Brachiacantha steineri is a species of beetle of the family Coccinellidae. It is found in Ecuador.
Description Based on the holotype, a female, adults reach a length of about . They have a black body and yellow head. The pronotum has a black marking. The lateral border of the elytron is yellow and there are two yellow vittae.
Etymology The species is named in honour of the collector, Warren Steiner, a coleopterist at the Smithsonian Institution's Department of Entomology.
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