Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
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Fall Fund Drive


undatus species-group

Heteroceridae - Heterocerus collaris Heteroceridae  - Heterocerus collaris H. collaris-like - Heterocerus collaris H. collaris-like - Heterocerus collaris Dampfius mexicanus (Sharp) - Heterocerus mexicanus Dampfius mexicanus (Sharp) - Heterocerus mexicanus Heteroceridae - Heterocerus pallidus Heterocerus texanus (Pacheco) - Heterocerus texanus
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 Elateriformia)
Superfamily Byrrhoidea (Pill, Water and Toe-winged Beetles)
Family Heteroceridae (Variegated Mud-loving Beetles)
Genus Heterocerus
No Taxon undatus species-group
Explanation of Names
includes Pacheco's Dampfius
10 spp. in our area:
H. collaris Kiesenwetter 1851 - east and central US 3.0 - 4.2 mm.25.recorded from every state in the eastern U.S., except Florida. In the Midwest it is known from Iowa, Oklahoma and Texas. Records are especially common between the Ohio and Illinois rivers north of their junction with the Mississippi River
H. inciertus - across Canada, and northcentral US
H. mexicanus Sharp 1882 - western US, TX, LA, IL, and Quebec
H. pallidus Say 1823 4.5 - 6.9 mm.common from New England west to southern Alberta and south to eastern Arizona and the coast of Mississippi. Except for several records from Pennsylvania, it is not known to occur southeast of the Ohio River. A few records from Utah are the only evidence that this species occurs west of the Rocky Mountains.15
H. schwarzi Horn 1890 3.0 - 3.7 mm.from the northeastern United States, southeast through Indiana into northern Texas, Arkansas, northern Louisiana and western Mississippi27 +QC-ON884000
H. selanderi Pacheco 1969 (FL)2.6 - 2.8 mm23.collected primarily in Florida and extreme southern Georgia, although one specimen of H. selanderi has been collected in southern Mississippi 24
H. subtilis Miller 1988 - northern central and east US and Canada
H. tenuis Miller 1988a 3.0 - 3.5 mm28.Florida, southern Georgia [+Rondeau Park, Ontario [interstate commerce] +QC884000
H. texanus (Pacheco) 1964 2.9 - 3.5 mm26.from southern Texas north to Iowa and east to the coast of the Carolinas and south to Florida
H. undatus Melsheimer 1844 - northern central and east US and Canada 3.2 - 4.5 mm25. midwestern and northeastern United States into southeastern Canada, as far south as Missouri and Virginia (Miller 1996). Collection data indicates that H. undatus occurs west into southern Iowa and Kansas, and south into eastern Arkansas and northern Mississippi26
H. unicus Miller 1988b - western US and Canada
medium-sized, more or less reddish with highly variable elytra markings. (Miller 1988b)