Gnypeta saccharina Klimaszewski and Webster, 2008

Klimaszewski, Jan, Savard, Karine, Pelletier, Georges & Webster, Reginald, 2008, Species review of the genus Gnypeta Thomson from Canada, Alaska and Greenland (Coleoptera, Staphylinidae, Aleocharinae): systematics, bionomics and distribution, ZooKeys 2 (2), pp. 11-84 : 68-69

17. Gnypeta saccharina Klimaszewski and Webster , sp. nov. urn:lsid:zoobank.org:act:3F61ACAE-3402-4A0B-8464-78A52DF9AEA5

( Figs 19 , 37 a, b , 172-180 , 199 )

HOLOTYPE (male): CANADA, New Brunswick, Queens Co., Canning Grand Lake near Scotchtown , 45.8762˚ N. 66.1817˚ W., 25.V.2006, R. P. Webster coll.; silver maple swamp near lake margin, margin of vernal pond in moist leaves, IRM No. 1 ( LFC) . PARATYPES: New Brunswick, York Co., Fredericton, at Saint John River, 45.9588˚ N, 66.6254˚ W., 7. VI.2005, R.P. Webster coll., margin of river in flood debris ( LFC, RWC) 3 females.

Etymology

The specific name “ saccharina ” derives from the Latin specific name of silver maple, Acer saccharinum L., in reference to the forest type where the holotype was captured.

Diagnosis

This species can be recognized by the following combination of characters: body length 2.4-2.7 mm ( Fig. 19 ); elytra at suture as long as pronotum and about 1/6 wider than maximum width of pronotum ( Fig. 19 ); abdomen at base slightly narrower than elytra and subparallel, tergal impressions without coarse punctation ( Fig. 19 ); antennal article 4 strongly elongate, 5-7 moderately elongate, 8-10 subquadrate ( Figs 37 a, b ); median lobe of aedeagus with apical part narrowly triangularly produced with slightly sinuate edges in lateral view ( Fig. 172 ); spermatheca pipe-shaped, capsule spherical with large apical invagination, stem narrowly elongate and sinuate ( Fig. 178 ); male tergite 8 truncate apically ( Fig. 176 ); female sternite 8 with large apical emargination ( Fig. 180 ). The subquadrate antennal articles 7-10; distinct shape of spermatheca; medially emarginated female sternite 8, and the shape of the apical portion of the median lobe of the aedeagus are the best characters for recognition of this species.

Description

Body length 2.4-2.7 mm; dark brown ( Fig. 19 ); integument moderately glossy; pubescence yellowish grey and very short and dense; antennal articles 5-7 moderately elongate, 8-10 subquadrate ( Figs 37 a, b ); head slightly narrower than pronotum ( Fig. 19 ); elytra and abdomen (less so) wider than either head or pronotum; head rounded posteriorly; pronotum broadest in the middle, pubescence directed obliquely posterolaterad from the midline; elytra at suture as long as pronotum and about 1/6 wider than maximum width of pronotum, pubescence directed obliquely postero-laterad, in weak wavy pattern medially on each side of disc ( Fig. 19 ); abdomen subparallel, distinctly narrower than elytra at base ( Fig. 19 ); metatarsus with basal article slightly longer than the following article. Male. Tergite 8 truncate apically ( Fig. 176 ). Sternite 8 elongate and broadly rounded apically ( Fig. 177 ). Median lobe of aedeagus with narrowly triangular apex in lateral view ( Fig. 172 ); bulbus moderately large in dorsal view ( Fig. 173 ); internal sac with complex structures as illustrated ( Figs 172, 173 ). Female. Tergite 8 truncate apically ( Fig. 179 ). Sternite 8 broadly rounded posteriorly with deep V-shaped apical emargination ( Fig. 180 ). Spermatheca club-shaped, capsule spherical apically and constricted basally, connected to a narrow tubular and sinuate stem ( Fig. 178 ).

Distribution (Fig. 199)

Gnypeta saccharinum was described from two localities in New Brunswick and these are the only known localities for this species.

Collection and habitat data

Adults were captured in May from moist leaves near margin of vernal pond in silver maple ( Acer saccharinum L.) swamp, and in June from flood debris at the margin of the Saint John River.

Figures

Figs 15-20. Gnypeta species: 15, G. carbonaria; 16, G. helenae; 17, G. canadensis; 18, G. nigrella; 19, G. saccharina; and 20, G. minuta [18-20, apical part of abdomen removed]. Scale = 1 mm

Figs 21-38. Antennae of Gnypeta species: G. ashei: 21a. male, 21b. female; G. brincki: 22a. male, 22b. female; G. atrolucens: 23a. male, 23b. female; G. sellmani: 24a. male, 24b. female; G. dentata: 25a. male, 25b. female; G. groenlandica: 26a. male, 26b. female: G. brevicornis: 27a. male, 27b. female; G. caerulea: 28a. male, 28b. female; G. lohsei: 29a. male, 29b. female; G. crebrepunctata: 30a. male, 30b. female; G. manitobae: 31b. female; G. uteana: 32a. male, 32b. female; G. carbonaria: 33a. male, 33b. female; G. helenae: 34a. male, 34b. female; G. canadensis: 35a. male, 35b. female; G. nigrella: 36a. male, 36b. female; G. saccharina: 37a. male, 37b. female; G. minuta: 38a. male, 38b. female. Scale = 1 mm

Figs 172-180. Genital structures of Gnypeta saccharina: 172, median lobe of the aedeagus in lateral view, 173, dorsal view, 174, apical part of median lobe in ventral view; 175, paramere; 176, male tergite 8; 177, male sternite 8; 178, spermatheca; 179, female tergite 8; 180, female sternite 8.

Fig. 199. Collection localities in Canada and Alaska of G. carbonaria and G. saccharina.