used to be pseudotropheus kennyi I think - then became pseudotropheus lombardoi, then metriaclima.
Metriaclima vs. Maylandia is a hot topic around cichlid authors.. it depends on who you read... Ad Konings seems to be most popular so we all use Metriaclima up here, Stuart Grant uses Metriaclima, so does African Diving in Tanzania... so if the big names are using it we assume it's correct.
it's the same as F1 vs G1... we use G1, everyone else uses F1.. it's the same thing (not technically, but oh well)
there was some debate on the connix site, or the gas station about these 2 topics. it wouldnt be hard to find. it might even be on the MCHP or cichlids.com