dorsalhornets

Dorsalhornets is a descriptive term used in entomology and field guides for hornet-like wasps that possess a prominent dorsal horn-like projection on the thoracic dorsum. The term is descriptive rather than taxonomic, and it encompasses individuals from several lineages within the family Vespidae. There is no universally recognized genus or species designated as “dorsalhornets.”

Morphology and identification: The defining feature is a raised horn or keel along the upper surface of the mesosoma, most visible from above. Size varies among populations, typically 2 to 3.5 cm in length. Coloration ranges from dark brown to yellow-black patterns common to hornets; the dorsal horn tends to be more pronounced in queens.

Distribution and habitat: Dorsalhornet-like individuals occur in temperate and subtropical regions worldwide wherever hornets are found, including woodlands, hedgerows, and urban areas. They build paper nests by chewing wood fibers, usually suspended from trees, eaves, or man-made structures.

Behavior: They are eusocial insects with a queen, workers, and drones. Nests may house hundreds to thousands of individuals. In temperate zones, colonies are annual; in some tropical populations, they persist year-round.

Ecology and diet: Dorsalhornets are predators, feeding on caterpillars and other insects; adults also take nectar. They contribute to pest control but can become defensive when nests are approached.

Reproduction and life cycle: After overwintering, a mated queen starts a spring nest, laying eggs that develop into workers; later, new queens and males are produced and disperse to mate. Founding colonies reproduce by swarming.

Venom and human interactions: Like other hornets, they can deliver painful stings; multiple stings can pose health risks to allergic individuals. Caution is advised around active nests; professional removal is recommended.