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Genus Pachybrachis - Scriptured Leaf Beetles

Pachybrachis caelatus, dorsal - Pachybrachis caelatus Bark Beetle? - Pachybrachis Pachybrachis Pachybrachis brunneus Bowditch - Pachybrachis brunneus Pachybrachis tridens (F. E. Melsheimer) - Pachybrachis tridens Pachybrachis chester Riley & Barney - Pachybrachis chester - male Pachybrachis turgidicollis Fall - Pachybrachis turgidicollis Beetle - Pachybrachis peccans - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
No Taxon (Series Cucujiformia)
Superfamily Chrysomeloidea (Long-horned and Leaf Beetles)
Family Chrysomelidae (Leaf Beetles)
Subfamily Cryptocephalinae (Case-bearing Leaf Beetles)
Tribe Cryptocephalini
Subtribe Pachybrachina
Genus Pachybrachis (Scriptured Leaf Beetles)
Synonyms and other taxonomic changes
Syn: Pachybrachys - see discussion in Fall (1915)(1)
Explanation of Names
Pachybrachis Chevrolat in Dejean 1836
Numbers
>150 spp. in our area, (17 spp. in e. Can. (2)), ~200 in the New World (all in the nominate subgenus), ~360 spp. in 2 subgenera worldwide (the second subgenus contains a handful of spp. restricted to w. Mediterranean) (3)(4)
Size
2-6 mm
Identification
Small, subcylindrical; pronotum margined at base, w/o lateral grooves for antennae; profemora thicker than metafemora; claws simple (5); most species are difficult to separate without dissection (3)
Range
throughout N. Amer. but much more diverse in the south and the drier western/southwestern areas (3), 17 spp. in e. Canada (2)
largely holarctic, with some representation to the south (4)
Food
foliage of a variety of plants, including trees such as hickory, willow; adults also reported to eat pollen
Life Cycle
Larvae are case-bearing, often gregarious. Pupae are attached to stems and leaves with no cocoons. Typically adults emerge in late summer and overwinter. They disperse in spring or late summer.
Print References
Barney, R.J. 2016a. Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae) endemic to Florida, including descriptions of four new species. The Coleopterists Bulletin 70(1): 31-52.
Barney, R.J. 2016b. Definition and revision of the othonus species-group of North American Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae). The Coleopterists Bulletin 70(3): 569-605.
Barney, R.J. 2017a. Definition and revision of the luridus species-group of North American Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae). The Coleopterists Bulletin 71(1): 1-45.
Barney, R.J. 2017b. Definition and revision of the spumarius species-group of North American Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae). The Coleopterists Bulletin 71(3): 449-460.
Barney, R.J. 2018a. Definition and revision of the atomarius species-group of North American Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae), including descriptions of nine new species. The Coleopterists Bulletin 72(1): 9-74.
Barney, R.J. 2018b. Definition and revision of the pectoralis species-group of eastern North American Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae). The Coleopterists Bulletin 72(3): 471-499. (6)
Barney R, LeSage L, Savard K (2013) Pachybrachis (Coleoptera, Chrysomelidae, Cryptocephalinae) of Eastern Canada. ZooKeys 332: 95–175. (2)
Fall, H.C. 1915. A revision of the North American species of Pachybrachys. Transactions of the American Entomological Society 41: 291–486. (1)
Riley, E.G. and R.J. Barney. 2015. Definition and revision of the viduatus species-group of North American Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae). The Coleopterists Bulletin 69(1): 25–59. (7)
Internet References
Pachybrachis of Texas - Mike Quinn, 2018
Photos of var. spp. - BOLD Systems
Works Cited
1.A revision of the North American species of Pachybrachys
H. C. Fall. 1915. Transactions of the American Entomological Society, Vol. 41, No. 3: 291–486 .
2.Pachybrachis (Coleoptera, Chrysomelidae, Cryptocephalinae) of eastern Canada
Barney et al. 2013. ZooKeys 332: 95–175.
3.American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea
Arnett, R.H., Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.). 2002. CRC Press LLC, Boca Raton, FL.
4.A review of the subgenus Pachybrachis Chevrolat, 1837 s.str. of Palaearctic region (Coleoptera: Chrysomelidae: Cryptocephalinae)
Warchalowski A. 2008. Genus 19: 213-283.
5.A Manual of Common Beetles of Eastern North America
Dillon, Elizabeth S., and Dillon, Lawrence. 1961. Row, Peterson, and Company.
6.Definition and revision of the pectoralis species-group of eastern North American Pachybrachis (Chrysomelidae: Cryptocephalinae)
Barney. 2018. The Coleopterists Bulletin 72(3): 471-499.
7.Definition and revision of the viduatus species-group of North American Pachybrachis Chevrolat (Chrysomelidae: Cryptocephalinae)
Riley, E.G. and R.J. Barney. 2015. The Coleopterists Bulletin 69(1): 25–59.