What is "simiolus"

Simiolus is an extinct genus of dendropithecid primates. It was described by M.G. Leakey and R.E. Leakey in 1987, and the type species is S. enjiessi, which existed during the Miocene of Kenya. The species epithet is a phonetic pun on the acronym NGS. A new species, S. andrewsi, also from the middle Miocene of Kenya, was described by Terry Harrison in 2010.