Pachybrachis subfasciatus
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Ordo: Coleoptera
Familia: Chrysomelidae
Genus: Pachybrachis
Name
Pachybrachis subfasciatus (J. E. LeConte, 1824) – Wikispecies link – Pensoft Profile
- Cryptocephalus subfasciatus J. L. LeConte, 1824: 173.
- Pachybrachys biguttatus Suffrian, 1852: 167.
- Pachybrachys impurus Suffrian, 1852: 186.
- Pachybrachys xanthias Suffrian, 1852: 199.
- Pachybrachys impurus var. Pachybrachis umbrosus Fall, 1915: 379.
Recognition
Color dark, pronotum with sides narrowly yellow; elytra with red or yellow, more or less broad, irregular or indented transverse median fascia often interrupted at suture, and with red or yellow apical spot (Habitus 15); Disc of pronotum often, and head more rarely, variegated with reddish yellow; male size small: length 2.21 ± 0.09 mm, width 1.18 ± 0.06 mm.
Distribution
Eastern species distributed from Kansas to Louisiana to Atlantic Coast in the United States (Riley et al. 2003[1]), restricted to the Carolinian Zone in southern Ontario in eastern Canada (Map 15).
Material examined
ONTARIO: Essex Co., Leamington, 6.VII.1931, G. S. Walley [1♀, CNC]; same data, except 9.VI.1937 [1♀, CNC]; Hastings Co., 19.VII.1938, J. F. Brimley [2♀, CNC]; Lennox & Addington Co., 16.VII.1938, J. F. Brimley [1♂, CNC]; Norfolk Co., Normandale, 5.VI.1931, W. J. Brown [1♀, CNC]; Walsingham, 3.VI.1944, W. J. Brown [3♀, CNC]; same data, except 11.VII.1956 [2♀, CNC]; Northumberland Co., Hamilton, 15.VII.1981, M. Sanborne [1♂, CNC]; Toronto Co., Toronto, 15.VI.1896 [3♀, LEM]; same data, except 30.V.1897, C. T. Hills [1♂ 1♀, LEM].
Host plants
No records are available from the specimens examined. Downie and Arnett (1996)[2] reported Pachybrachis subfasciatus from black walnut (Juglans nigra L.) (Juglandaceae).
Comments
Pachybrachis subfasciatus is another possible example of a species once living in the Carolinian Zone which may have been extirpated from the Canadian fauna. No specimens were collected in the last 55 years. If its association with black walnut is correct, this may explain its rarity, or even extinction, since Fox and Soper (1953)[3] reported this tree occurring naturally only in rich woods in southernmost Ontario and considered recent trees above these limits to have been planted.
Taxon Treatment
- Barney, R; LeSage, L; Savard, K; 2013: Pachybrachis (Coleoptera, Chrysomelidae, Cryptocephalinae) of Eastern Canada ZooKeys, 332: 95-175. doi
Other References
- ↑ Riley E, Clark S, Seeno T (2003) Catalog of the leaf beetles of America north of Mexico (Coleoptera: Megalopodidae, Orsodacnidae and Chrysomelidae, excluding Bruchinae). Coleopterists Society, Special Publication no. 1, 290 pp.
- ↑ Downie N, Arnett R (1996) The Beetles of Northeastern North America. Volume II. Polyphaga: Series Bostriciformia through Curculionidea. The Sandhill Crane Press, Gainesville, Florida, 831 pp.
- ↑ Fox W, Soper J (1953) The distribution of some trees and shrubs of the Carolinian zone of southern Ontario. Part II. Transactions of the Royal Canadian Institute 62: 3-32.
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