Gnypeta nigrella (LeConte)

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 : 64-68

publication ID	https://doi.org/ 10.3897/zookeys.2.4
publication LSID	lsid:zoobank.org:pub:664C49F1-5384-43C4-8BF1-CE76AC11D32E
DOI	https://doi.org/10.5281/zenodo.3792842
persistent identifier	https://treatment.plazi.org/id/D43E034B-FFA8-4155-FF17-FACA6552FE36
treatment provided by	Plazi
scientific name	Gnypeta nigrella (LeConte)
status

Treatment

16. Gnypeta nigrella (LeConte) View in CoL

( Figs 1 View Fig , 2 View Fig , 18 View Figs 15-20 , 36 a, b View Figs 21-38 , 164-171 View Figs 164-171 , 192 View Fig )

Tachyusa nigrella LeConte 1863: 29 View in CoL ; Bland 1865: 412; Moore and Legner 1975: 422. LECTOTYPE (male): UNITED STATES OF AMERICA: “in original description: “middle and Western States”; original labels: male; nigrella Lec. View in CoL ; Type 6247; Aug.-Dec., MCZ Image Data Base (MCZ). Present lectotype designation by J. Klimaszewski, 2008. Examined.

Material examined

Specimens are listed in Appendix A.

Diagnosis

This species can be recognized by the following combination of characters: body length 2.7-3.0 mm ( Figs 1 View Fig , 2 View Fig View Figs 181-189 View Fig View Fig View Fig View Fig View Fig View Fig View Fig View Fig , 18 View Figs 15-20 ); elytra at suture as long as pronotum or slightly longer and about 1/4 wider than maximum width of pronotum ( Figs 1 View Fig , 2 View Fig View Figs 181-189 View Fig View Fig View Fig View Fig View Fig View Fig View Fig View Fig , 18 View Figs 15-20 ); abdomen at base distinctly narrower than elytra and subparallel ( Figs 1 View Fig , 2 View Fig View Figs 181-189 View Fig View Fig View Fig View Fig View Fig View Fig View Fig View Fig , 18 View Figs 15-20 ); antennal article 4 strongly elongate, 5-10 moderately to strongly elongate ( Figs 36 a, b View Figs 21-38 ); median lobe of aedeagus with apical part triangularly produced with sinuate edges in lateral view ( Fig. 164 View Figs 164-171 ); spermatheca club-shaped, capsule spherical and connected to a narrowly elongate sinuate stem ( Fig. 169 View Figs 164-171 ); male tergite 8 truncate apically and with slight apical emargination ( Fig. 167 View Figs 164-171 ); female sternite 8 with large apical emargination ( Fig. 171 View Figs 164-171 ). Gnypeta nigrella has extremely similar spermatheca, and tergite and sternite 8 are similar to those of G. minuta and G. saccharina . Gnypeta nigrella is distinct by its very short and silky body pubescence and by only a few coarse punctures at the margins of basal tergites ( Fig. 1 View Fig ).

Description

Body length 2.7-3.0 mm; dark brown to almost black, central and/or posterior portion of elytra often rust brown ( Figs 1 View Fig , 2 View Fig View Figs 181-189 View Fig View Fig View Fig View Fig View Fig View Fig View Fig View Fig , 18 View Figs 15-20 ); integument moderately glossy; pubescence yellowish grey and moderately long and dense; antennal articles 4-7 strongly elongate, 8-10 moderately elongate ( Figs 36 a, b View Figs 21-38 ); head and pronotum of about the same width ( Figs 1 View Fig , 2 View Fig View Figs 181-189 View Fig View Fig View Fig View Fig View Fig View Fig View Fig View Fig , 18 View Figs 15-20 ); elytra and abdomen (less so) wider than either head or pronotum; head rounded posteriorly; pronotum broadest in apical third, pubescence directed posterad along midline and laterad elsewhere; elytra at suture longer than pronotum and about 1/4 wider than maximum width of pronotum, pubescence directed obliquely posterolaterad, in weak wavy pattern medially on each side of disc ( Figs 1 View Fig , 2 View Fig View Figs 181-189 View Fig View Fig View Fig View Fig View Fig View Fig View Fig View Fig , 18 View Figs 15-20 ); abdomen broadening posteriorly, distinctly narrower than elytra at base ( Figs 1 View Fig , 2 View Fig View Figs 181-189 View Fig View Fig View Fig View Fig View Fig View Fig View Fig View Fig , 18 View Figs 15-20 ); metatarsus with basal article slightly longer than the following article ( Fig. 1 View Fig ). Male. Tergite 8 emarginate apically ( Fig. 167 View Figs 164-171 ). Sternite 8 elongate and broadly rounded apically ( Fig. 168 View Figs 164-171 ). Median lobe of aedeagus with swollen ventral part of tubus and with produced apex in lateral view ( Fig. 164 View Figs 164-171 ); bulbus moderately large in dorsal view ( Fig. 165 View Figs 164-171 ); internal sac with complex structures as illustrated ( Figs 164, 165 View Figs 164-171 ). Female. Tergite 8 truncate apically ( Fig. 170 View Figs 164-171 ). Sternite 8 broadly rounded posteriorly with deep V-shaped apical emargination ( Fig. 171 View Figs 164-171 ). Spermatheca club-shaped, capsule spherical apically and constricted basally, connected to a narrow tubular and sinuate stem ( Fig. 169 View Figs 164-171 ).

Distribution (Fig. 192)

Gnypeta nigrella is an eastern Nearctic species previously recorded from Massachusetts, Pennsylvania, and Maryland ( LeConte 1863; Bland 1865; Moore and Legner 1975). We report this species for the first time from Canada (New Brunswick) and from Vermont in the United States.

Collection and habitat data

Adults captured in New Brunswick occurred on bare, sun exposed, fine sand/gravel near margin of a medium-sized stream, others were found on bare mud and among cobblestones

(also in direct sun) on the shore of the Saint John River, and some from drift material, mostly maple seeds, in the Saint John River. The adults were diurnally active and in company with various Bembidion and Tachyusa species. Collecting period: May, June and July.

Comments

Gnypeta nigrella differs from G. brevicornis and G. uteana by moderately elongate basal article of metatarsus, which is extremely elongate in the two latter species. It differs from other Gnypeta species by its slender body, and almost total lack of punctation in the first three visible tergal impressions.