I've found 15 so far, along with information on breeding them. The species I've found are:

Dotsan
Vitales
Sparkes
Susilo
Tuffli
Mccarry
Stahl
Thompson
Henry
Nix
Stacy
Howe
Ricossa
Cavallaro
Griffis


Screenshot of them sleeping in my bank:
http://i1018.photobucket.com/albums/...5_tribbles.jpg