One Of Three,

out of approximately 350,000,

 species of beetle, only three are actually known to bite people, and here is a fourth, the Scorpion Beetle, (Onychocerus albitarsis), it is the only known insect capable of stinging humans, but not with it's fangs or tail the Scorpion Beetle uses its antennae to deliver a painful toxin, feeling threatened it points it's antennae towards the perceived threat, photograph Antonio Sforcin Amaral / Personal Archive,

but there is one other reason this beetle is so special, it is a classic case of convergent evolution, which is the process whereby organisms not closely related (not monophyletic), independently evolve similar traits as a result of having to adapt to similar environments or ecological niches, the beetle was first described in 1859 by English entomologist Francis Polkinghorne Pascoe,

“We here report the first known case of a cerambycid beetle using its antennae to inject a secretion that causes cutaneous and subcutaneous inflammation in humans,” a 2008 study on the toxin delivery mechanism of the scorpion beetle states, “Scanning electron microscopy revealed that the terminal antennal segment of Onychocerus albitarsis has two pores opening into channels leading to the tip through which the secretion is delivered. The delivery system is almost identical to that found in the stinger of a deadly buthid scorpion.” “When it feels threatened, the scorpion beetle directs its antennae in the direction that the threat is coming from. This resembles the behavior of a scorpion and therefore the name: both because of the way it tries to inoculate aggressors and the aspect of its antennae,” Brazilian zoologist Antonio Lucas Sforcin Amaral, from the State University of São Paulo, told G1, what a fascinating little chap, the good news is that so far, scorpion beetles have only been spotted in Peru and Brazil, they are around two centimeters-long and can be recognized by their long antennae and a white, gray, brown and black body, so if you see one, do not threaten it!