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Genus Acoma

Scarab 3 - Acoma mixta Scarab 3 - Acoma mixta - male Acoma diminiata Howden - Acoma diminiata Acoma diminiata Howden - Acoma diminiata - male Acoma brunnea Casey - Acoma brunnea - male Acoma knulli Howden - Acoma knulli - male Acoma conjuncta Howden - Acoma conjuncta - male Acoma arizonica - venter of head - Acoma arizonica - male
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)
Superfamily Scarabaeoidea (Scarab, Stag and Bess Beetles)
Family Scarabaeidae (Scarab Beetles)
Subfamily Melolonthinae (May Beetles and Junebugs)
No Taxon (Incertae Sedis Genera)
Genus Acoma
Explanation of Names
Acoma Casey, 1889
9 spp. in our area, 30 spp. total(1)
US spp.: A. arizonica Brown 1929 [AZ-CA], A. brunnea Casey 1889 [TX], A. conjuncta Howden 1962 [TX], A. diminiata Howden, 1958 [NM], A. glabrata Cazier 1953 [sw.AZ-CA, Mexico], A. howdenorum Warner 2011 [AZ], A. knulli Howden 1958 [w.NM-AZ], A. mixta Howden 1958 [AZ], A. rufula Howden, 1958 [AZ]
Other spp. occur in Mexico and do not range into the US.
4-10 mm
key to spp. in(1)
sw. US (w. TX to CA) & Mexico(1)
Appear to have generally limited, allopatric [nonoverlapping geographic areas] distributions - common in species where one or both sexes are flightless. None are evidently commonly collected. According to American Beetles, the females are still unknown, but are assumed to be flightless. Perhaps they're like Pleocoma - the females are significantly larger and usually need to be dug up, maybe they're cold adapted or found in leaf litter or detritus?
Print References
Cazier, M.A. 1953. A review of the scarab genus Acoma (Coleoptera, Scarabaeidae). American Museum Novitates 1624: 1-13. (Full text)
Howden, H.F. 1958. Species of Acoma Casey having a three-segmented antennal club (Coleoptera: Scarabaeidae). Canadian Entomologist 90(7): 377-401.
Howden, H.F. 1962. New species and synonymy in Acoma (Coloptera: Scarabaeidae). Canadian Entomologist 94(11): 1147-1155.
Howden, H.F. 1963. Speculations on some beetles, barriers, and climates during the Pleistocene and Pre-Pleistocene periods in some non-glaciated portions of North America. Systematic Zoology, 12(4): 178-201.