Pachybrachis m-nigrum
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Ordo: Coleoptera
Familia: Chrysomelidae
Genus: Pachybrachis
Name
Pachybrachis m-nigrum (F. E. Melsheimer, 1847) – Wikispecies link – Pensoft Profile
- Cryptocephalus m-nigrum F. E. Melsheimer, 1847: 170.
- Pachybrachys intricatus Suffrian, 1852: 180.
Recognition
Pronotum usually with thick, black, M-shaped marking; elytra yellow with variable black markings, but these usually leaving basal, lateral and sutural margins yellow, in addition to a basal and median yellow spots on each elytron (Habitus 8); male size medium: length 2.59 ± 0.11 mm, width 1.42 ± 0.07 mm.
Distribution
A typical eastern species distributed in the eastern half of the United States (Riley et al. 2003[1]). Its presence in the south of the eastern Townships, in Québec, corresponds to the northernmost limit of this species (Map 8).
Material examined
NEW BRUNSWICK: York Co., 15 km W of Tracy, off Rt 645, 45.6837°N, 65.8809°W, 22.vii.2007, red pine forest, sweeping foliage of Comptonia peregrina, R. P. Webster [1?, RWIC].
QUÉBEC: Châteauguay Co., Ormstown, 12.VII.1977, sweeping, E. J. Kiteley [1♀, CNC]; same data, except 30.VII.1978 [1♂, CNC]; Huntingdon Co., Covey Hill, 30.VI.1927, G. S. Walley [1♀, CNC]; same data, except 1.VII.1927, W. J. Brown [1♀, CNC].
Host plants
An old record by Schwarz (1890)[2] concerned Toxicodendron radicans (L.) Kuntze) (Anachardiaceae), but this was probably based on misidentified specimens of Pachybrachis tridens. Clark et al. (2004)[3] reviewed the literature. More recently, Webster swept it from Comptonia peregrina (Myricaceae) (Webster et al. 2012[4]). Recent surveying in Kentucky barrens/prairies by Barney et al. (2011)[5] cited Pachybrachis m-nigrum collected from and found to feed on St. John’s-wort, Hypericum dolabriforme Vent. (Clusiaceae) (Barney and Hall (2011)[5]).
Comments
Based upon external morphlogy, these specimens appear to be Pachybrachis m-nigrum. However, extensive dissections of material from across the eastern half of the US reveal an externally similar species, but with a distinctly different aedeagus, from the midwestern states (Barney, unpublished data).
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.
- ↑ Schwarz E (1890) Food-plants and food-habits of some North American Coleoptera. Proceedings of the Entomological Society of Washington 1: 231-233.
- ↑ Clark S, LeDoux D, Seeno T, Riley E, Gilbert A, Sullivan J (2004) Host plants of leaf beetle species occurring in the United States and Canada. The Coleopterists Society, Special Publication No. 2, 476 pp.
- ↑ Webster R, LeSage L, DeMerchant I (2012) New Coleoptera records from New Brunswick, Canada: Megalopodidae and Chrysomelidae. ZooKeys 179: 321-348.
- ↑ 5.0 5.1 Barney R, Hall S (2011) New host plant records for selected Cryptocephaline leaf beetles (Coleoptera: Chrysomelidae) in Kentucky. The Coleopterists Bulletin 65(1): 15-19. doi: 10.1649/0010-065X-65.1.15
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