Ironclad ID: Tool for Diagnosing Ironclad and Cylindrical Bark Beetles (Coleoptera: Zopheridae) of North America north of Mexico
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Genus: Endeitoma

Diagnostic Features
  • Description: Antennae 10-segmented with a distinct, 1-segmented club. Antennal setation sparse. Subantennal grooves absent. Eyes large, well-developed, finely faceted. Antennal segment 3 distinctly elongate (at least twice as long as 4) Pronotal disc convex, simple. Lateral pronotal margins widest at middle, distinctly denticulate. Procoxal cavities open. Metacoxae narrowly separated, separation less than metacoxal length. Tarsal formula 4-4-4. Dorsal surface consisting of thin, fine, hair-like setae.
  • Similar genera: The genus Endeitoma is similar in general appearance to the other genera with 10-segmented antennae and a 1-segmented club that lack a subantennal groove, including Microsicus, Synchita, and Paha. Microsicus differs in antennal segment 3 not distinctly elongate, dorsal surface with strongly curved, flattened, multi-colored elytral setae. The genus Synchita differs in antennal segment 3 not distinctly elongate and the dorsal surface with short, bristle-like setae. Paha differs in antennal segment 3 not distinctly elongate, pronotal disc with two parallel, longitudinal carinae, the lateral margins widest anteriorly and distinctly explanate, and the dorsal pubescence is minute or lacking. In Endeitoma, the third antennal segment is distinctly elongate (at least twice as long as segment 4), the lateral pronotal margins are distinctly denticulate, and a dorsal pubescence consists of thin, fine, hair-like setae.
Known Distribution
  • Northeast (DE, MD, PA, WV), North Central (IN, MO), Southeast (AL, FL, GA, MS, NC), South Central (OK, TX) USA.
  • Endeitoma has been collected from under the bark of dead hardwoods and pines.

  • Abundance: Moderately common.
North American Species (2)

Endeitoma granulata (Say, 1826)
Endeitoma granulata (Say, 1826) [covered in waxy exudate]
Endeitoma dentata (Horn, 1885)
Endeitoma dentata (Horn, 1885) [covered in waxy exudate]

Species Diagnoses
  • Endeitoma granulata: Pronotal lateral margin weakly explanate and moderately translucent, appearing bi-colored. Length of antennal club shorter than diameter of eye. Distribution: Delaware, Indiana, Maryland, Pennsylvania, Alabama, Florida, Georgia, Mississippi, North Carolina, West Virginia, Oklahoma, Texas, Missouri, USA.

  • Endeitoma dentata: Pronotal lateral margin not explanate, unicolored. Length of antennal club equal to or longer than diameter of eye. Distribution: Mississippi, Florida, Georgia, Oklahoma, USA.
Selected References  

Endeitoma granulata
© N.P. Lord

© 2011-2015 Lord, N.P., Nearns, E.H., and K.B. Miller
The University of New Mexico and Center for Plant Health Science and Technology, USDA, APHIS, PPQ.