Ibotyporanga atikum Huber & Meng & Král & Ávila Herrera & Carvalho 2024, sp. nov.
Creators: name: Huber, Bernhard A.
name: Meng, Guanliang
name: Král, Jiří
name: Ávila Herrera, Ivalú M.
name: Carvalho, Leonardo S.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Pholcidae
Ibotyporanga
Ibotyporanga atikum

description: 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.
description: Published as part of 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, pp. 1-169 in European Journal of Taxonomy 963 on pages 128-131, DOI: 10.5852/ejt.2024.963.2687, http://zenodo.org/record/13963130