How do you sex this species? Can you tell from my picture if it is a male or female?

Looks close to the Peckoltia vittata. Thanks

I bought this pleco, but the shop owner couldn't give me much info on it. He said it was a Hypancistrus and he thinks it might be a King tiger pleco. The pleco seems to be a carnivore as he ignores tablet food but gladly accepts blood worms. He is +- 10cm and seems to be peaceful.

Link to picture