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Species Thyanta custator - Red-shouldered Stink Bug

Red-shouldered Stink Bug - Thyanta custator Thyantha - Thyanta custator Thyanta custator (Fabricius) - Thyanta custator Thyanta custator (Fabricius) - Thyanta custator Red-shouldered Stinkbug? - Thyanta custator Thyanta custator? - Thyanta custator Thyanta cursator? - Thyanta custator Stink bug - Thyanta custator
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hemiptera (True Bugs, Cicadas, Hoppers, Aphids and Allies)
Suborder Heteroptera (True Bugs)
Infraorder Pentatomomorpha
Superfamily Pentatomoidea
Family Pentatomidae (Stink Bugs)
Subfamily Pentatominae
Tribe Pentatomini
Genus Thyanta
No Taxon (subgenus Thyanta)
Species custator (Red-shouldered Stink Bug)
Explanation of Names
Thyanta custator (Fabricius 1803)
10-11 mm(1)
highly variable

overwintering forms are often, but not always, brown, e.g.:

Ventral side with small black spots:
across NA (ME-BC to FL-CA to Guatemala) - Map (2)(3)(4)
polyphagous (recorded from dozens of spp. in 14 plant families)(5); minor pest of crops(6)
Life Cycle
There are good biological reasons for keeping T. custator and T. pallidovirens as separate species although they are virtually indistinguishable morphologically. For the longest time, in the older literature, the common Thyanta species (coast-to-coast distribution) was called T. custator. Then Herb Ruckes revised the group and decided that the common species (coast-to-coast) was actually T. pallidovirens, with T. custator limited to Florida. He also divided T. pallidovirens into three sub-species which he called accera (with black spots on the abdomen, mainly midwestern and northern in range), spinosa (with spinose humeral angles, mainly southwestern), and pallidovirens, found on the west coast, which didn't have the ventral spots or the spiny angles. As with any subspecific characters, they tend to breakdown in the areas of transition. Dave Rider then reversed Ruckes and decided that the common coast-to-coast species was T. custator, and would have done away with T. pallidovirens as a synonym except for a study of the chromosomes by Ueshida at U. Berkeley. The California populations have 2n=16, whereas the midwestern population has 2n=14. So I basically follow Rider who kept the species names. If it's from California and doesn't have spines or spots on the abdomen I call it pallidovirens. Everything else is T. custator. (D.B. Thomas's comment)
Works Cited
1.The Pentatomoidea (Hemiptera) of Northeastern North America
J.E. McPherson. 1982. Southern Illinois University Press.
2.Revision of the genus Thyanta Stål, 1862 (Heteroptera: Pentatomidae). II. Central America, North America, and the West Indies
Rider D.A., Chapin J.B. 1992. Journal of the New York Entomological Society 100(1): 42-98.
3.Checklist of the Hemiptera of Canada and Alaska
Maw, H.E.L., R.G. Foottit, K.G.A. Hamilton and G.G.E. Scudder. 2000. NRC Research Press.
4.Global Biodiversity Information Facility (GBIF)
5.Pentatomoidea Host Index
6.Heteroptera of economic importance
Schaefer C.W., Panizzi A.R. (eds). 2000. CRC Press, Boca Raton, FL, 828 pp.