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Species Crossidius discoideus

Beetle - Crossidius discoideus - female Rd&Blk Longhorn - Crossidius discoideus - male Hairy Red Elongate Beetle - Crossidius discoideus Hairy Red Elongate Beetle - Crossidius discoideus Cerambycidae 4 - Crossidius discoideus Cerambycid of sorts.. - Crossidius discoideus Cerambycid of sorts.. - Crossidius discoideus Crossidius discoideus, Male? - Crossidius discoideus - female
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 Cerambycidae (Long-horned Beetles)
Subfamily Cerambycinae
Tribe Trachyderini
Subtribe Trachyderina
Genus Crossidius
Species discoideus (Crossidius discoideus)
Synonyms and other taxonomic changes
Callidium discoidum Say 1824
Numbers
3 subspecies, all in our area(1)(2). Names (with synonyms indented) and links to original descriptions are as follows:
    discoideus (Say) 1824 [Orig. Description]
          pulchrior Bland, 1862 [Orig. Description]
    blandi Casey, 1893   [Orig. Description]
    sayi Casey, 1912 [Orig. Description ]
          sayi bilenticulatus Casey, 1912 [Orig. Description]
          submetallicus Casey, 1912 [Orig. Description]
Identification
Taken together, the remarks Casey included with his 1912 description of C. sayi and 1893 description of C. blandi, indicate the following:
1) Subspecies sayi always has some black maculation on the pronotum...varying from two distinct small and somewhat oblique spots, to larger spots which can become confluent, forming an inverted-"v" shape. The other two subspecies have pronotum entirely red, with no black on the pronotum. 2) Subspecies blandi differs from discoideus in its: smaller size; more narrow form; more sparse punctation (especially the pronotum); and more rounded apex (the apex of discoideus is described as "feebly truncate").
Range
w. N. Amer.(2)
Remarks
Associated with composites in the genera Gutierrezia & Haplopappus; larvae bore in the root crown while adults are found on the flowers and foliage. --T.C. MacRae
Internet References
Curated images of 1) ssp. discoideus; 2) ssp. blandi; and 3) ssp. sayi...from "The Photographic Catalog of the Cerambycidae of the New World"(2).