Genus
Omus
8 species
*Omus* is a small genus of five robust, flightless tiger beetles prowling the forests and open grounds of the Pacific Northwest. Unlike most of their dazzling relatives, these beetles are matte black and strictly nocturnal, hunting by night across compacted soils, sand, and gravel. Their fused elytra make flight impossible, yet *Omus* remains among the most distinctive predators in North American Cicindelidae. Larvae develop in vertical burrows excavated into the soil.
Diagnosis
DIAGNOSIS — *Omus* Eschscholtz, 1829 Body 14–21 mm, robust, elongate-oval. Dorsum entirely matte black to dark brown, lacking metallic iridescence; one species (*O. submetallicus*) with faint metallic sheen. Wings absent; elytra fused along suture. Head broad, wider than pronotum; eyes moderate, not strongly protuberant. Labrum transverse. Pronotum shape variable (rounded to trapezoidal). Nocturnal. Nearctic: Pacific Northwest. Separated from other apterous Manticorini by combination of matte coloration, moderate eyes, and Pacific Northwest distribution.
Etymology
From Greek *ōmós* (raw, savage) — referring to the predatory nature; coined by Eschscholtz 1829.
Species (8)
Distribution map — GBIF occurrences
GBIF · © OpenStreetMap · © CartoDB
Overview
*Omus* is a small genus of five robust, flightless tiger beetles prowling the forests and open grounds of the Pacific Northwest. Unlike most of their dazzling relatives, these beetles are matte black and strictly nocturnal, hunting by night across compacted soils, sand, and gravel. Their fused elytra make flight impossible, yet *Omus* remains among the most distinctive predators in North American Cicindelidae. Larvae develop in vertical burrows excavated into the soil.
Type species: Cicindela californica Eschscholtz, 1829 [by subsequent designation (Dejean 1831)]
1. Wiesner, J. (2020) — checklist authority 2. Pearson, D.L., Knisley, C.B., Duran, D.P. & Kazilek, C.J. (2015) — Field Guide USA & Canada, 2nd ed. 3. Pearson, D.L. & Vogler, A.P. (2001) — Manticorini phylogenetic context 4. LaBonte, J.R. (2011) — Omus revisionary work (verify citation) 5. Knisley, C.B., Kippenhan, M.G. & Brzoska, D. (2014) — Conservation status of United States tiger beetles. Terrestrial Arthropod Reviews 7(2-4): 93-145. 6. Bousquet, Y. (2012) — Catalogue of Geadephaga (Coleoptera, Adephaga) of America, north of Mexico. ZooKeys 245: 1-1722. DOI: 10.3897/zookeys.245.3416 [comprehensive Nearctic catalogue including Cicindelidae] 7. Duran, D.P. & Gough, H.M. (2020) — Validation of tiger beetles as distinct family (Cicindelidae) and reclassification within Coleoptera. Systematic Entomology 45(4): 723-729. DOI: 10.1111/syen.12440 [validates Cicindelidae as separate family] 8. Gough, H.M., Duran, D.P., Kawahara, A.Y. & Toussaint, E.F.A. (2018) — A comprehensive molecular phylogeny of tiger beetles (Coleoptera, Carabidae, Cicindelinae). Systematic Entomology 43(3): 567-586. DOI: 10.1111/syen.12324 [ML phylogeny of 328 taxa, 9 gene regions] 9. Wiesner, J. (2020) — Checklist of the Tiger Beetles of the World, 2nd edition (Verzeichnis der Sandlaufkäfer der Welt, 27. Beitrag zur Kenntnis der Cicindelidae). Winterwork, Borsdorf, 534 pp. [Authoritative current world checklist] +8 citations · full list in paid edition
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