Ruiz, Armando, and Mario Alfaro. “Notes on Costa Rican Opalinids. Il. Zelleriella Antillensis ( Metcalf) and Z. Bufoxena Metcalf”. Revista de Biología Tropical 7, no. 2 (December 1, 1959): 219. Accessed May 7, 2024. https://revistas.ucr.ac.cr/index.php/rbt/article/view/29949.