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For Insects, Spiders & Their Kin
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undatus species-group

Heteroceridae  - Heterocerus collaris At blacklight: mud loving beetle - Heterocerus mexicanus Heterocerid - Heterocerus mud beetle #4 - Heterocerus mud beetle #5 - Heterocerus Heterocerus texanus (Pacheco) - Heterocerus texanus Heterocerus texanus Heterocerus - Heterocerus unicus - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga
No Taxon (Series Elateriformia)
Superfamily Dryopoidea
Family Heteroceridae (Variegated Mud-loving Beetles)
Genus Heterocerus
No Taxon undatus species-group
Explanation of Names
includes Pacheco's Dampfius
Numbers
10 spp. in our area [size]:
H. collaris Kiesenwetter 1851 [3.0‒4.2] e.US to IA‒TX
H. inciertus (Pacheco 1964) across Canada & n.-c. US
H. mexicanus Sharp 1882 w.US, TX, LA, IL, QC
H. pallidus Say 1823 [4.5‒6.9] common from New England west to s.AB & e.AZ
H. schwarzi Horn 1890 [3.0‒3.7] from ne US to n TX‒MS; QC‒ON(1)
H. selanderi Pacheco 1969 [2.6‒2.8] FL to extreme s.GA & s.MS
H. subtilis Miller 1988 [3.5‒4] e.NA to MB‒MO
H. tenuis Miller 1988 [3.0‒3.5] so.GA‒FL; ON‒MB(1)
H. texanus (Pacheco 1964) [2.9‒3.5] s.TX‒IA east to NC‒FL
H. undatus Melsheimer 1844 [3.2‒4.5] NS‒AB to VA‒MS‒KS
H. unicus Miller 1988 w.NA to MB‒TX
Identification
medium-sized, more or less reddish with highly variable elytra markings (Miller 1988b)
Works Cited
1.Checklist of beetles (Coleoptera) of Canada and Alaska. Second edition
Bousquet Y., Bouchard P., Davies A.E., Sikes D.S. 2013. ZooKeys 360: 1–402.