Pachybrachis hepaticus hepaticus
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Ordo: Coleoptera
Familia: Chrysomelidae
Genus: Pachybrachis
Name
Pachybrachis hepaticus (F. E. Melsheimer, 1847) – Wikispecies link – Pensoft Profile
- Cryptocephalus hepaticus F. E. Melsheimer, 1847: 171.
- Cryptocephalus punctatus Haldeman, 1849: 257.
Recognition
Front femora not enlarged in comparison to those of middle and hind legs (Figure 3a); eyes small and remote (Figure 1d); antennae short, less than half body length (Habitus 5); integument densely, diffusely punctate (Figure 7c); elytra tapered to apex; male size very small: length 1.68 ± 0.07 mm, width 0.96 ± 0.07 mm.
Distribution
Transcontinental, extending from California to Maine (Riley et al. 2003[1]). In eastern Canada, Pachybrachis hepaticus hepaticus occurs in southern Ontario from Lake Ontario to the Ottawa River Valley in Québec (Map 5).
Material examined
ONTARIO: Carleton Co., Jockevale, 4.VII.1934, W. J. Brown [1♂, CNC]; Ottawa, 24.VI.1995, [ex. field notes: “pinery forest preserve, on sand dunes…”], B. F. & J. L. Carr [1♀, CNC]; Essex Co., Leamington, 3.VII.1931, W. J. Brown [1♀, CNC]; same data, except 17.VI.1940 [1♂, CNC]; Point Pelee, 24.VI.1931, W. J. Brown [1♂, CNC]; Haldimand-Norfolk Cos., Turkey Point, 24.VII.1984, sweeping in marshy area, L. LeSage [1♀, CNC]; Hasting Co., 10.VII.1938, Brimley [1♀, CNC]; Norfolk Co., Forestville, 15.VI.1931, W. J. Brown [1♂, CNC]; Parry Sound Dist., Scotia Junction, 28.VII.1934, H. W. Wenzel [1♂ 1♀, OSUC]; Prince Edward Co., 22.VI.1919, Brimley [1♀, CNC]; same data, except 28.VI.1921 [1♂, CNC]; same data, except 2.VIII.1925 [1♀, CNC]; Renfrew Co., Arnprior, 20.VII.1941, W. J. Brown [1♀, CNC]; Russell Co., Mer Bleue, 18.VI.1986, W. J. Brown [1♂, CNC]; same data, except 10.VII.1936 [1♀, CNC]; Toronto Co., Toronto, F. Knab [1♀, USNM]; same data, except 26.V.1896, R. J. Crew [1♀, ROM]. Unknown Co., East Ontario, 1885 [1♀, CNC].
QUÉBEC: Deux-Montagnes Co., La Trappe, 30.VI.1931, J. Ouellet [1♂, CEUM]; same data, except 27–29.VI.1933 [21♂ 15♀, CEUM]; same data, except 23.VII.1933 [1♀, CEUM]; same data, except 28.VII.1934 [1♀, CEUM]; same data, except 20.VIII.1936 [1♂, CEUM]; same data, except 26.VIII.1946 [1♀, CEUM]; same data, except 7.VII.1949 [1♂, CEUM]; Gatineau Co., Alcove, 24.VIII.1936, W. J. Brown [1♀, CNC]; Gatineau Park, Meach Lake, 30.VII.1972, A. Davies [1♀, CNC]; Wakefield, 20.VII.1932, W. J. Brown [2♀, CNC]; Wright, 27.VI.1933, G. S. Walley [1♂, CNC]; Labelle Co., Nominingue, 29.VII.1931, J. Ouellet [3♀, CEUM]; same data, except 6–21.VII.1932 [20♂ 13♀, CEUM]; same data, except 4.VII.1933 [2♂ 1♀, CEUM]; same data, except 2.VII.1934 [1♂, CEUM]; same data, except 8.VII.1935 [1♂, CEUM]; same data, except 22.VII.1936 [2♀, MSUC]; same data, except 2.VIII.1936 [1♂, CEUM].
Host plants
No plant association records were available from specimens examined. Pachybrachis hepaticus hepaticus may be a polyphagous species, considering the number of plant families listed in Clark et al. (2004)[2]: Asteraceae, Euphorbiaceae, Fabaceae, Juncaceae, Salicaceae, and Tamaricaceae.
Comments
Of all the species here studied, the shortest antennae (Habitus 5) and smallest eyes are found in Pachybrachis hepaticus hepaticus. Further investigation may require that a new genus is established for the eastern and western subspecies of Pachybrachis hepaticus. Fall (1915)[3] cited specimens from Montréal, May 24 (Liebeck Coll.); Toronto (Crew); and Scotia Junction, July 27 (Wenzel), but these specimens could not be located and examined.
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.
- ↑ 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.
- ↑ Fall H (1915) A revision of the North American species of Pachybrachys. Transactions of the American Entomological Society 41: 291-486.
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