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subgenus Donacia

Little bug on water lilly pad - Donacia aquatic leaf beetle - Donacia cincticornis - male Donaciinae - Donacia cincticornis Donacia  sp? - Donacia proxima Metallic Beetle - Donacia hypoleuca Aquatic Leaf Beetle - subgenus Donacia - Donacia hypoleuca Donacia? - Donacia proxima Chrysomelidae - Donacia
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga
No Taxon (Series Cucujiformia)
Superfamily Chrysomeloidea (Longhorn and Leaf Beetles)
Family Chrysomelidae (Leaf Beetles)
Subfamily Donaciinae (Aquatic Leaf Beetles)
Genus Donacia
No Taxon subgenus Donacia
Other Common Names
Pond lily leaf beetles (the host of all species of the subgenus)
Numbers
10 spp. in our area(1), ~14 total(2)
Identification
Recognized by combination of: color generally not metallic though the cuticle can have a metallic sheen especially in sunlight, rather like tortoise beetles; pronotum lacking coarse punctures that can form transverse rugae, the surface can be shiny, to distinctly shagreened, median sulcus distinct to obliterated; elytra shiny and impunctate and lack prominent rugosity; metafemora typically distinctly clavate and with 1 or 2 ventrosoical teeth or spines, but range from hardly clavate and lacking teeth to extremely robust and bidentate. (Ingolf Askevold, 2024)
Range
primarily holarctic, with some representation more to the south; in our area, eastern, with 1 sp. ranging to the west coast (BC‒CA)(1)
Habitat
on pond lilies, Nuphar or Nymphaea spp. (Nymphaeaceae)
Food
hosts: Nuphar, Nymphaea(1) (Brasenia is cited as a host but is really just a temporary landing spot. Nymphoides also.)
Works Cited
1.American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea
Arnett, R.H., Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.). 2002. CRC Press LLC, Boca Raton, FL.
2.BioLib.cz