Pachybrachis luctuosus
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Ordo: Coleoptera
Familia: Chrysomelidae
Genus: Pachybrachis
Name
Pachybrachis luctuosus Suffrian, 1858 – Wikispecies link – Pensoft Profile
- Pachybrachys luctuosus Suffrian, 1858: 401.
Recognition
Color black or piceous; ocular lines absent; pronotum and sides of elytra with few yellow marks; elytral punctures confused in scutellar area, in fairly regular rows in apical half; elytral striae deep and quite regular (Habitus 6); aedeagus with terminal nodule and denticle forming small, 90o diamond shape (Figure 10a); male size small: length 1.87 ± 0.10 mm, width 0.95 ± 0.11 mm.
Distribution
A relatively rare Atlantic species distributed from Alabama to New York in the United States (Riley et al. 2003[1]; Barney, unpublished data). The Parry Sound specimens in Ontario and those of the Île-du-Grand-Calumet in the Ottawa River are two small populations disjunct from the main Atlantic one (Map 6).
Material examined
ONTARIO: Hastings Co., 20.VI.1952, J. F. Brimley [1♂, CNC]; Parry Sound Dist., Hwy. 69, 12 km S Shawanaga, 13.VII.1995, B. F. & J. L. Carr [1♂, CNC]. Leeds Co., 7.VIII.1950, ex. pine, J. F. Brimley [3♂ 12♀, CNC].
QUÉBEC: Pontiac Co., L’Île-du-Grand-Calumet, 3.VIII.1985, on Pinus resinosa Ait., Larochelle & Larivière [1♂ 1♀, CNC]; Luskville, 4.VII.1985, on Quercus rubra L., Larochelle & Larivière [1♂, CNC].
Host plants
A large series was taken on pine in Leeds Co., ON. Pachybrachis luctuosus was first reported from Pinus virgiana P. Mill. in Alabama (Balsbaugh and Hays 1972[2]). This record was extended to the northeastern states by Wilcox (1979)[3], and assumed to be valid as well in West Virginia (Clark 2000[4]). Specimens from Larochelle & Larivière had label notations reporting collections from Pinus resinosa Ait. and Quercus rubra L.
Comments
Pachybrachis luctuosus is another of Fall’s (1915) Group C species that have “great variation in the degree of (elytral) maculation.” Fall commented that he would not be surprised if Pachybrachis carolinensis Fallwas a paler form of Pachybrachis luctuosus. Our comparison of aedeagi of specimens identified by Fall as either Pachybrachis luctuosus or Pachybrachis carolinensis revealed the same, distinctive form – the subplanar surface with one median subapical denticle. Pachybrachis carolinensis appears to be a larger, more yellow variation, but more work needs to be done. Pachybrachis luctuosus is reported for the first time in Canada, and therefore, is also a first record for ON and QC.
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.
- ↑ Balsbaugh E, Hays K (1972) The leaf beetles of Alabama (Coleoptera: Chrysomelidae). Auburn University Agricultural Experiment Station Bulletin 441: 1-223.
- ↑ Wilcox J (1979) Leaf beetle host plants in Northeastern North America (Coleoptera: Chrysomelidae). North American Beetle Fauna Project. World Natural History Publications, Kinderhook, New York, 30 pp.
- ↑ Clark S (2000) An annotated list of the leaf beetles of West Virginia (Coleoptera: Orsodacnidae, Megalopodidae, Chrysomelidae exclusive of Bruchinae). Occasional Publications of the West Virginia Department of Agriculture 1: 1-93.
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