To hybridise or not?
We found no evidence of hybridisation between these species, despite finding many F1 hybrids in the past. This suggests some post-zygotic isolation happening in the hybrid zones. These days, that's just about everywhere for X. gilli .
Ben Evans, Ben Furman, Caroline Cauret & John Measey
I was lucky enough to visit Ben's lab in March 2017.
Furman, B., Cauret, C., Colby, G., Measey, J. & Evans, B.J. (2017) Limited genomic consequences of hybridization between two African clawed frogs, Xenopus gilli and X. laevis (Anura: Pipidae). Scientific Reports7(1):1091 pdf