Morley’s Final Catalogue: Abundant in all our coast salterns in mid-May; imagines often on flowers of scurvy-grass. In profusion in Hemley saltmarshes among sea-lavender in 1934 (Wir, Mly); Aldeburgh flats in plenty (Ctw, Mly); Southwold during 1891-7 by Crutwell and Barrett (EMM. xxvii, 221) ; Lowestoft (Bd).
Recent Status: This is a common species on Suffolk salt-marshes.
Life Style: This is a double brooded species that can be found from May till September on Suffolk salt-marshes. The larvae feed on Triglochin maritima in the flowers or shoots. The autumn larvae mine down the stem to hibernate. They pupate in the flower heads or on the ground. The species is also reported to feed on Triglochin palustris which is an inland plant of wetlands but this plant is rare in Suffolk and the distribution of G. vectisana in Britain is notably coastal making T. palustris very much a second choice.
Identification:Gynnidomorpha species have a darker central band, a pre-tornal patch, a pre-apical patch extending towards the termen and a slight band on the base of the dorsum that may reach the costa. The markings in the terminal third of the wing usually show a reticulate appearance. All have a very small patch of blackish scales inside the apex of the folds on the wing that run from the apex, centre of termen and tornus. This in common with some Phalonidia, Cochylimorpha and Phtheochroa species. G. vectisana is a smaller species and the markings are more diffuse than others in the genus. It is variable in colour from grey to brown and usually glossy. There is usually a dark suffusion a third of the way from the dorsum along the central band which is quite wide but often fades beyond the suffusion and is then present on the costa. More Info
Determination by Genitalia Examination (gen. det.) Required
Recorded in 7 (12%) of 58 10k Squares. First Recorded in 1891. Last Recorded in 2019. Additional Stats