The greengill split from its ancestor the deep urchip and moved to the coasts where if feeds on the marine shrubite. It has developed a more advanced locomotion and respiratory system. On its face are many gill slits, which suck in water. They are green in color because of their sulfur based blood. At the top of their conical calcium shell are 2 siphons, which expelled the water that is breathed in by the gills. This helps it not only move, but they can direct them to one side or another for better directional movement.
Like their ancestor, they have a long hollow tooth between their legs which they use to eat. Inside the tooth is a strong acid that can melt and dissolve the shrubite into a liquid so it can drink it. They have 2 sexes and will mate each full moon. Once the eggs are fertilized, the female will expel the eggs out of the siphons at the top of its shell directly into the water. The offspring must survive on their own. Many do not even reach adulthood.