Difference between revisions of "Pachybrachis cephalicus"
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Latest revision as of 14:39, 19 September 2013
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Ordo: Coleoptera
Familia: Chrysomelidae
Genus: Pachybrachis
Name
Pachybrachis cephalicus Fall, 1915 – Wikispecies link – Pensoft Profile
- Pachybrachys cephalicus Fall, 1915: 419.
- Pachybrachys cephalicus var. Pachybrachis dixianus Fall, 1915: 419.
- Pachybrachys cephalicus var. Pachybrachis parvus Fall, 1915: 419.
Recognition
Pronotum and head generally fuscous, densely punctate and darker than elytra; elytra with puncturation dense and confused (Habitus 4); ocular lines absent; male size small: length 1.94 ± 0.12 mm, width 1.05 ± 0.08 mm.
Distribution
A typical eastern species distributed from Louisiana to New York to Atlantic Coast (Riley et al. 2003[1]), restricted to southern Ontario in eastern Canada (Map 4).
Material examined
ONTARIO: Norfolk Co., Walsingham Forest Station, 28.VII.1982, ex. Potentilla or strawberry, L. LeSage [11♂ 14♀, CNC].
Host plants
Cinquefoil (Potentilla sp.) and strawberry (Fragaria sp.) (both Rosaceae) are the first host associations reported for Pachybrachis cephalicus. The specimens were swept from these two plants growing in a sandy clearing within a dry oak-pine forest (LeSage, personal field notes). Since 1984, the previous Walsingham Forestry Station is part of the St. Williams Dwarf Oak Forest, the largest block of publicly owned forest in the Carolinian Life Zone (NHIC 1998[2]).
Comments
Pachybrachis cephalicus is another of Fall’s (1915)[3] Group C species that have “great variation in the degree of (elytral) maculation.” The fairly large number of examined specimens may be misleading since they all come from only one event. In fact, Pachybrachis cephalicus is very rarely collected in eastern Canada and known from only one locality within the Carolinian Life Zone. This is also a first record of this species for Canada.
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.
- ↑ NHIC ( (1998) St. Williams Dwarf Oak Forest. http://www.carolinian.org/CarolinianSites_stwilliamsdwarfoakforest.htm [accessed 14 March 2012]
- ↑ 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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