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Triops longicaudatus

Triops longicaudatus

T. longicaudatus is your “garden variety” triops. This is the species that gets sold throughout the world in triops kits. It is the most studied of all the Triops and Lepidurus species and, hence, the one we know the most about.* As mentioned elsewhere, because it is studied more than any other species genetic data suggest that there are probably several if not dozens of subspecies currently lumped together as a single macrospecies.   At the level of gross anatomy, there are two distinct morphs: a long form and a short form which can be distinguished by the number of segments/tail length not coverd by the carapace.

Major species

Triops longicaudatus


none official*


  • North America
    • United States (also in Hawaii but not Alaska)
    • Mexico
  • Central America
  • South America
  • Japan
  • West Indies
  • Galapogos Islands
  • New Caledonia


Temporary waters (a common inhabitant of rice fields in the U.S. and Japan)

Temperature range

Minimum Temp: 18°C (60°F) Maximum Temp: 30°C (86°F)

Body ring/segments

35 – 44, 5 – 12 apodous in females, 10 – 14 apodous in males


54 – 66

Notable characters

Second maxilla is absent


Bisexual (with both male and female biased populations known), unisexual, and hermaphroditic

Life span

Approximately 80-90 days. Usually half this in an Aquarium.

My Triops (July 23, 2024) Triops longicaudatus. Retrieved from
"Triops longicaudatus." My Triops - July 23, 2024,
My Triops July 13, 2020 Triops longicaudatus., viewed July 23, 2024,<>
My Triops - Triops longicaudatus. [Internet]. [Accessed July 23, 2024]. Available from:
"Triops longicaudatus." My Triops - Accessed July 23, 2024.
"Triops longicaudatus." My Triops [Online]. Available: [Accessed: July 23, 2024]
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  • {Living fossil} - Fossil have been found and back to more than 220 million years ago. They are thougt to have been on the planet even longer than that, up to 350 million years
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