Phalloceros mikrommatos, the Seguro toothcarp, is a species of poeciliid fish native to Brazil.
Phalloceros mikrommatos is found in the Rio João de Tiba drainage in Bahia, Brazil.
The females of this species grow to a total length of , while males remain smaller at . .
The fish live in tropical freshwater; and are benthopelagic.
The fish is named in Latin = mikro-, meaning small; ommatus, having an eye, referring to eye-like (ocellated) lateral spot.