Though these structures have been interpreted differently over the years, in Mosura fentoni, researchers believe they suggest structures of an open circulatory system, according to the museum.

Rather than arteries and veins, Mosura also had an open circulatory system, meaning that its heart pumped blood into lacunae, or large internal body cavities. The cavities were preserved as ...

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These mark blood spaces, or lacunae, part of an ancient open circulatory system. “The well-preserved lacunae of the circulatory system in Mosura help us to interpret similar but less clear features ...