Antennaeantennae:
paired, segmental appendages, borne one on each side of head, functioning as sense organs and bearing a large number of sensilla.
10-segmented with a distinct, 1-segmented club. Antennal setation sparse. Subantennal groovessubantennal groove:
groove or concavity lying below the antennal insertion and housing the base of the antenna. Placed between the eye (if present) and the mandibular articulation, and sometimes extends below or behind the eye.
absent. Eyes small, round to reniformreniform:
kidney-shaped.
, finely faceted. Pronotal discpronotal disc:
the area of the pronotum which is visible dorsally and usually delimited laterally by the two lateral carinae. Contrasted with the paired pronotal hypomera, which extend onto the ventral surface.
simple, pronotumpronotum:
dorsal portion of the pronotum, lying above the lateral pronotal carinae when these are present.
longer than wide, widest anteriorly, lateral margins weakly serrateserrate:
sawlike, i.e., with notched edges like the teeth of a saw.
. Procoxal cavitiesprocoxal cavities:
external closure: Externally closed when the postcoxal processes of the hypomera meet the prosternal process or meet one another.
narrowly open. Metacoxaemetacoxae:
the coxae of the metathorax.
narrowly separated, separation less than metacoxal length. Elytral with 9 rows of evenly spaced, round puncturespuncture:
a small impression on the cuticle, like that made by a needle.
. Tarsal formulatarsal formula:
the number of tarsomeres on the fore, mid, and hind tarsi, respectively.
4–4–4 with first tarsomeretarsomere:
one of the divisions of the tarsus.
dilated and encompassing small 2nd and 3rd segments. Dorsal surface glabrousglabrous:
without hairs (setae).
. Elytraelytron:
the fore wing in Coleoptera, which is more or less uniformly sclerotized and in resting position is longitudinally oriented, usually meeting the opposite elytron along the midline.
pale with a number of small, dark spots. Dorsum with small, curved, pale setaeseta:
a sclerotized, hairlike (or scalelike) projection of cuticula arising from a single trichogen cell and surrounded at the base by a small cuticular ring.
. Body usually encrusted with a pale, waxy exudate.
The genus Monoedus is extremely distinctive and is not readily confused with other zopherid genera.
Monoedus guttatus Horn, 1882
Southeastern (Southern FL, Florida Keys) USA.
Monoedus guttatus can be found on milkweed (Cynanchum scoparium) (Ivie 2002aIvie 2002a:
Ivie, M.A. 2002a. 127. Colydiidae, pp. 445-453 In: R. H. Arnett, Jr., Jr. and M. C. Thomas (eds.), American Beetles. CRC Press, Gainesville, Florida.).
Abundance: Locally not rare.
This genus is also found in Central and South America and the West Indies. It has likely been introduced into the United States.
Members of this genus are frequently encrusted with a pale, waxy exudate that may conceal many of the important features used for identification.
Horn (1882)Horn (1882):
Horn, G.H. 1882. Notes on some little known genera and species of Coleoptera. Transactions of the American Entomological Society, 10: 113-126., Ivie (2002a)Ivie (2002a):
Ivie, M.A. 2002a. 127. Colydiidae, pp. 445-453 In: R. H. Arnett, Jr., Jr. and M. C. Thomas (eds.), American Beetles. CRC Press, Gainesville, Florida., LeConte and Horn (1883)LeConte and Horn (1883):
LeConte, J.L., and G.H. Horn. 1883. Classification of the Coleoptera of North America. Smithsonian Miscellaneous Collections, 26: i-xxxvii + 1-567., Stephan (1989)Stephan (1989):
Stephan, K.H. 1989. The Bothrideridae and Colydiidae of America north of Mexico (Coleoptera: Clavicornia and Heteromera). Occasional Papers of the Florida State Collection of Arthropods, 6: xii + 65 pp.
Authors: Lord NP, Nearns EH, Miller KB. 2011–2015.
Content updated Apr 2015; taxonomy updated Feb 2026
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