Pseudastenus ferrugineus Busanello & Caron, 2020

Busanello, Dilson G. C., Irmler, Ulrich & Caron, Edilson, 2020, Revision of Pseudastenus Bernhauer, synonym with Xenasterides Newton and six new species (Coleoptera, Staphylinidae, Paederinae), Zootaxa 4755 (1), pp. 139-154 : 148

Pseudastenus ferrugineus Busanello & Caron , sp. nov.

Figs. 41 , 49

Material examined. Holotype. Male, dissected, deposited in DZUP, label: (1) “Brasil, Pará, Uruará/Cacau, II–III- 2015/Inverno, Serapilheira,/Reinaldo, Wully, Lucas, col.” [white label printed in black]; (3) “ HOLOTYPE / Pseudastenus ferrugineus Busanello & Caron /det. E. Caron, 2019” [red label/ printed in black] . Paratype: BRAZIL: 1 specimen from Pará ( DZUP) .

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Diagnosis. Pseudastenus ferrugineus differs from the other species with elytra longer than wide by the rust brown to reddish pronotum and the coloration of the elytra with basal two-thirds darker than apical one-third.

Description. Body length: 3.25 mm. Coloration: head dark brown; basal two thirds of elytra and abdomen dark brown to black, both darker than head; pronotum rust brown to reddish; apical one-third and appendices yellowish brown. Head 0.47 mm long, 0.52 mm wide; eyes prominent; 0.32 times as long as total length of head; 0.78 times as long as postocular length; approximately parallel; posterior margin straight; depressed on central vertex in front of neck. Pronotum 0.47 mm long, 0.54 mm wide; widest close to anterior angles; anterior margin slightly curved; posterior margin straight; sides convergingposteriad. Elytra 0.60 mm long, 0.52 mm wide; conspicuously longer thanpronotum, but slightly narrower than pronotum; sides slightly convexly curved; widest in the middle; humeral angles rounded and obtuse, but conspicuously developed; hind wings developed; posterior angles nearly rectangular; posterior margin emarginate; suture 0.86 times as long as lateral side; microtuberculate punctation larger than on head and pronotum; with yellow pubescence pointing posteriad, longer than head and pronotum; posterior edge with fringe of sparse robust setae. Abdomen with dense punctation; with yellow pubescence pointing posteriad; pubescence conspicuously longer than on the rest of body. Aedeagus elongate; 0.59 mm long; 5.85 times as long as wide; median lobe with sides slightly converging towards the apex, elongate apical sclerites, 0.13 mm long ( Fig. 49 ).

Etymology. The specific name derives from the Latin adjective “ferrugineus” meaning rust-brown and refers to the rust brown to reddish color of the pronotum.

Geographical records. Pseudastenus ferrugineus is known only from the northwestern part of the state of Pará ( Brazil).

Biological notes. The specimens of Pseudastenus ferrugineus were collected in leaf litter.

Figures

FIGURES 40–45. Dorsal view. 40. Pseudastenus ribeirocostae sp. nov.; 41. P. ferrugineus sp. nov.; 42. P. latus sp. nov.; 43. P. oculatus sp. nov.; 44. P. amazonicus sp. nov.; 45. P. schubarti sp. nov. Scale bars: 2 mm.

FIGURES 48–54. Aedeagus of Pseudastenus, dorsal and lateral view, respectively, figures 51–54 including microscopic detail of basal slerites. 48. P. ribeirocostae sp. nov.; 49. P. ferrugineus sp. nov.; 50. P. latus sp. nov.; 51. P. barretoi; 52. P. oculatus sp. nov.; 53. P. amazonicus sp. nov.; 54. P. schubarti sp. nov. Scale bar: 0.3 mm.