Larinus planus

They are oval shaped, dark brown or black, and about 5–10 millimetres (3⁄16–3⁄8 in) long.

It feeds on floral buds, primarily of thistles, with the larvae stage being the most destructive to them.

Once hatched, the larva has a segmented white body with a brown head, and is C-shaped.

[1] Larinus planus prefers dryer ranges, but can also adapt to wetter locations.

tracyi, a sparsely distributed thistle native to western Colorado and eastern Utah.

Subsequent research determined that the weevil reduced seed production of the native thistle.

Canada Thistle Bud Weevils (Subgenus Phyllonomeus) Mating
Canada Thistle Bud Weevils Mating