surrogate organism

https://doi.org/10.1351/goldbook.15079
Test organism, or population that is cultured under laboratory conditions to serve as a substitute in toxicity testing for indigenous organisms, communities, or populations.
Source:
PAC, 2009, 81, 829. (Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 952 [Terms] [Paper]