Skiffia multipunctata is a livebearing goodeid from Mexico. Depending on how you count them, there are between 35 and 45 goodeid species. The genus Skiffia comprises of S. francesae, S. lermae and S. multipunctata.
Skiffia multipunctata is a highly variable fish in coloration and spotting. I have seen individuals which were almost totally black and other individuals, such as the Sayula color form above, which are quite yellow-gold. Plus, there are combinations with both black and gold. Compared to many other goodeids (I'm talking about you, Skiffia lermae!), it is very good looking! 
While goodeids are rare in the hobby, Skiffia multipunctata is pretty enough to make it relatively popular as a goodeid.
The Sayula Skiffia multipunctata is a fish in some dispute. This fish was originally collected in 2007 by some British hobbyists who thought it was Skiffiia francesae, which some folks believe is extinct. The American Livebearer Association believes that it is a variant of Skiffia multipunctata.  This fish is occasionally referred to to by a numeric designation of sp 188.
Because of this dispute, it is important for hobbyists to maintain this fish separate from all other Skiffia populations and to use its full name nomenclature: Skiffia c.f. multipunctata "Sayula, Jalisco, Mexico".
Whatever scientists eventually decide, this is a pretty fish.
 
Distribution
 
The type specimen for Skiffia multipunctata is from Guadalajara, Mexico, but the Sayula multipunctata is found 116Km from the type location in Sayula, MX. It may be that Skiffia multipunctata is much more widely distributed than previously thought.  This species is found in quiet ponds and streams, over a variety of substrates, but often associated with plants.
 
Size, Maturity, and Sexual Dimorphism
 
Sexual Dimorphism: Males are more colorful and have an andropodium
 
Sexual Maturity: 2.5 inches
 
Size, Male: 4 inches
 
Size, Female: 4.5 inches