Cercopagis pengoi, or the fishhook waterflea, is a species of planktonic cladoceran crustaceans that is native in the brackish fringes of the Black Sea and the Caspian Sea. In recent decades it has sp
Onychopoda, from Ancient Greek ὄνυχος, meaning "claw", and πούς poús, meaning "foot", are a specialised order of branchiopod crustaceans, belonging to the superorder Cladocera.