rivulus

[riv-yuh-luh s]
noun, plural riv·u·lus.
  1. any of several killifishes of the genus Rivulus, native to small streams of tropical America, often kept in aquariums.

Origin of rivulus

< New Latin, Latin: rivulet
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018