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Photo#1122444
Fang? - Naupactus cervinus

Fang? - Naupactus cervinus
Santa Cruz, Santa Cruz County, California, USA
August 14, 2015
It looks like a Fuller Rose Beetle, but the fang seems new to me. Are they retractable?

A closer look (see next image) reveals a second, very different, Well, mandible, I guess. It has two large teeth, and maybe some smaller.

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Fang? - Naupactus cervinus Fang? - Naupactus cervinus

those fangs are deciduous and fall off soon after eclosion
...though not always simultaneously
it's an entimine thing

Moved from Snout and Bark Beetles.

 
Interesting...their new ones must be an improvement.
The new one looks more serrated.

 
there are no 'new ones' -- it's a disposable, provisional part
used for eclosion only, then shed

 
Now, that is interesting, and yet...
in photo 2, you can see what appear to be two different types of mandibles. I assumed the one on the passenger side was permanent.

Sorry to belabor the point. I understand, I think. The longer one is used for eclosion only. So when the left side (long dark)mandible falls off, they will both look like the right side one that is visible in photo 2? That's got to be it!

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