So....What is this?

[Skitalez]

[Dave Humphries]

My guess would be one of these, looking from the end in the lower right corner

Interesting mix of different colour temperature light sources in yours I suspect.

Cheers,

[Franci]

It looks like a macro shot of an excavated courgette!

[FrankMi]

I'll bite. As it appears to be a larvae at the bottom of a tube, my guess is that it is an insect or worm of some kind.

[easternlight]

I think it is the eye of a cameleon. Am I right?

[Skitalez]

Bravo,Dave! You are very observant!

[Dave Humphries]

Bravo,Dave! You are very observant!

Thanks, you'll note I only succeeded because I'd handled and photographed one - all comes down to experience