Atheta (Hydrosmectomorpha)

Klimaszewski, Jan, Webster, Reginald P., Davies, Anthony & Bourdon, Caroline, 2018, Description of Hydrosmectomorpha Klimaszewski and Webster, a new subgenus of Atheta C. G. Thomson, with three new Canadian species (Coleoptera: Staphylinidae: Aleocharinae), Insecta Mundi 648, pp. 1-12 : 3-4

Key to species of Atheta (Hydrosmectomorpha)

1. Antennomeres VIII–X subquadrate to slightly elongate ( Fig. 16 ); apical margin of male tergite VIII truncate and slightly (NB specimens) to strongly sinuate (BC specimens), and a small tooth near each lateral angle ( Fig. 19a,b ); apical part of median lobe of aedeagus very narrow and pointed and arcuate in lateral view, ventral margin of median lobe of aedeagus for the most part curved in lateral view ( Fig. 17, 18 ); apical margin of female sternite VIII with broad medial emargination bordered on each side by an angular projection ( Fig. 21 ); spermatheca small, capsule tubular and club-shaped, apical invagination small; stem curved at base of capsule, straight to small spherical posterior swelling ( Fig. 23 )............... A. meduxnekeagensis Webster and Klimaszewski, new species

— Antennomeres VIII–X distinctly elongate ( Fig. 8 , 24 , 32 ); ventral margin of median lobe in large part straight in lateral view ( Fig. 9 , 25 , 33 ); other structures not as above.............. 2

2(1). Antennomeres VIII–X each about twice as long as wide ( Fig. 24 ); apical margin of male tergite VIII with broadly V-shaped median emargination forming two lobe-like processes, without lateral teeth ( Fig. 26 ); apical margin of female tergite VIII truncate medially ( Fig. 28 ); spermatheca with capsule broadly club-shaped, apical invagination small; stem short, straight or sinuate ( Fig. 30, 31 ).................. A. vincenti Webster and Klimaszewski, new species

— Antennomeres VIII–X each less than twice as long as wide ( Fig. 8 , 32 ); other structures not as above...................................................................... 3

3(2). Apical margin of male tergite VIII with two small lateral and six or many minute denticles near middle ( Fig. 11 ); basal margin of male sternite VIII deeply emarginate medially ( Fig. 12 ); median lobe of aedeagus in lateral view almost straight except apex bent abruptly ventrad ( Fig. 9 ); apical margin of female tergite VIII distinctly broadly emarginate medially ( Fig. 13 ); spermatheca highly sinuate ( Fig. 15 ). A. newfoundlandica (Klimaszewski and Langor)

— Apical margin of male tergite VIII sinuate, without denticles ( Fig. 34 ); basal margin of male sternite VIII slightly emarginate medially ( Fig. 35 ); median lobe of aedeagus in lateral

view broadly curved at base and at apex ( Fig. 33 ); apical margin of female tergite VIII slightly emarginate medially ( Fig. 36 ); spermatheca bent at middle, stem straight ( Fig. 38 )..................... A. quebecensis Webster and Klimaszewski, new species

Figures

Figures 16–23. Atheta (H.) meduxnekeagensis Webester and Klimaszewski, sp. nov. (NB specimen). 17, 18) median lobe of aedeagus in lateral view (17BC, 18 NB). 19a, b) Male tergite VIII (a - NB, b - BC). 20a, b) Male sternite VIII. 21) Female tergite VIII (a - NB, b - BC). 22) Female sternite VIII. 23) Spermatheca. Scale line for habitus = 1 mm, remaining scale lines = 0.2 mm. Arrows indicate important diagnostic features.

Figures 8–15. Atheta (H.) newfoundlandica (Klimaszewski and Langor). 8) Habitus in dorsal view. 9) Median lobe of aedeagus in lateral view. 10) Median lobe of aedeagus in dorsal view. 11) Male tergite VIII. 12) Male sternite VIII. 13) Female tergite VIII. 14) Female sternite VIII. 15) Spermatheca. Scale line for habitus = 1 mm, remaining scale lines = 0.2 mm. Arrows indicate important diagnostic features.

Figures 24–31. Atheta (H.) vincenti Webester and Klimaszewski, sp. nov. 24) Habitus in dorsal view. 25) Median lobe of aedeagus in lateral view. 26) Male tergite VIII. 27) Male sternite VIII. 28) Female tergite VIII. 29) Female sternite VIII. 30, 31) Spermatheca. Scale line for habitus = 1 mm, remaining scale lines = 0.2 mm. Arrows indicate important diagnostic features.

Figures 32–38. Atheta (H.) quebecensis Webester and Klimaszewski, sp. nov. 32) Habitus in dorsal view. 33) Median lobe of aedeagus in lateral view. 34) Male tergite VIII. 35) Male sternite VIII. 36) Female tergite VIII. 37) Female sternite VIII. 38) Spermatheca. Scale line for habitus = 1 mm, remaining scale lines = 0.2 mm. Arrows indicate important diagnostic features.