astacus

(from the Greek , , meaning "lobster" or "crayfish") a genus of crayfish found in Europe, comprising three extant (living) species and three extinct fossil species.

Astacus (Greek ) is an ancient city in Bithynia; it was also called Olbia .

Astacus or Astakos was a town on the west coast of ancient Acarnania, on a bay, one side of which is formed by the promontory anciently named Crithote.