Palaemon elegans sometimes known by the common name
rockpool shrimp, is a species of shrimp of the family Palaemonidae. It is native to the eastern North Atlantic (including Macaronesia), the Baltic, the Mediterranean and the Black Sea, and introduced in the Caspian and Aral seas. It is similar to three other members of the genus
Palaemon:
Palaemon serratus,
Palaemon longirostris and
Palaemon adspersus, and has displaced or replaced populations of
(Wikipedia)