The Piranga Tortoise (Chelonoidis carbonaria), as it is popularly known, is a chelon belonging to the Cryptodira suborder that is differentiated mainly by the red or orange color of its scales on the head and limbs. The circulatory system of these animals required morphological adaptations that allowed the transition between terrestrial and aquatic environments. Therefore, studies correlating the cardiac characteristics of Testudines, including the arrangement of the vessels, skeleton and cardiac conduction system, are scarce. Thus, the work aimed to describe and provide information that assists in the theoretical foundation of research on the vascular system of Chelonoidis carbonaria. In this study, 12 specimens of pirang tortoise were used, from the Bosque Rodrigues Alves Botanical Garden - Belém- PA, under SEMA-PA authorization. The animals were thawed in running water until enough to collect the heart. After this procedure, the collected material was fixed in a 10% aqueous solution of formaldehyde, the samples were photodocumented and subjected to standard histological procedures for making the slides. The hearts of the analyzed specimens of C. carbonaria were surrounded by the pericardium, consisting of 3 cavities, 2 atria and 1 ventricle. It was possible to visualize an additional chamber, located in the dorsal region of the right atrium called the venous sinus. The ventricle is subdivided into three subchambers: cavum pulmonale (CP), cavum arteriosum (CA) and cavum venosum (CV). The base of the heart has three large vessels with thick, muscular and skeletal walls, they are: the left aorta, the right aorta and the pulmonary trunk; The base of the aortas has an intraaortic septum formed by cartilage. In a longitudinal histological section, two atria were observed, a single ventricle, together with its cavities, and the muscular crest, which delimits the CP and CV. Both atria and ventricles are formed by three layers: epicardium, myocardium and endocardium, with similar histological characteristics. Furthermore, the presence of cartilaginous cells was observed in the cartilaginous support of the aorticopulmonary septum. Taking into account the aspects studied in line with the literature, it was possible to relate the similarity between the anatomical characteristics of the hearts of different species of the Testudines order, with distinctions, mainly in the arrangement of the vessels, when compared with other species of the reptile class