Hyperomyzus (Neonasonovia) Hille Ris Lambers
This group of aphids is very interesting to me, partly because it seems more diverse than is recognized, and partly because the species are next to impossible to recognize based on the existing literature. For 20+ years I have been collecting Neonasonovia and filing them all without species names.
A recent flurry of work at the microscope let me place some tentative names on things, but much more work is needed. The species I have collected are associated with Ribes and various Asteraceae. This is one area of my research where better plant taxonomy might be valuable, getting species identifications on the Ribes, Hieracium, and other host plants.
One species that I studied extensively in the field seems to live throughout the year on Ribes aureum, quite probably with a facultative migration to Crepis and related plants. I have many photos of this one.