Neolamprologus brevis = Neolamprologus calliurus???

I just noticed that Fishbase and Eschmeyer lists Neolamprologus
calliurus as a junior synonym of Neolamprologus brevis.

Does anyone have any info on this, um, "surprising" turn of events?

AFAIK calliurus is up to 8 cm long, has a lyre tail, and is a harem
breeder, while brevis is never longer than 5 cm, has a round tail fin,
and forms pairs.
I find it *exceedingly* unlikely that those are one and the same
species - meaning that either the lyretail shell-dweller is not
calliurus, or something is seriously weird here.

So - anyone know what this is about?