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TaxonomyBrowse
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Genus Cucujus

Red Flat Bark Beetle larva - Cucujus clavipes beetle larva - Cucujus clavipes Cucujus clavipes pupa - Cucujus clavipes Red Flat Bark Beetle, dorsal - Cucujus clavipes Cucujus clavipes Cucujus clavipes Is this a Red Flat Bark Beetle (Cucujus clavipes)? If not, can you tell what it is? - Cucujus clavipes Cucujidae: Cucujus clavipes - Cucujus puniceus
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 Cucujoidea (Sap, Bark and Fungus Beetles)
No Taxon (Cucujid series)
Family Cucujidae (Flat Bark Beetles)
Genus Cucujus
Synonyms and other taxonomic changes
all the continental Nearctic & Palaearctic spp. belong to [i] species-group(1)
Explanation of Names
Cucujus Fabricius 1775
Numbers
2 spp. in our area, ~25 total(1)
Size
in our area, 10-14 mm
Identification
the easiest way to tell apart our spp. is the color of the scape, red in C. puniceus vs black in C. clavipes

[specimens with black scape are known from Alaska(2)]
the larvae can be distinguished by the ratio of the 8th abdominal segment length vs length of the forked process (4:3 in C. puniceus vs 1:1 in C. clavipes, and the ratio of the 8th abdominal segment width vs the width of forked process (measured at tips) (5:3 in C. puniceus vs 3:2 in C. clavipes)(2)
compare
see also Fig.1 in (1) for other diagnostic features
Range
Holarctic & Oriental, by far most diverse in E/SE Asia(1); in our area, C. puniceus is western and C. clavipes eastern, with some overlap just east of the Rockies
Habitat
under bark of dead trees/logs(1)
Works Cited
1.Disentangling phylogenetic relations and biogeographic history within the Cucujus haematodes species group (Col.: Cucujidae)
Kadej M, Zając K, Gutowski JM, Jaworski T, Plewa R, Ruta R, Sikora K, Smolis A, Magoga G, Montagna M, Eckelt A, Birkemoe T, ... 2022. Mol. Phylog. Evol. 173 107527.
2.Clarification of the taxonomic status of Cucujus clavipes with descriptions of the larvae of C.c. clavipes and C.c. puniceus...
Lee J., Thomas M.C. 2011. Fla. Entomol. 94: 145-150.