Genus Cylindroiulus Verhoeff, 1894

Micromastigoiulus Verhoeff, 1899 .

Dendroiulus Verhoeff, 1930 .

Allajulus auct.

Diploiulus auct.

This is a very large genus consisting of over 100 species in Europe ranging from Central Asia to Macaronesia, the majority being in Southern Europe, especially Italy, and on the island of Madeira, which hosts an endemic species swarm (Enghoff 1982, 1983; Reboleira & Enghoff 2014). Several species have spread northwards into much of the rest of Europe while some pioneering and anthropochorous members are becoming widespread globally.