Blue Linckia (Linckia laevigata)
Ranges in color morphs from dark or light blue, but also observed as aqua, purple, or even orange variations throughout the ocean. Grows up to 30 cm in diameter and has rounded arm tips. Some individuals can have lighter or darker spots along their arms. They are typically firm in texture and have slightly tubular arms with short, yellowish tube feet on the underside. It inhabits coral reefs and sea grass beds. They occur subtidally, sometimes intertidally, on fine sand or hard surfaces and move quite slowly .
Cushioning Star (Culcita nouvaeguineae)
The cushion star has very short arms and an inflated appearance, resembling a pentagonal pincushion. Its colour is variable and it occurs in tropical warm waters in the Indo-Pacific. It ranges from Madagascar and the Seychelles to the Philippines, New Guinea, Australia and Hawaii. It feeds on detritus and small invertebrates, including stony corals.