Original: The Neotropical pygmy squirrel (Sciurillus pusillus) is a very small tree squirrel, being the only living species in the genus Sciurillus and the subfamily Sciurillinae.
Simplified: Neotropical Pygmy Squirrel, Sciurillus pusillus, is a very small squirrel species from South America. It is the only living member of the genus Sciurillus and the subfamily Sciurillinae.