Author: Schartl, Meyer & Wilde, 2006
FBname: Sapphire toothcarp
Comments: Collected from a small brook, about 0.5 to 1 m wide, that flows into a tributary to the río Tacotalpa, close to a bridge, a few hundred meters on an unpaved road that branches off into northeasterly direction from the main road from Tapijulapa to Jamapa between the small settlements of Zunu y Patastal and Madrigal (Cuarta sección).  At the time of collection, at late afternoon the water had a temperature of 26 °C, a conductivity of 360 mS, pH 8.0, and total hardness of 10-15.  The water was crystal clear and fast flowing with no aquatic vegetation.  The substratum consisted mainly of gravel and sand. The brook flows in a deep indentation and is fully shadowed by the vegetation.  Associated poeciliid fishes were <i>Pseudoxiphophorus bimaculatus</i>, <i>Gambusia</i> sp., <i>Heterophallus milleri</i>, <i>Poecilia mexicana </i> and a characid, <i>Astyanax mexicanus</i> (Ref. 57748).