Gypsonoma Meyrick
Type species: dealbana Frölich = incarnana Haworth
DIAGNOSIS
External characters:
Venation:
venation Gypsonoma incarnana
Forewing: Chorda weak, extending from 1/3 R 1-R 2 to before base of R 5; M -stem to base of M 2; two last median in close proximity basally. In hindwing M3-CuA 1 connate or short stalked.
Hindwing: M 3 and CuA 1 connate or short stalked.
Forewing shape and markings:
examples of Gypsonoma spp.
Forewing without costal fold; markings variable.
Genitalia:
Male:
male genitalia G. aceriana ; male genitalia G. minutana
Uncus absent; socius broad, hairy, situated laterally. Basal cavity of valva short, or elongate, covered by minutely haired membrane in the posterior part, or with scent scales, with posterior edge simple, convex or with clasper or a lobe; ventral margin of valva usually without large notch; cucullus rounded apically, setose; terminal margin spined or glabrous. Aedeagus simple, with deciduous cornuti.
Female:
female genitalia G. aceriana ; female genitalia G. minutana
Sterigma ring-shaped or expanding laterally; cingulum large, irregularly sclerotized, usually postmedian; corpus bursae with two slender signa.
Early stages:
Swatschek, 1958, provides the following diagnosis for the larvae based on chaetotaxy.
Crochets on abdominal prolegs of variable length, or crochets biordinal. If uniordinal, then SV group bisetose on first and second abdominal segment. Setae L1 and L2 set in a vertical line on first abdominal segment (except in nitidulana).
Biology:
There is a single generation yearly; hibernation takes place in the larval or pupal stages. Larvae feed in buds, leaves and twigs, mainly of Salicaceae and Betulaceae.
Distribution:
Palaearctic and Nearctic Regions.