Erwinanillus baehri, 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

Erwinanillus baehri sp. nov. Figs 1-3

Type locality.

WA, Southern Goldfields region, Forrestania, 80 km E of Hyden, Cosmic Boy Mine, 32°29'19"S, 119°40'49"E.

Type series.

HT ♂, WA, Southern Goldfields region, Forrestania, 80 km E of Hyden, Cosmic Boy Mine, 32°29'19"S, 119°40'49"E, 06 April 2009, Rockwater, bore WWMB4, hauling. Western Australian Museum Entomology Reg. no. 72025 (WAM). PTT: 1 ♀ (remains), WA, Southern Goldfields region, Forrestania, 80 km E of Hyden, Cosmic Boy Mine, 32°29'18.84"S, 119°40'48.69"E (WGS84), Rockwater, 6 April 2009, Stygo net haul. (RW-WWMB4-LN5105), Western Australian Museum Entomology Reg. no. 82637 (WAM); 1 spec. (remains), WA, Southern Goldfields region, Forrestania, 80 km E of Hyden, Cosmic Boy Mine, 32°29'18.84"S, 119°40'48.69"E (WGS84), Rockwater, 6 April 2009, Stygo net haul. (RW-WWMB4-LN5105), Western Australian Museum Entomology Reg. no. 82638 (CGi).

Diagnosis.

Small species, with longitudinal elytral grooves; male protarsi with two dilated tarsomeres and profemora unarmed; metafemora dentate and metatrochanters short and stout in male and female. Head characterised by temples with a series of excess long setae. One elytral discal seta present. Aedeagus with right paramere bearing two apical setae; left bearing only one seta.

Description.

TL 1.40-1.42 mm. Body elongated, depigmented, fulvo-testaceous with elytra and abdomen lighter, yellow-testaceous; integument shiny with evident microsculpture and spread pubescence.

Head robust, almost hypertrophic, slightly narrower than the pronotum. Labium toothless, mentum articulate. Antennae robust, moniliform, 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 the maximum width on the anterior fourth, narrowed at the base, with the sides poorly arcuate anteriorly, sinuate before the base. Anterior angles rounded, weakly prominent; posterior angles subsquare and acuminate at tips. Disc convex, with a 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 the marginal groove, almost on the anterior fifth; basal setae before the posterior angles.

Legs short and stout, two protarsomeres dilated and without adhesive phanerae in male. Metatrochanters short and stout, metafemora dentate (Fig. 2 ).

Elytra oval, slightly elongated (max. length / max. width ratio = 1.72), with maximum width in the middle, not emarginated before apex. Disc poorly convex, provided with an 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 short, dense, upright pubescence. Humeri poorly marked, rounded. Post-humeral margin denticulate, with a very thin but distinct crenulation to the apical third; elytral apices separately rounded. Marginal groove wide and evident almost to the 8th pore of the umbilicate series.

Chaetotaxy: scutellar pore large, foveate. Umbilicate series with the first three pores of the humeral group not equidistant, with 1st and 2nd closer together than 2nd and 3rd; 4th pore clearly farther and placed at the end of the basal third of the elytron; 5th pore placed before the apical third of the elytra; 5th and 6th ones spaced out ca. half distance between the 6th and 7th; 7th slightly and 8th nearly moved onto the disc; 7th and 8th slightly closer to each other than the 8th and 9th. One discal seta, placed before the 7th pore of the umbilicate series.

Aedeagus (Fig. 3 ) small, abruptly arcuate in the basal part; median lobe moderately elongated with ventral margin gently arcuate up to the acuminate apex, with apical blade very evident. Endophallus without an evident lamella copulatrix. Parameres stocky in the basal part and relatively poorly elongated, not reaching the distal third. Right paramere bearing two apical setae; left bearing only one seta.

Etymology.

Dedicated to the memory of Martin Baehr, renowned beetle taxonomist, in honour of his contributions to the knowledge of Australian ground beetles.

Distribution.

Erwinanillus baehri sp. nov. is known only from bore WWMB4, 80 km E of Hyden, Forrestania, Southern Goldfields region, WA.

Figures

Figures 1 - 3. Erwinanillus baehri gen. et sp. nov., HT ♂. 1 habitus 2 right metafemur and metatrochanter in ventral view 3 aedeagus in left lateral view. Scale bars: 0.1 mm.