Scolichthys greenwayi is a species of freshwater fish of the family Poeciliidae. It is found in flowing waters along the Rio Chixoy and Rio Salinas system in Alta Verapaz, Guatemala.
The species was first described in 1967 by Donn Eric Rosen. It is placed in subfamily Poeciliinae. Its specific epithet refers to James Greenway.[1]
Rosen described Scolichthys greenwayi as having a diffuse and dusky midlateral stripe with a large dark blotch in front of the dorsal fin's origin. Above this stripe, the species has a reticulate pattern, and below it, the side is a brilliant blue with a lead-white lower belly. Dorsal and caudal fins are a bright orange-yellow.[1] It reaches a length of 3.5cm (01.4inches).
Scolichthys greenwayi is a livebearing fish with a gestation period of 28 days, after which it produces ten to thirty young.