Omegiiro

The omegiiro replaced its ancestor in the Elerd Temperate Coast. It has a "skeleton" of glucomannan that keeps calcium oxalate crystals in place. The calcium oxalate crystals are especially concentrated in the hardened ridges of its body. The ridges on the longitudinal axis resemble the omega symbol, hence the name "omegiiro." The glucomannan and calcium oxalate "skeleton" make it slightly stiffer than its ancestor. If a predator should try to eat the omegiiro, the calcium oxalate crystals can cause swelling in the mouth and a burning sensation. (among other unpleasant effects) On a less painful note, the calcium oxalate crystals also give the omegiiro a grainy texture, which would be unpleasant to predators accustomed to squishy, gelatinous foods. The omegiiro evolved from ouchiiros in the Elerd Temperate Coast, which had to contend with both the Twinkiiro Gilltail and the Diamond Pumpgill. With so many predators around, they had to adapt. The "skeleton" of glucomannan and calcium oxalate crystals made omegiiros so icky to their predators that their predators usually avoided eating them, much like children stereotypically avoid spinach.