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What do you think? someone knows the way to differenciate them accuracy?

I would say C. Bilineatus. They have three proper horizontal lines whereas C. Elegans has one proper upper line and a lower "smugged" line which is quite wide. Still, that's all in my humble opinion, so hopefully one of the old hands will confirm or deny this

Hi
I'll second that,as i don't think the black runs into the base of the tail as much in Elegans.

Wouldn't put money on it though

cheers
lisa