checking water mint for associated species this lunch time i came across this case on the flower head of water mint (Mentha aquatica). it is the case of a case-bearing moth Thiotricha subocellea. this species has been seen on the UEA campus only in 2015 as one adult and now three larval cases. The larvae are inside of the case and feed by emerging slightly from the case and eating the host plant. they will pupate and overwinter before emerging as adults in summer 2016. They are listed as nationally scarce category B.