The harlequin beetle (Acrocinus longimanus) is a large and distinctly colored species of longhorn beetle from the Neotropics and the only member of the genus Acrocinus.
It is given its English name because of the elaborate pattern of black, orange-red and greenish-yellow markings in both sexes; despite this the beetle is quite well-camouflaged when perched on a lichen or fungus covered tree trunk. The species name longimanus is a Latin word that refers to the extremely long forelegs (manus) of the large males, which are longer than the beetle's entire body. The head-and-body of this beetle measures 4.3 to 7.5 cm (1.7–3.0 in) long. The size and unusual appearance of the harlequin beetle has made it popular among insect collectors. Although essentially harmless to humans, it may bite in self-defense with its strong mandibles.
Taxonomy
The harlequin beetle was first scientifically described as Cerambyx longimanus by Linnaeus in the 10th edition of Systema Naturae in 1758. In 1806, it was moved to the newly coined genus Acrocinus by Illiger. Although recent authorities have consistently recognized it as the only member of this genus, the relationship to other genera of longhorned beetles has not been clear: It has been disputed whether the tribe Acrocinini only should include the genus Acrocinus or it also include a few other genera. Recent authorities have often considered Acrocinini as monotypic, but an analysis of morphological characters indicates that Macropophora and Oreodera are sufficiently close to also be included in this tribe.
Despite the very large distribution of the harlequin beetle, both morphological and genetic evidence supports its status as a single widespread species rather than a cryptic species complex.
Distribution and habitat
The harlequin beetle is found in tropical and subtropical parts of the Americas, ranging from Mexico, through Central and South America, south as far as northernmost Argentina (Corrientes and Misiones), southernmost Brazil (Rio Grande...
