Japanese Trapdoor Snails can have a wide variety of colorations on their shells. The shells can range in color from varying shades of black, brown, and green. The shells can even have white mixed in. For the snail body, you can expect it to be the typical brownish-tan coloration that you can find in most snails, with antennae that extend outward. The texture of the Japanese Trapdoor Snail’s shell is slightly grooved due to the growth pattern.