Theridion impressum L. Koch 1881, L. Koch, 1881

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

publication ID

http://doi.org/ 10.5281/zenodo.273386

publication LSID

lsid:zoobank.org:pub:6744F78C-4CF2-4697-BC43-E637483651C3

persistent identifier

http://treatment.plazi.org/id/038687FF-DC54-FF9C-FEF5-FBA5827E7002

treatment provided by

Plazi

scientific name

Theridion impressum L. Koch 1881
status

 

Theridion impressum L. Koch 1881  

( Figs 74–79 View FIGURES 74 – 84. 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, 2 ɗ, 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, 1 ɗ, 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, 1 ɗ, P. Paquin & N. Dupérré ( CPAD)

Diagnosis.— This species can be recognised by the abdominal pattern ( Figs 74–75 View FIGURES 74 – 84. 74 – 79 ). Males are characterised by the hollow, curved conductor (C) extending beyond the tip of the cymbium ( Fig. 76 View FIGURES 74 – 84. 74 – 79 ). Females are diagnosed by a well­sclerotized epigynal plate ( Fig. 77 View FIGURES 74 – 84. 74 – 79 ), the somewhat rectangular shape of the atrium (AT) ( Fig. 77 View FIGURES 74 – 84. 74 – 79 ) and the oval spermathecae (S) positioned at the anterior margin of epigynal plate ( Figs 78–79 View FIGURES 74 – 84. 74 – 79 ).

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

Remark.— When Levi (1957 a) 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.

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Theridiidae

Genus

Theridion