Ibotyporanga ziruma Huber sp. nov.

urn:lsid:zoobank.org:act: 6383A80B-49A0-4922-BB37-305706C33EE5

Figs 23A, 25A, 26–30; SEM Figs 2A–B, 3G, 4A, 5C, 6A, 7C–D, 9A–B, 10A, 11A, 13A, 14A, 15A, C, 16A, 17A–B, 18A, 19C, 20D

Diagnosis

Easily distinguished from all known congeners by male cheliceral armature (Fig. 29A–B; pointed median apophysis in distal position; proximal rounded process) and by posterior position of female epigynal pocket (Fig. 30). Also, by shape of procursus (Fig. 28A–C; very simple, wide in lateral view, distally narrower) and by slender apophysis dorsally on genital bulb (arrow in Fig. 28E).

Etymology

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

Type material

Holotype

COLOMBIA – Magdalena • ♂; Santa Marta, at Cerro Ziruma; 11.2126° N, 74.2307° W; 110 m a.s.l.; 16 Sep. 2022; B.A. Huber leg.; MUSENUV-Ar 2734.

Paratypes

COLOMBIA – Magdalena • 2 ♂♂; same collection data as for holotype; MUSENUV-Ar 2735 • 1 ♂, 1 ♀; same collection data as for holotype; ZFMK Ar 24349 .

Other material examined

COLOMBIA – Magdalena • 2 ♂♂, 5 ♀♀, in pure ethanol; same collection data as for holotype; ZFMK Col273 [1 ♂, 1 ♀ used for SEM] .

Description

Male (holotype)

MEASUREMENTS. Total body length 1.5, carapace width 0.66. Distance PME–PME 55 µm; diameter PME 55 µm; distance PME–ALE 20 µm; distance AME–AME 15 µm; diameter AME 40 µm. Leg 1: 3.42 (0.98+0.22 +0.86 +1.00 + 0.36), tibia 2: 0.74, tibia 3: 0.69, tibia 4: 1.02; tibia 1 L/d: 10; diameters of leg femora 0.16, of leg tibiae 0.09.

COLOUR (in ethanol). Prosoma and legs mostly light ochre-orange, carapace medially and ocular area posteriorly with distinct darker mark; legs without darker rings; abdomen pale ochre-gray with darker internal marks dorsally and laterally; ventrally with light ochre plates in front of gonopore and in front of spinnerets.

BODY. Habitus as in female (cf. Fig. 25A). Ocular area slightly raised. Carapace with distinct but shallow thoracic groove (Fig. 2A). Clypeus with sclerotized rim with median notch. Sternum slightly wider than long (0.46/0.40), with small but distinct anterior processes near coxae 1 (Fig. 3G; ~30 µm high, 30 µm diameter at basis). Abdomen globular; gonopore with four epiandrous spigots in two groups (Fig. 4A); spinnerets as usual for genus (Fig. 7C).

CHELICERAE. As in Fig. 29A–B; with strong median frontal apophysis pointing towards distal and light proximal process directed towards frontal (see also Fig. 9A); stridulatory files (Fig. 10A) very fine and poorly visible in dissecting microscope.

PALPS. As in Fig. 27; coxa unmodified; trochanter ventrally slightly protruding; femur proximally with retrolateral process not directed toward distal, with prolateral stridulatory pick, distally widened but unmodified; femur-patella joints not shifted toward one side; patella dorsally as long as medially wide; tibia-tarsus joints slightly shifted toward retrolateral side; tarsus without dorsal process, with small capsulate tarsal organ (Fig. 13A); procursus (Fig. 28A–C) wide in lateral view, distally slightly curved towards dorsal and retrolateral, with light prolateral band (also visible in retrolateral view) and fringed membranous tip (Fig. 11A); genital bulb (Fig. 28D–F) with distinct prolateral sclerite on bulbous part, with slender dorsal prolateral sclerite parallel to embolus.

LEGS. Without spines but with longer and slightly stronger hairs ventrally on femora (Fig. 15A); without curved hairs; with many short vertical hairs on tibia 1 (Fig. 16A) and (fewer) on tibia 2; retrolateral trichobothrium of tibia 1 at 59%; prolateral trichobothrium absent on tibia 1; tarsus 1 with ~3–4 pseudosegments, distally fairly distinct.

Variation (male)

Tibia 1 in six males (incl. holotype): 0.86–0.95 (mean 0.90).

Female

In general, similar to male but slightly darker, carapace also laterally with light brown bands, legs light brown; clypeus and sternum unmodified, chelicerae without stridulatory files (Fig. 9B); tibiae with few short vertical hairs. Tibia 1 in five females: 0.83–0.91 (mean 0.87). Epigynum (Fig. 30A) anterior plate oval, slightly wider than long, posterior margin evenly curved, with wide and shallow pocket in posterior position (Fig. 5C); posterior plate wide and short. Internal genitalia (Fig. 30B–D) with pair of elongate pore plates, membranous posterior folds and transversal anterior structure (asterisk in Fig. 30C).

Distribution

Known from type locality only, in Colombia, Magdalena (Fig. 26).

Natural history

The spiders were found on an arid hill near the sea where they were beaten out of dead and dried columnar cacti lying on the ground (Fig. 23A). They shared this microhabitat with another species of Ninetinae, Galapa gabito Huber, 2024 .