Abstract
The presence of cranial retia mirabilia in rays of the genus Mobula is well established. Although previously regarded as consisting exclusively of arteries, the presence of veins has now been established in gross dissections of the rete in the mobulid, Manta birostris. Histological examination of the retia in Manta birostris and Mobula tarapacana confirms the presence of veins. These findings suggest the presence of a counter-current heat-exchanger that warms the brain.
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