ETIOLOGY OF PARATRYGONIC DISEASE. ANATOMICAL, HISTOLOGICAL AND FUNCTIONAL STUDY OF THE AGGRESSIVE ORGAN OF THE FRESH WATER AMERICAN RAY (GEN. &quot;POTAMOTRYGON&quot;)
ETIOLOG'IA DE LA ENFERMEDAD PARATRYGONICA. ESTUDIO ANAT'OMICO, HISTOL'OGICO Y FUNCIONAL DEL APARATO AGRESOR DE LA RAYS FLUVIAL AMERICANA (GEN. &quot;POTAMOTRYGON&quot;)