Author: (Miller, 1907)
FBname: Merry widow livebearer
Comments: Occurs mainly in stagnant waters, creeks and river shorelines, over soft bottoms.  On the Atlantic versant it lives between 0 and 500 m of elevation, but in the northern Pacific sector is found between 10 and 45 m in the Tempisque and Bebedero drainages; in the Río Tárcoles drainage, where it was probably introduced, it lives between 670 and 1220 m elevation.  Inhabits shallow waters with mud or litter substrata in temperatures of 20 to 37°C.  Feeds on ooze, detritus, diatoms and occasionally on filamentous algae and aquatic insects (Ref. 36880).