Morphological observations of ampullae of lorenzini in Squatina guggenheim and S. occulta (Chondrichthyes, Elasmobranchii, Squatinidae) - Schäfer, Bárbara Tavares; Malavasi, Carlos Eduardo; Favaron, Phelipe Oliveira; Ambrósio, Carlos Eduardo; Miglino, Maria Angélica; Amorim, Alberto Ferreira de; Rici, Rose Eli Grassi (Microscopy Research and Technique, 2012)