Description of Triangulamyxa psittaca sp nov (Myxozoa: Myxosporea), a New Parasite in the Urinary Bladder of Colomesus psittacus (Teleostei) from the Amazon River, with Emphasis on the Ultrastructure of Plasmodial Stages. Acta Protozoologica, 50(4) 2011: 327-338. 331 [Zoological Record Volume 148]