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Name that pupa! (1 Viewer)

Mis

Well-known member
I found this pupa on a thistle leaf today (SE edge of London). It is flatter than a ladybird pupa and about 7mm long. I say pupa rather than exuvia because it appeared to still have contents but may have been a failure and in the process of drying out. The two dark spots give it the appearance of a bizarre mask!
Can anyone identify it for me please?
 

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I think I've found it. It could be Cassida rubiginosa, the thistle tortoise beetle. I'll have to search the area for adults but it seems they aren't easy to spot.
 
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