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Descriptive and functional anatomy of the digital vascular system of the tokay, Gekko gecko

The vascular system of the digits of the tokay is more complex than has hitherto been suspected and has a configuration which suggests it is intimately involved in the process of adhesion. Distinction can be made between lamellae (expanded scales beneath the proximal portion of the digit) and scansors (elaborations of lamellae that contain a large amount of subdermal material and therefore do not technically qualify as scales). Such a distinction is made on anatomical grounds and can be appreciated only if anatomical investigation is carried out. There are no externally obvious features by which lamellae and scansors can be distinguished, except position. Scansors are found beneath hyperextensible phalanges, whereas lamellae are located more proximally and are not subjected to digital hyperextension during locomotion. Whether this distinction can be applied to other pad‐bearing geckos and to anoline lizards remains to be seen.