Gracilanillus hirsutus, 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

Gracilanillus hirsutus sp. nov. Figs 4-5

Type locality.

WA, Pilbara, 44 km W of Pannawonica, Robe Valley, Mesa A Mine, 21°39'52"S, 115°53'48"E.

Type series.

HT ♀, WA, Pilbara, 44 km W of Pannawonica, Robe Valley, Mesa A Mine (bore MEARC4038), 21°39'52"S, 115°53'48"E (GPS), 10 June-3 Aug. 2006; litter trap L. Mould, M. Greenham; Western Australian Museum Entomology Reg. no. 64216 (WAM).

Differential diagnosis.

Gracilanillus hirsutus sp. nov. can be distinguished from G. pannawonicanus sp. nov. in the presence of long and sparse pubescence longitudinally aligned on the elytral disc, head with many excess setae, and for the standard position of the ninth pore of the umbilicate series.

Description of the HT ♀.

TL 1.39 mm. Body elongated, depigmented, yellow-testaceous; shiny integument with evident microsculpture and pubescence.

Head robust, hypertrophic, slightly narrower than pronotum; bearing a number of excess setae. Labium toothless, mentum articulate. Antennae robust, moniliform, and short, not exceeding the base of the pronotum when stretched backwards. Fronto-clypeal furrow indistinct; anterior margin of the epistome subrectilinear.

Pronotum subquadrate (max. width / max. length ratio = 1.05), with maximum width in the middle, and with basal border as wide as anterior border; sides slightly but regularly arcuate from anterior to posterior, not sinuate, but strictly emarginated before the basal angles. Anterior angles rounded, poorly prominent; posterior angles subsquare. Disc convex, with long and sparse pubescence; median groove very shallow, hardly evident. Marginal groove wide and flat, slightly enlarged near the base; anterior marginal setae placed inside marginal groove, almost on anterior fifth; basal setae almost before the posterior angles.

Legs short and stout, with metatrochanters short and stout and metafemora not dentate (Fig. 5 ).

Elytra subrectangular, elongated (max. length / max. width ratio = 1.84), with maximum width at the base of the posterior third, not emarginated before apex. Disc slightly convex, with evident longitudinal groove running more or less between the scutellar pore and the 9th pore of the umbilicate series; integument shiny with evident microsculpture and long, sparse, upright pubescence, longitudinally aligned. Humeri well marked; post-humeral margin denticulate, with distinct crenulations all the way 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, foveate. Umbilicate series with first three pores of humeral group equidistant; 4th pore farther and placed at the end of the basal fourth of elytron; 5th pore placed before the apical third of elytra; 5th and 6th ones spaced out ca. half distance of 6th and 7th; 8th slightly displaced on the disc; 7th and 8th closer to each other than 8th and 9th. Two discal setae, first placed before the 5th pore of the umbilicate series, second one placed just before 8th pore.

Male. Unknown.

Etymology.

The name comes from the Latin Gracilanillus hirsutus (= hairy, hirsute) to recognise the presence of many excess setae on the head.

Distribution.

Gracilanillus hirsutus sp. nov. occurs only at the type locality in Mesa A Mine, Robe River Valley, 44 km W of Pannawonica, Pilbara, WA.

Figures

Figures 4 - 7. Gracilanillus spp.: habitus HT ♀ (4, 6) left metafemur and metatrochanter in ventral view HT ♀ (5, 7) 4, 5 G. hirsutus sp. nov. 6, 7 G. pannawonicanus sp. nov. Scale bars: 0.1 mm.