A new species of Eocene soldier beetle, a <italic>Malthodes</italic> (Coleoptera: Cantharidae: Malthininae) in Baltic amber.

A new species of soldier beetle (Cantharidae) from Eocene Baltic amber, <italic>Malthodes maierae</italic> sp. nov., is described and illustrated from a male specimen discovered in Russia. The new species differs from the hundreds of known extant and extinct species of <italic>Malthodes</italic> Kiesenwetter, 1852. The last abdominal segments, which are substantially modified on the male to hold the female during mating, differ considerably in <italic>Malthodes</italic> species and are very important diagnostic elements for this genus. The exact evolutionary forces driving these manifold modifications are unknown, but they are likely related to sexual selection, mate recognition, antagonistic coevolution, or varying habitats, or a combination of two or more of these factors.The Zoobank LSID for this is: urn:lsid:zoobank.org:pub:DC13FC31-BD71-4C3D-9536-B70AF65FB699 [ABSTRACT FROM AUTHOR]