Usually means: Small tropical freshwater killifish species.
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We found 6 dictionaries that define the word genus rivulus:

General (6 matching dictionaries)
  1. genus Rivulus: Vocabulary.com
  2. genus rivulus: Dictionary.com
  3. genus rivulus: Rhymezone
  4. genus rivulus: FreeDictionary.org
  5. genus rivulus: Mnemonic Dictionary
  6. genus Rivulus: TheFreeDictionary.com

Definitions from WordNet (genus rivulus)

noun:  killifish


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