Source evidence class
2018 IUCN formal assessment versus 2025 NGO first-person observation
Detailed claim and data boundaries
IUCN 2018 classified C. dennerli Critically Endangered (Possibly Extinct in the Wild) after non-detection in 2017/2018. TARSIUS team's August 2025 field report detected the species at 12 of 24 Lake Matano survey stations; 2026 April repeat covered 23 stations, but the website excerpt gives no repeat detection numerator. This is a field report of rediscovery, NOT a published IUCN recategorization or recovery proof.
Interpretation rule
Do not promote habitat sample sizes, species survey detections or older projected IUCN declines into controlled captive breeding outcomes. Use the primary source and its publication/assessment date.
Original sources
- IUCN 2018 Cardinal shrimp C. dennerli assessment
Red List original CR possibly extinct in wild based on 2017/18 nondetections; Snapshot assessment based on historical surveys; superseded for detection by more recent NGO report but not formally recategorized here
- TARSIUS Indonesia Lake Matano surveys August 2025 and April 2026
First-person conservation field report: C. dennerli encountered at 12/24 sites Aug 2025; 23 survey sites Apr 2026; Non-peer-reviewed conservation field post; 12/24 is occupancy detections not shrimp abundance, and second survey does not publish matching species-specific count