Thistle Tortoise Beetle Cassida rubiginosa (Müller, O.F., 1776)
Cassida rubiginosa (often known as the Green Tortoise Beetle) is a common leaf beetle on Creeping Thistle and Knapweed throughout Nottinghamshire and is certainly the most likely of all the Cassida species to be found. The body of the adult is totally covered by the extensive elytra and pronutum, helping eliminate all shadows and aid camouflage on the leaf surface. The flat, almost slug-like larva has rows of branched spines along it's outer edge and has the habit of deficating onto it's back. Larva are easily found during June and the adults appear from mid-July onwards and over-winter.
Cassida rubiginosa pupa, photographed at Sherwood Forest CP August 2011
Cassida rubiginosa larva, photographed at Sherwood Forest CP August 2015
Nottinghamshire (VC56) distribution of Cassida rubiginosa
The records for the Nottinghamshire distribution map are currently provided by the following contributors - Richard Rogers. Trevor and Dilys Pendleton. Pauline Bradford. Netherfield Wildlife Group. Nottinghamshire Wildlife Trust. Wil Heeney. Natural England - Invertebrate Site Register 2006. Tim Sexton. Barry Lygo. Peter Kirby (Bentinck Tip & Void Invertebrate survey 2007). Meg Skinner. Allan and Annette Binding (Clumber Park invertebrate records). Charlie Barnes. Richard Davidson. Brian Wetton.

You can contribute your own records to help us gain an accurate status of this species in Nottinghamshire. Send an Excel spreadsheet of your records via the 'contact us' link at the top of the homepage.

Updated January 2024

copyright © Trevor and Dilys Pendleton ( . .
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