In zoology|lang=en terms the difference between balanid and calanid
is that balanid is (zoology) any member of the balanidae while calanid is (zoology) any member of the calanidae.
As nouns the difference between balanid and calanid
is that balanid is (zoology) any member of the balanidae while calanid is (zoology) any member of the calanidae.