Achilia trauco, Kurbatov & Cuccodoro & Sabella, 2018

Kurbatov, Sergey A., Cuccodoro, Giulio & Sabella, Giorgio, 2018, A revision of the Chilean Brachyglutini – Part 3. Revision of Achilia Reitter, 1890: A. frontalis species group (Coleoptera: Staphylinidae: Pselaphinae), Revue suisse de Zoologie 125 (1), pp. 165-188 : 179-183

publication ID	https://doi.org/ 10.5281/zenodo.1196048
DOI	https://doi.org/10.5281/zenodo.5589986
persistent identifier	https://treatment.plazi.org/id/A7582020-FF89-FFEA-FC01-FA025587E8B5
treatment provided by	Plazi
scientific name	Achilia trauco
status	sp. nov.

Treatment

Achilia trauco View in CoL n. sp.

Figs 28 View Figs 24-29 , 36 View Figs 35-43 , 46, 51 View Figs 44-52 , 77, 79, 84

Type material (75 ex.): CENTRAL CHILE: Región Los Ríos: Ranco prov.: MHNG; 1 ♂ (holotype); 34 km WNW La Union, station 36; 700 m; 17.XII.1984; S. & J. Peck; litter mixed evergreen forest. – Región Los Lagos: Osorno prov.: FMNH ( FMHD #96-249 ); GoogleMaps 1 ♂ and 1 ♀ (paratypes); 15.1 km W Puaucho; 40° 34.97’S 73° 37.68’W; 50 m; 30.XII.1996; A. Newton & M. Thayer 984; valdivian rainforest remnant in sm. ravine, w/large ferns, berlese, leaf & log litter. – Región Los Ríos: Ranco prov. : MHNG; GoogleMaps 16 ♂ and 12 ♀ (paratypes); 34 km WNW La Union, station 36; 700 m; 17.XII.1984; S. & J. Peck; litter mixed evergreen forest. - MNHS; GoogleMaps 1 ♂ and 1 ♀ (paratypes); same data; S. & J. Peck; litter mixed evergreen forest. – FMNH ( FMHD #85- 921 , # 85-36 About FMNH ); GoogleMaps 1 ♂ and 4 ♀ (paratypes); same data; S. & J. Peck. – MHNG; GoogleMaps 12 ♂ and 1 ♀ (paratypes); 35 km WNW La Union; 700 m; 07.II.1985; S. & J. Peck; litter mixed forest. – FMNH ( FMHD #85-997 , # 85-36 About FMNH ); GoogleMaps 1 ♂ and 1 ♀ (paratypes); same data; S. & J. Peck; litter mixed forest. – Región Araucanía: Malleco prov. : FMNH ( FMHD #85-1001 , # 85-118 About FMNH ); GoogleMaps 1 ♂ and 9 ♀ (paratypes); Purén, Contulmo Natural Monument; 350 m; 13.II.1985; S. & J. Peck; mixed forest litter, berlese. – MHNG; GoogleMaps 1 ♂ and 7 ♀ (paratypes); same data; S. & J. Peck. – Región Bío Bío: Arauco prov.: FMNH; GoogleMaps 1 ♂ and 5 ♀ (paratypes); 16 km N Tres Pinos; 170 m; 12.XII.1982; A. Newton & M. Thayer; Cupressus , Eucalyptus etc. forest, berlese, leaf & log litter, forest floor GoogleMaps .

Description: Body 1.15-1.4 mm long, generally bicolored with head, pronotum and abdomen blackish; elytra, antennae, and legs reddish, and palpi yellowish. Head with eyes longer than temples. Pronotum wider than head, with maximal width on anterior half and median antebasal fovea as large as lateral ones. First abdominal tergite with basal striae slightly diverging, extending to about one-third of paratergal length, and separated at base by about one-third of tergal width.

Head as in Figs 77 and 79 View Figs 77-82 ; flanked by two deep lateral pits anteriorly at eyes, the upper margin of eyes surmounted by large carina; frontal protuberance very swollen. Antennae as in A. frontalis . Metasternum with deep ovoidal median depression; posterior edge of the depression pubescent. Legs with trochanters simple; all femora ( Fig. 36 View Figs 35-43 ) thickened and sinuate, particularly metafemora; protibiae ( Fig. 46 View Figs 44-52 ) slightly thickened on distal half; mesotibiae ( Fig. 51 View Figs 44-52 ) at middle slightly bulging and bearing tuft of short setae; medial edge of metatibiae densely pubescent on apical half and distinctly narrowed subapically. Abdominal tergites unmodified; first abdominal ventrite impressed at middle, remaining ventrites flattened at middle; ventrite I with median carina extending from posterior margin to posterior edge of median impression. Aedeagus ( Fig. 28 View Figs 24-29 ) 0.23-0.27 mm long; similar to that of A. frontalis , differing only by copulatory pieces being sinuate and subapically narrowed. Parameres wide with long seta on poorly developed outer lobe; tips recurved posteriorly and bearing thin and long subapical seta.

Female: Similar to male except: head with occipital protuberance less developed and lacking lateral pits; eyes less developed; disc of pronotum less convex; metasternum, abdomen, and legs unmodified.

Collecting data: Collected from December to February, mainly in mixed evergreen forests at elevations ranging from 50 m to 700 m. The specimens came from sifted samples of leaf and log litter.

Distribution: Achilia trauco n. sp. is distributed in Central Chile from Osorno to Arauco Provinces ( Fig. 84 View Fig : pink squares).

Comments: Achilia trauco n. sp. is very similar to A. frontalis , from which it differs mainly by the male features of head (see Figs 71-76 View Figs 71-76 , 77, 79 View Figs 77-82 ), of the metafemora (see Figs 37-40, 36 View Figs 35-43 ), the protibiae (see Figs 45 and 46 View Figs 44-52 ), the mesotibiae (see Figs 50, 51 View Figs 44-52 ), and the aedeagi (see Figs 27, 28 View Figs 24-29 ). The females of A. frontalis and A. trauco n. sp. are very similar, except that those of A. trauco n. sp. have a slightly longer head, with a frontal protuberance more convex than those of A. frontalis .