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The occurrence of smooth muscle sphincters around gastric gland tubules in the cardiac stomach of some elasmobranch species is reported for the first time. These “microsphincters” took the form of a twisted torus, approximately 12–16 muscle fibres thick, that could fully constrict the gland tubules. However, their inconsistent positioning does not suggest a role in partitioning the tubules from the...
Photographic identification was used to track the movements of the whitespotted eagle ray Aetobatus narinari around South Caicos, Turks and Caicos Islands. A total of 165 individuals were identified, aided by the computer program I3S Spot. The sex ratio across all study sites in 2015 was not significantly different from 1:1 (χ2 = 2·8, P > 0·05). 33·9% of all individual rays were resighted at least...
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