I am looking for taxonomic keys to identify some of southern Africa's earthworms to genus or species level. If there is anyone with information on how to access these keys or an easy way to distinguish them, please let me know.
You may ask Patricks Otomo lecturer at the Department of Zoology and Entomology, University of the Free State, South Africa. The other person may help you is Csaba Csuzdi from Hungry. You will find both these experts of earthworms on ResearchGate.
For Southern Africa Danuta Plisko have published keys for several SA native genera. For Central African Eudrilidae you can find a genus level key (not quite up-to-date but still useful) in Sims (1987) and for dichogastrids in my book of 2010.
Is that book of 2010 entitled: A monograph of the Paleotropical Benhamiinae earthworms (Annelida: Oligochaeta, Acanthodrilidae)? if this is the one Csaba means, it would easily be accessible in the ResearchGate page of Csaba.
The last couple of years also Thembeka C. Nxele contributed a lot on South African earthworms. I have some papers by her. https://www.researchgate.net/profile/Thembeka_Nxele