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Genus Orthosoma

Longhorn Beetle - Orthosoma brunneum Brown Prionid - Orthosoma brunneum Brown Prionid - Orthosoma brunneum Brown Prionid - Orthosoma brunneum Brown Prionid - Orthosoma brunneum Maybe a Giant Root Borer? - Orthosoma brunneum Brown Prionid - Orthosoma brunneum brown prionid (Orthosoma brunneum) - Orthosoma brunneum
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Longhorn, Leaf and Snout Beetles)
Superfamily Chrysomeloidea (Long-horned and Leaf Beetles)
Family Cerambycidae (Longhorned Beetles)
Subfamily Prioninae
Tribe Prionini
Genus Orthosoma
Numbers
Nearctica.com lists one North American species.
Identification
Eleven fimbriate antennomeres (antenna segments). Similar to Derobrachus, but can be differentiated as follows;
Antennomere 3 distinctly longer than 1 and 2 combined, about as long as 4 and 5 together (left) ......... Derobrachus
Antennomere 3 equal in length to 1 and 2, shorter than 4 and 5 (right) ............................. Orthosoma

(Note: Antennomere (Antenna segment) 2 is greatly reduced in both)
Remarks
Bad links in ID section to Cerambycids of Florida replaced with internal BugGuide links to genera 7/19/08 (P. Coin).
Print References
1996. Chemsak, A.J. Illustrated Revision of the Cerambycidae of North America. Vol. I, Subfamilies Parandrinae, Spondylidinae, Aseminae, Prioninae. Wolfsgarden Press, Burbank, ix+150pp., 10 pls.