Accidentally introduced from New Zealand, the regular seastar is small, with arms no longer than 4.5 cm. They can be a variety of colours, from blue, to green, orange, red or brown. They live on both hard and soft surfaces, from the inter-tidal zone down to 100 m. Regular seastars are a scavenger eating dead animals (such as crabs, fish, sponges and molluscs) as well as algae. When food items are too large to fit in their mouth the regular sea star can push part of its stomach outside its body to digest food. As an introduced species in Tasmania, it competes with native seastars for food and habitat.