Rhacolepis on:
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''Rhacolepis'' is an extinct genus of Maldanis et al. (2016) Heart fossilization is possible and informs the evolution of cardiac outflow tract in vertebrates
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ray-finned fish
Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fins made of webbings of sk ...
from the Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...
Santana Formation of Brazil. Complete fossilised heart
The heart is a muscular Organ (biology), organ found in humans and other animals. This organ pumps blood through the blood vessels. The heart and blood vessels together make the circulatory system. The pumped blood carries oxygen and nutrie ...
s from this species have been recovered./ref>
References
Pachyrhizodontidae Prehistoric ray-finned fish genera Cretaceous bony fish Prehistoric fish of South America Cretaceous Brazil Fossils of Brazil Romualdo Formation Fossil taxa described in 1841 Taxa named by Louis Agassiz Early Cretaceous fish of South America {{Crossognathiformes-stub