Genus Micrillus RAFFRAY, 1873

The monophyly of Micrillus is constituted above all by conspicuous synaporphies: abdominal sternite IX and tergite X of strongly reduced size; postero-lateral processes ("valvulae") of segment IX very long, circular in cross-section, and without apical spine (Figs 29, 38). The maxillary palpomere IV is slender and at least approximately half as long as the maxillary palpomere III. Including the newly described species and the two species transferred to Micrillus in this paper, the genus currently includes 28 species in five species groups, two of them newly established. It appears likely, however, that at least part of the unrevised species still in Scymbalium (see catalogue in ASSING 2013) belong to Micrillus, too.