Abstract
The microstructure of the scale surface was analysed in five species of the genus Lebias, Goldfuss by scanning electron microscopy. The morphology, the disposition and type of attachment of the lepidonts on the crest of the circuli, found at the anterior portion of the scales, allowed us to identify a high affinity between L. dispar and L. sirhani and a pronounced morphological gradient from L. fasciata to L. iberus and L. apoda, with the latter being well differentiated with respect to the others. The results agree with morphological data that are already known for the five species examined.
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