Thysochromis ansorgii. There's not much published info out there on these little guys, but they are the most peaceful dwarf cichlid (except for maybe bolivian rams) I've ever found. The best article on them is in Linke & Staeck's Cichlids from West Africa. Heck, it's the only article I've ever seen on them - there are no articles on the web.
Lars has some pictures about 2/3rds down this page:
http://www.lem.net/alf/westafr.htm
For some reason, my netbook (or maybe it's firefox) hates Lar's website these days - takes forever to load.
Except when spawing, these guys are peaceful. Even when spawing in a 33 gallon tank, they live fine with cherry barbs, variatus platys, and a leopard bushfish.
One nice things about these guys is, unlike many dwarf cichlids, they're not shy...at all.
Eric