RUIZ, A. Notes on Costa Rican Opalinids. I. Opalina moreletei Metcalf. Revista de Biología Tropical, [S. l.], v. 7, n. 2, p. 217, 1959. DOI: 10.15517/rev.biol.trop.1959.29948. Disponível em: https://www.revistas.ucr.ac.cr/index.php/rbt/article/view/29948. Acesso em: 12 may. 2025.