Ibotyporanga atikum 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 : 128-131

Ibotyporanga atikum Huber sp. nov.

urn:lsid:zoobank.org:act:B16F11B4-492F-4487-A28D-20E8AF0A8BAA

Figs 23C , 96 , 109–112

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; and sclerite in female internal genitalia) by combination of: procursus main branch and dorsal branch proximally overlapping, i.e., without space between them in lateral view ( Fig. 110C ); male palpal tarsus with very low dorsal hump (arrow in Fig. 110C ); embolus with distinctive dorsal apophysis (arrow in Fig. 110E ); and median sclerite in female internal genitalia very simple, almost rectangular ( Fig. 112C–D ). Distinguished from the very similar I. payaya sp. nov. also by main procursus branch in dorsal view narrower (compare Figs 102B and 110B ), shorter cheliceral apophysis (compare Figs 103B and 111B ), and epigynal pocket more curved and distinct (compare Figs 103C and 111C ).

Etymology

The species name honors the Atikum, an indigenous people of Brazil that lives in Bahia and Pernambuco; noun in apposition.

Type material

Holotype

BRAZIL – Bahia • ♂; SE of Bom Jesus da Lapa, ‘site 2’; 13.4383° S, 43.1645° W; 480 m a.s.l.; 18 Nov. 2022; B.A. Huber and L.S. Carvalho leg.; CHNUFPI 5960 .

Paratypes

BRAZIL – Bahia • 1 ♀; same collection data as for holotype; CHNUFPI 5961 • 1 ♂, 1 ♀; same collection data as for holotype; CHNUFPI 9048 [deposited in ZFMK Ar 24379] • 1 ♀; same collection data as for holotype; CHNUFPI 5962 .

Description

Male (holotype)

MEASUREMENTS. Total body length 1.7, carapace width 0.73. Distance PME–PME 45 µm; diameter PME 70 µm; distance PME–ALE 25 µm; distance AME–AME 20 µm; diameter AME 35 µm. Leg 1: 4.03 (1.07+0.27 +1.03 +1.23 + 0.43), tibia 2: 0.83, tibia 3: 0.77, tibia 4: 1.20; tibia 1 L/d: 11; diameters of leg femora 0.17; of leg tibiae 0.09–0.10.

COLOUR (in ethanol). Prosoma and legs ochre-yellow, carapace medially with darker Y-mark and posterior narrow band, leg femora and tibiae subdistally slightly darkened; abdomen gray with many darker internal marks; ventrally with light ochre plates in front of gonopore and in front of spinnerets.

BODY. Habitus as in I. ouro sp. nov. (cf. Fig. 73G ). Ocular area slightly raised. Carapace with distinct but shallow thoracic groove. Clypeus with sclerotized rim with median notch. Sternum wider than long (0.52/0.42), with very low and indistinct anterior processes near coxae 1 not different from those in female. Abdomen globular.

CHELICERAE. As in Fig. 111A–B ; width 0.29; with relatively short median frontal apophysis; stridulatory files very fine and poorly visible in dissecting microscope.

PALPS. As in Fig. 109 ; coxa unmodified; trochanter with short ventral process; femur proximally with distinct retrolateral process directed toward distal, with prolateral stridulatory pick, distally widened but unmodified; femur-patella joints not shifted toward one side; patella dorsally ~2.0 × as long as medially wide; tibia with two trichobothria in relatively proximal position; tibia-tarsus joints barely shifted toward retrolateral side; tarsus with very low dorsal hump (arrow in Fig. 110C ); procursus ( Fig. 110A–C ) with long dorsal branch distally curved towards prolateral, main branch with light prolateral band, subdistal short side-branch, distally slender and transparent; genital bulb ( Fig. 110D–F ) with narrow prolateral sclerite on bulbous part, embolus with distinctive dorsal sclerite.

LEGS. Without spines but with longer hairs ventrally on femora; without curved hairs; with short vertical hairs on tibia 1; retrolateral trichobothrium of tibia 1 at 60%; prolateral trichobothrium absent on tibia 1; tarsus 1 with ~3–4 pseudosegments, only distally distinct.

Variation (male)

Tibia 1 in second male: 1.18; dark rings on legs slightly more distinct in second male.

Female

In general, similar to male but clypeus unmodified, tibia 1 with few vertical hairs. Tibia 1 in three females: 1.07, 1.17, 1.23. Epigynum ( Fig. 112A ) anterior plate roughly semi-circular, posterior margin weakly indented, with distinct and strongly curved anterior pocket; posterior plate large but simple. Internal genitalia ( Figs 111C , 112B–D ) with pair of oval pore plates posteriorly, strongly sclerotized median structure, and very thin-walled large anterior expandable membranous sac.

Distribution

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

Natural history

The spiders were collected in the leaf litter of degraded roadside vegetation, among low shrubs and grasses. On the neighboring granite outcrop, we found a different species of Ibotyporanga , I. payaya sp. nov.

Figures

Fig. 23. Ibotyporanga spp., typical habitats, part two (cf. Fig. 22); all localities except for A are in Brazil. A. Colombia, Santa Marta (type locality of I. ziruma Huber sp. nov.). B. Bahia, E of São Félix do Coribe (type locality of I. imale Huber sp. nov.). C. Bahia, SE of Bom Jesus da Lapa (type locality of I. atikum Huber sp. nov.). D. Bahia, W of Bom Jesus da Lapa (I. emekori Huber & Brescovit, 2003). E. Bahia, Paramirim (type locality ofI. kiriri Huber sp. nov.). F. Pernambuco, NE of Lagoa Grande (type locality of I. sertao Huber sp. nov.). G. Bahia, near Toca do Índio (I. emekori Huber & Brescovit, 2003 and I. diroa Huber & Brescovit, 2003). H. Bahia, SW of Morro do Chapéu (I. canudos Huber sp. nov.). Photos BAH.

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. 109. Ibotyporanga atikum Huber sp. nov., male from Brazil, Bahia, SE of Bom Jesus da Lapa, ‘site 2’, ZFMK Ar 24379. Left palp, prolateral, dorsal, and retrolateral views. Scale line: 0.3 mm.

Fig. 110. Ibotyporanga atikum Huber sp. nov., male from Brazil, Bahia, SE of Bom Jesus da Lapa, ‘site 2’, ZFMK Ar 24379. A–C. Left tarsus and procursus, prolateral, dorsal, and retrolateral views (arrow: indistinct dorsal hump on tarsus). D–F. Left genital bulb, prolateral, dorsal, and retrolateral views (arrow: distinctive apophysis on embolus). Scale lines: 0.3 mm.

Fig. 111. Ibotyporanga atikum Huber sp. nov., male and female from Brazil, Bahia, SE of Bom Jesus da Lapa, ‘site 2’, ZFMK Ar 24379. A–B. Male chelicerae, frontal and lateral views. C. Cleared female genitalia, dorsal view (asterisk: expandable membranous sac not drawn, cf. Fig. 112C). Scale lines: 0.2 mm.

Fig. 112. Ibotyporanga atikum Huber sp. nov., female from Brazil, Bahia, SE of Bom Jesus da Lapa, ‘site 2’, ZFMK Ar 24379. A. Abdomen, ventral view. B–C. Cleared female genitalia, ventral and dorsal views. D. Detail of cleared female genitalia, dorsal view. Abbreviations: es = expandable membranous sac; pp =pore plate. Scale lines: A–C= 0.3 mm; D =0.1 mm.

Fig. 102. Ibotyporanga payaya Huber sp. nov., male from Brazil, Bahia, SE of Bom Jesus da Lapa, ‘site 1’, ZFMK Ar 24377. A–C. Left tarsus and procursus, prolateral, dorsal, and retrolateral views. D–F. Left genital bulb, prolateral, dorsal, and retrolateral views. Abbreviation: ps =prolateral sclerite. Scale lines: 0.2 mm.

Fig. 103. Ibotyporanga payaya Huber sp. nov., male and female from Brazil, Bahia, SE of Bom Jesus da Lapa, ‘site 1’, ZFMK Ar 24377. A–B. Male chelicerae, frontal and lateral views. C. Cleared female genitalia, dorsal view (asterisk: expandable membranous sac not drawn, cf. Fig. 104C). Scale lines: 0.2 mm.

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.