Phenotypic species have obvious marginal plates, sucker at the bottom of the tube, and may not have anus. Including most deep-sea species, such as albatross richardi, which was found at a depth of 6035 meters (19800 feet). The radial diameter of the mud starfish (Ctenodiscus crispatus) is about 10 cm, the wrist is short and blunt, the body plate is wide and yellow, and it is abundant in the mud bottom along the northern coast. Northern genera, such as Astropecten, Psilaster and Luidia, have long and sharp wrists with thorns on the edges. The largest reticular starfish in the West Indies has a radial diameter of about 50 cm (20 inches). Lin Kia, mostly found in the Indian Ocean-Pacific Ocean, can grow into a new individual from a small wrist.