Opsidos

Opsidos refers to a group of beetles belonging to the family Oedemeridae. These beetles are commonly known as false blister beetles or pollen-feeding beetles. They are characterized by their elongated, somewhat soft bodies and often vibrantly colored elytra, which can range from metallic green and blue to red and yellow. The antennae are typically filiform, and the legs are slender.

Oedemeridae are found worldwide, with the greatest diversity in tropical and subtropical regions. Many species are associated with decaying wood, where their larvae develop. The adult beetles are often observed on flowers, feeding on pollen and nectar. This feeding behavior has earned them the common name "pollen-feeding beetles." Some species are also attracted to sap exudates.

While the name "false blister beetle" suggests a similarity to blister beetles (family Meloidae), Oedemeridae do not produce the same potent blistering agent, cantharidin. However, some species may contain milder irritants. Their ecological role includes pollination and serving as a food source for other animals. Their presence can be indicative of suitable habitat, particularly for their larval stages within decaying organic matter.