the solitary wasp
蜾 refers specifically to a type of solitary wasp, a lone insect that builds individual nests rather than living in colonies.
蜾 combines 虫 (insect) with 果, which likely contributes a phonetic element. The character was created to name a specific wasp species.
The insect radical 虫 beside 果 (fruit) suggests a wasp that might be found near fruit or that builds a nest resembling a small fruit. Picture a lone wasp guarding its fruit-shaped nest.
For カ, imagine a solitary wasp buzzing around a car (カ) parked near a fruit tree: the car sound cues カ, and the wasp is drawn to the fruit.