Rabdophaga rosaria
Member of
willow gall midges (genus Rabdophaga)
gall midges (subfamily Cecidomyiinae)
nematoceran flies (suborder Nematocera)
flies (order Diptera)
insects (class Insecta)
hexapods (subphylum Hexapoda)
willow galls
arthropods (phylum Arthropoda)
animals (kingdom Animalia)
galls
Chris’s observations: none
Not all sites agree about the scientific name:
Bay Area species: iNaturalist