Pilbaraphanus bilybarianus, Giachino & Eberhard & Perina, 2021

Giachino, Pier Mauro, Eberhard, Stefan & Perina, Giulia, 2021, A rich fauna of subterranean short-range endemic Anillini (Coleoptera, Carabidae, Trechinae) from semi-arid regions of Western Australia, ZooKeys 1044, pp. 269-337 : 269

Pilbaraphanus bilybarianus sp. nov. Figs 13-14

Type locality.

WA, Pilbara, 60 km N of Tom Price, Solomon Mining Area, Kings deposit, 22°09'31.44"S, 117°51'50.9E.

Type series.

HT ♀, WA, Pilbara, 60 km N of Tom Price, Solomon Mining Area, Kings deposit, 22°09'31.44"S, 117°51'50.9E (WGS84), P. Bell, E.S. Volschenk, 24.Jan. 2010; Trog. net scrape (FMG005_SM0347_10:7877 Western Australian Museum Entomology Reg. no. 82607 (WAM).

Differential diagnosis.

Pilbaraphanus bilybarianus sp. nov. and P. chichesterianus sp. nov. are closely related and share the characters described in the genus diagnosis. P. bilybarianus sp. nov. differs from P. chichesterianus sp. nov. by its smaller body size, longer metatrochanters, and less transverse pronotum.

Description of the HT ♀.

TL mm 1.37. Body elongated and depigmented, yellow; integument shiny, with evident microsculpture and short pubescence.

Head robust, hypertrophic, narrower than pronotum; excess setae absent. Labium with smooth tooth, mentum articulated. Antennae robust, moniliform, short, reaching the base of the pronotum when stretched backwards. Fronto-clypeal furrow indistinct; anterior margin of the epistome subrectilinear.

Pronotum subsquare (max. width / max. length ratio = 1.03), with the maximum width at the base of the anterior fourth, and with basal border remarkably wider than anterior border; sides poorly and not regularly arcuate in the anterior part, gently sinuate in the basal half and slightly dentate before basal angles. Anterior angles obtuse, prominent; posterior angles squared, gently rounded. Disc convex, with very sparse pubescence of medium length; median groove very shallow, hardly evident. Marginal groove wide and flat, enlarged near the base; anterior marginal setae placed inside the marginal groove, almost on the anterior fourth; basal setae not placed inside on the disk, but before the posterior angles.

Legs long and slender, with metatrochanters long and acuminate, gently curved and metafemora dentate; metatrochanters (Fig. 14 ) as long as femoral tooth. All left legs missing in the HT ♀.

Elytra perfectly subrectangular (max. length / max. width ratio = 1.91), not truncated, only slightly emarginated before the apex. Disc convex, longitudinal grooves absent; integument shiny with evident microsculpture, and very short, sparse, upright pubescence not longitudinally aligned. Humeri well marked, gently rounded; post-humeral margin denticulate, with distinct crenulation up to the apical third; elytral apices separately rounded. Marginal groove wide and evident almost up to the 9th pore of the umbilicate series.

Chaetotaxy: scutellar pore large and foveate. Umbilicate series with the first three pores of the humeral group very closed to each other and equidistant; 4th pore farther and placed at the end of the basal third of the elytron; 5th pore placed before the base of the apical third of the elytron; 5th and 6th ones spaced from each other as half distance from 6th and 7th; 7th and 8th displaced onto the disc; 7th and 8th spaced from each other as the 8th and 9th. Three discal setae, the first placed before the 4th pore of the umbilicate series, the second one placed just before the 5th, and the third one placed at the level of the 7th pore of the umbilicate series.

Male. Unknown.

Etymology.

The species name derives from Bilybara , aboriginal name that refers to the Pilbara region.

Distribution.

Pilbaraphanus bilybarianus sp. nov. is known only from the type locality (Kings deposit, which is part of the Solomon Mining Area), 60 km N of Tom Price, Pilbara, WA.

Figures

Figures 10 - 14. Pilbaraphanus gen. et spp. nov., habitus (10, 13) right metafemur and metatrochanter in ventral view (11, 14) aedeagus in lateral view (12) 10 - 12 P. chichesterianus sp. nov., HT ♂ 13, 14 P. bilybarianus sp. nov. HT ♀. Scale bars: 0.1 mm.