Collagen fibers were concentrated in regions that were regularly exposed to stress, as elastic fibers showed a broad distribution in all anatomical segments. Thus, considering the wide structural variability of the teleostean OFT, the present study focuses on identifying glycosaminoglycans types and describing the distribution of collagen, elastic and reticular fibers in the conus arteriosus, conal valves, and bulbus arteriosus of A. A previous study in the heart of the Amazonian species Arapaima gigas reported an unusual OFT arrangement among teleosts that has been found only in members of Osteoglossiformes so far. The role of these anatomical components includes structural connections, prevention of blood backflow and blood pressure control, which are related to their histological and histochemical compositions. The cardiac outflow tract (OFT) in teleosts is composed of a proximal short conus arteriosus and a distal well-developed bulbus arteriosus located between the ventricle and ventral aorta.
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