Weevils (Coleoptera: Curculionoidea, Excluding Scolytinae and Platypodinae) of the Yukon

Publication Type:Book Chapter
Year of Publication:1997
Authors:R. S. Anderson
Editor:H. V. Danks, Downes J. A.
Book Title:Insects of the Yukon. Biological Survey of Canada (Terrestrial Arthropods) (1034 pp.)
Pagination:pp. 523-562

The fauna of Curculionoidea (excluding Scolytinae and Platypodinae and species in the curculionid genus Lepyrus) in the Yukon Territory consists of 64 species in 37 genera. Anthribidae are represented by 2 widespread species in 2 genera. Brentidae are represented by 3 species of the genus Apion, one widespread northern transcontinental and 2 widespread in western North America. Within Curculionidae there are 59 species in 34 genera. No Rhynchophorinae are known from the Yukon. Brachycerinae are represented by 10 species in 9 genera, and Cossoninae are represented by one species in one genus. There are 48 species in 24 genera of Curculioninae, with Dorytomus (9 species), Ceutorhynchus (9 species) and Magdalis (4 species) the best-represented genera. These totals do not include species of the genus Lepyrus which currently are being revised. For Curculionidae, 19 species (33%) occur in both Nearctic and Palaearctic regions (4 species introduced into North America). Of these species, 12 are widespread in Nearctic and Palaearctic regions, 4 are widespread in the northern Palaearctic but restricted in North America to eastern Beringia or marginally beyond (Palaearctic-East Beringian), and 2 are found in only western and eastern Beringia (East-West Beringian). Among Nearctic species, 11 species (19%) are found in northern transcontinental and western montane North America; 7 species (12%) are found throughout northern transcontinental North America; 9 species (15%) are widespread North American. Four species (6%) are widespread western North American (Western Nearctic); 2 species are widespread western montane North American (3%) (Cordilleran); and 5 species (9%) are restricted in distribution to eastern Beringia or marginally beyond (East Beringian). Distributions of 2 species (5%) are incompletely known.Ten species (17%) are associated with treeless habitats; 24 species (41%) with boreomontane forest; 12 species (20%) with wetlands; and 13 species (22%) with a variety of habitats. Thirteen species (22%) and 10 species (17%) of Yukon weevils use Salicaceae and Pinaceae respectively as hosts. Species of Fabaceae and Cruciferae are predominant among the other hostplants used by remaining weevil species.Four distinct assemblages are distinguished in the curculionoid fauna. Widespread: an assemblage consisting of 47 widespread species found in boreal and/or boreomontane forest, wetlands, or a variety of habitats and generally characteristic of northern transcontinental North America (and for some species also Eurasia). Western Nearctic: an assemblage consisting of 3 species occurring in prairie habitats in the western United States and western Canada and southern steppe in the Yukon. Palaearctic-East Beringian: an assemblage composed of 5 species widespread in the northern Palaearctic Region but likely recent dispersals to North America and, with one exception (which is widespread in western North America), restricted there to eastern Beringia. Lastly, Beringian: an assemblage composed of 7 species, more or less restricted in their distributions to the Beringian (including eastern Siberia) area. Five of these species are found in treeless habitats, one in boreomontane forest and one in various habitats. Five of these 7 endemic species are in relatively widespread speciose northern genera and are likely late Pleistocene Beringian isolates. Two of the endemic species are in monobasic genera of uncertain phylogenetic affinity and appear to have existed in the region since perhaps the Pliocene. Distributions of 2 species are incompletely known and these species are not included in the analysis of the faunal relationships. Ceutorhynchus barkalovi Korotyaev is recorded from North America for the first time.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith