Adjectives

(a)caudalconstituting or relating to a tail“caudal appendage”
(s)caudal, taillikeresembling a tail
(s)caudalsituated in or directed toward the part of the body from which the tail arises“caudal fins”, “the caudal end of the body”

Adverbs

(r)caudally, caudaltoward the posterior end of the body