There is a sapient jellyfish species resembledresembling the box jellyfish found to be lurking in the ocean today, a. A team of researchers took a sub and dived into the abyss to look for it. What kind of non-invasive tests (in-situ) can be performed on this jellyfish to see if it is sapient? Don't expect it to talk back or open a jar! However incomplete fossil record showsrecords show that they could evolve some sort of neuron cells similar to those found in humanhumans and current theory suggestsuggests they could be extremely intelligenceintelligent.