. nov., male from Brazil, Bahia, E of Gentio do Ouro, ZFMK Ar 24382. Left palp, prolateral, dorsal, and retrolateral views. Scale line: 0.3 mm.

Fig. 118. Ibotyporanga ouro Huber sp. nov., male from Brazil, Bahia, E of Gentio do Ouro, ZFMK Ar 24382. A–C. Left tarsus and procursus, prolateral, dorsal, and retrolateral views (bold arrow: dorsal hump on tarsus). D–F. Left genital bulb, prolateral, dorsal, and retrolateral views. Abbreviation: db =dorsal branch of procursus. Scale lines: 0.2 mm.

Fig. 119. Ibotyporanga ouro Huber sp. nov., male and female from Brazil, Bahia, E of Gentio do Ouro, ZFMK Ar 24382. A–B. Male chelicerae, frontal and lateral views. C. Cleared female genitalia, dorsal view (asterisk: expandable membranous sac not drawn, cf. Fig. 120C). Scale lines: 0.2 mm.

Fig. 120. Ibotyporanga ouro Huber sp. nov., female from Brazil, Bahia, E of Gentio do Ouro, ZFMK Ar 24382. A. Abdomen, ventral view.B–C. Cleared female genitalia, ventral and dorsal views.Abbreviation: es =expandable membranous sac. Scale lines: 0.3 mm.