<p>A new species <i>Cambaltica patra</i> sp. nov. is described from the middle Eocene amber of the Kutch Basin, India, based on synchrotron microtomography data. The new species is the second species of the genus <i>Cambaltica</i> described and the first representative of leaf beetles described from the Kutch amber. The new species is one of the smallest known fossil leaf beetles. The body sizes of fossil leaf beetles are discussed, and it is noted that the hypothesis about the small sizes of leaf beetles in the first half of the Eocene of India has received an additional confirmation. This finding indicates the relationship between the faunas of Cambay and Kutch amber, sharing the same genus <i>Cambaltica</i>. The time of existence of taxa of leaf beetles are discussed and it is noted that the minimum time of existence of the genus <i>Cambaltica</i> is at least ten million years based on findings in Cambay and Kutch ambers that are of different geological ages.</p> Graphical abstract <p></p>