Theridion impressum L. Koch 1881

Paquin, Pierre & Dupérré, Nadine, 2006, The spiders of Québec: update, additions and corrections, Zootaxa 1133, pp. 1-37 : 27

Theridion impressum L. Koch 1881

( Figs 74–79 )

Material examined.— Canada: Québec: Baie­James (Jamésie): 110 km N LaSarre [49°43’N, 79°17’W] 15.–22.vi.1997, flight interception trap in regenerating Black spruce forest, 2ɗ, P. Paquin & N. Dupérré ( CPAD); Baie­James (Jamésie): 110 km N LaSarre [49°43’N, 79°17’W] 22.–29.vi.1997, flight interception trap in regenerating Black spruce forest, 1ɗ, P. Paquin & N. Dupérré ( CPAD); Baie­James (Jamésie): 110 km N LaSarre [49°43’N, 79°17’W] 06.–13.vii.1997, flight interception trap in regenerating Black spruce forest, 1ɗ, P. Paquin & N. Dupérré ( CPAD)

Diagnosis.— This species can be recognised by the abdominal pattern ( Figs 74–75 ). Males are characterised by the hollow, curved conductor (C) extending beyond the tip of the cymbium ( Fig. 76 ). Females are diagnosed by a well­sclerotized epigynal plate ( Fig. 77 ), the somewhat rectangular shape of the atrium (AT) ( Fig. 77 ) and the oval spermathecae (S) positioned at the anterior margin of epigynal plate ( Figs 78–79 ).

Distribution.— Holarctic. Western boreal species known from British Columbia to Saskatchewan with isolated records in Québec (present records).

Remark.— When Levi (1957a) revised the genus, the species was known from the West Coast only. Further records extended its range to Saskatchewan. The record reported here from Québec represent an important range extension of about 1800 km to the East. The collection data given here suggest affinities for open forest habitats.

Figures

FIGURES 74 – 84. 74 – 79. Theridion impressum. 74, male, dorsal view; 75, female, dorsal view; 76, palpus of male, ventral view; 77, epigynum, ventral view; 78, spermathecae, ventral view; 79, spermathecae, dorsal view. 80 – 84. Zodarion rubidum. 80, male, dorsal view; 81, cephalothorax of male, dorsal view; 82, palpus of male, ventral view; 83, palpal tibia of male, retrolateral view; 84, epigynum, ventral view.