Aequorea victoria
Lancelets naturally express green fluorescent proteins (GFP) inside their oral tentacles and near the eye spot. Depending on the species, it can also be expressed in the tail and gonads, though this is only reported in the Asymmetron genus. Multiple fluorescent protein genes have been recorded in lancelet species throughout the world. "Branchiostoma floridae" alone has 16 GFP-encoding genes. However, the GFP produced by lancelets is more similar to GFP produced by copepods than jellyfish ("Aequorea victoria").