From 2speccers2tools wiki

Some benthic Common Diarroebas suddenly began prowling the surface of the ground, instead of in it, feeding on a somewhat different array of food than their cousins, increasing massively in size due to this and resulting in the Superspeudopottyrrhea. They are very large for a Diarrhea Cell, and walk along the sea floor via several large pseudopods that can also be used to grab and absorb food. They are a dark orange-brown, similar to Radiobiota, and protects them from many predators. They also have a mild resistance to radiation. They are still able to sort of swim and dig, though they aren't too good at either of these, and rarely try doing these.