Magnanillus serenitatis, 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

Magnanillus serenitatis sp. nov. Figs 27-29

Type locality.

WA, Pilbara, 65 km NW of Tom Price, Serenity mining area, Champion deposit, 22°07'5.1"S, 117°26'12.5"E.

Type series.

HT ♂, WA, Pilbara, 65 km NW of Tom Price, Serenity mining area, Champion deposit, 22°07'5.1"S, 117°26'12.5"E (WGA84), J. Quartermaine and D. Main, 13 Jun 2011, Trog. trap (HPRC0712), Western Australian Museum Entomology Reg. no. 82667 (WAM). PTT: 2 ♂♂, WA, Pilbara, 50 km N of Tom Price, Solomon Mining Area, Firetail Mine, 22°09'0.0"S, 117°28'55.3"E (WGS84), J. Cocking, D. Main, 23 June 2010, Trog. net scrape (HPRC0243), Western Australian Museum Entomology Reg. no. 82665-82666 (WAM, CGi); 1 ♀, WA, Pilbara, 65 km NW of Tom Price, Serenity mining area, Delta deposit, 22°08'31.0"S, 117°28'1.5"E (WGS84), J. Cocking, D. Main, 19 August 2010, Trog. trap (HPRC2004), Western Australian Museum Entomology Reg. no. 82668 (WAM).

Differential diagnosis.

Magnanillus serenitatis sp. nov. is easily distinguishable from M. firetailianus sp. nov. by its pronotum with basal border as wide as the anterior border. It can be distinguished from M. sabae sp. nov., M. salomonis sp. nov. and M. regalis sp. nov. by its longer metatrochanters, overreaching the femoral tooth.

Description.

TL mm 2.27-2.30 ♂♂, 2.32 ♀. Body elongate, depigmented, testaceous; integument shiny, with evident microsculpture and very short pubescence.

Head relatively small, narrower than pronotum; without excess setae. Labium without tooth, mentum articulated. Antennae robust, submoniliform, short, reaching the base of the pronotum when stretched backwards. Fronto-clypeal furrow indistinct; anterior margin of the epistome subrectilinear.

Pronotum transverse (max. width / max. length ratio = 1.23), maximum width at the base of the anterior third, and basal border slightly wider than anterior border; sides slightly and irregularly arcuate in anterior part, very poorly arcuate in the basal half, not sinuate and denticulate before the basal angles. Anterior angles obtuse, slightly prominent; posterior angles right, acute. Disc convex, with very short and sparse pubescence; 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 slightly placed inside the disk and before the posterior angles.

Legs long and slender, with metatrochanters long, acuminate, and curved and metafemora dentate; metatrochanters (Fig. 28 ) longer than femoral tooth. Two dilated protarsomeres, without adhesive phanerae in males.

Elytra subrectangular, relatively short (max. length / max. width ratio = 1.67), not truncated and only very slightly emarginated before apex. Disc convex, with longitudinal grooves; shiny integument with evident microsculpture and very short, sparse, upright pubescence, not longitudinally aligned. Humeri well marked but rounded; post-humeral margin denticulate, with distinct crenulations up to the base of the apical fourth; elytral apices separately rounded. Marginal groove wide and evident almost down to the 7th 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 nearly equidistant; 4th pore farther and placed at the end of the basal third of the elytron; 5th pore placed at the base of the apical third of the elytron; 5th and 6th ones spaced out ca. half of the distance between the 6th and the 7th; 7th and 8th displaced onto the disc; 7th and 8th spaced from each other as the 8th and 9th. Three discal setae, first placed before the 4th pore of the umbilicate series, second one placed after the midpoint of the elytron, third one placed before the 7th pore.

Aedeagus (Fig. 29 ) large, median lobe long, slender, gently curved, with basal bulb small but tight and evident; ventral margin gently curved from basal bulb to apex; apical blade poorly evident, very short. Endophallus without an evident lamella copulatrix, but with very small, V-shaped, apical, slightly sclerified stripe. Left paramere elongate, reaching the distal third and bearing two setae; right paramere shorter and bearing two apical setae.

Etymology.

The name comes from the Serenity Valley, type locality of the species, in the Pilbara region.

Distribution.

Magnanillus serenitatis sp. nov. is known only from two drill holes in the Serenity Valley, 65 km N/NW of Tom Price, Pilbara, WA.

Figures

Figures 27 - 29. Magnanillus serenitatis sp. nov., HT ♂ 27 habitus 28 right metafemur and metatrochanter in ventral view 29 aedeagus in lateral view. Scale bars: 0.1 mm.