Thistle Tortoise Beetle
by
Shop
Cassida rubiginosa
Fairly common & widespread in England & Wales.
The Thistle Tortioise Beetles measure 6.0–8.0 mm in length.
Like all Cassida, its head is covered by the pronotum, and the elytra has a wide flange surrounding it.
This species is highly rounded, with green or yellowish-green elytra, sometimes with a small, dark triangular spot around the scutellum.
The common name may be misleading for the identification of this species as rubiginosus, which is Latin for "rusty or rust-coloured".
However, in preserved conditions, the green color quickly becomes brown.