Michael Schmitt, Gabriele Uhl. 2017.
Oulema septentrionis and O. erichsonii are neither conspecific nor melanic variants of O. melanopus as assessed by micro CT analysis of their lectotypes (Insecta, Coleoptera, Chrysomelidae, Criocerinae).
In: Chaboo CS, Schmitt M (Eds): Research on Chrysomelidae 7. ZooKeys, 2017, 720: 121-130.
https://doi.org/10.3897/zookeys.720.19760
http://zoobank.org/3969B878-B14C-4886-81E9-D471DDB50D9B