Anomura
a sub-order of decapod crustaceans, intermediate between macrura and brachyura, differing from the former in the absence of an abdominal fan-shaped fin, as also of natatory feet; and from the latter in ger generally possessing appendages attached to the penultimate segment segment of their abdomen. The sub-order is divided into the families paguridæ, hippidæ, raninidæ, homolidx, and dromiidæ. Its best known representatives are the hermit crabs (paguridæ.