Neotropical Monogenoidea. 30. Ancyrocephalinae (Dactylogyridae) of piranha and their relatives (Teleostei, Serrasalmidae) from Brazil: species of Calpidothecium gen. n., Calpidothecioides gen. n., Odothecium gen. n., and Notothecioides gen. n. Journal of the Helminthological Society of Washington, 64(2), July 1997: 208-218. 209 [Zoological Record Volume 134]