The word "Heleny" does not have a direct translation as it appears to be a proper noun, likely a name. If you need further context or a specific translation related to "Heleny," please provide more details!

Clea Helena is an interesting species of ornamental snail that is very popular among aquarists. It is mainly used as a protection against the overpopulation of other snail species, primarily attacking smaller types while ignoring larger ones. Personal pickup in Plzeň is required, but delivery in the Plzeň region can be arranged by agreement.