At first glance, starfish, more properly called sea stars, aren't doing much of anything. They also come in a variety of colors ranging from orange, red, purple and others. The Ochre Sea Star. Using small tubelike structures on the ends of its arms, the large purple starfish pries open its prey. Seagulls are able to eat the entire starfish. Stone Lillies! Sea urchins will eat just about anything that floats by. Sea stars, sea urchins and other echinoderms. Six armed sea star; arm radius to 4 cm; mottled green, purple or red with irregular white bands. Common in pools & under rocks, mid- & low intertidal zones & subtidal; protected outer coast. The Sunflower sea star (Pycnopodia helianthoides) is the largest: fully grown, its arm-span is about a metre. Starfish, or sea stars, are Echinoderms of the Class Asteroidea. The purple starfish has a tubelike stomach, too; it extends and inserts into the shell of its prey to eat. Purple Star or Ochre Star (Pisaster ochraceus) Purple or Ochre Stars are one of the most common sea In the New Zealand region, there are at least 184 species. Predator-prey interactions: how sea stars prey on mussels. Step into the underwater world of wonderful shapes and colours and see some of the spiniest animals beneath the waves. Be careful handling these animals. Many different animals eat sea stars, including fish, sea turtles, snails, crabs, shrimp, otters, birds and even other sea stars. Sea Urchins! All live in the ocean, on the sea floor.Many starfish live in deep water, others in shallow water. They are mostly ugly, but some people cook and eat them. Sea urchins also have tube feet and pincer-like parts called pedicellaria. Blastozoans! Sea cucumbers. Their five arms carry them through the water. Predators with smaller mouths can flip the sea star over and eat … Echinoderms (Ancient Greek: ekhinos = spiny, derma = skin) include sea stars, sea urchins, feather stars, brittle stars and sea cucumbers. The blood star, with its bright red (or orange or yellow) color, feeds on sponges.Most of the other tide pool animals can eat very tiny sea stars, but no tide pool animal can eat an adult sea star. New Zealand has 100 types. The Bat star is easily recognizable in that the arms are connected by a web. Some live in the intertidal zone, between low and high tide. These ancient creatures have a stalk that clings to the sea floor, and they look like feather dusters. There are 165 New Zealand species. The group includes some very spiny species like sea urchins, sea cucumbers and brittle stars. The ochre sea star has a variety of colours. Their biology and evolution includes a wide range of crazy and wonderful things. Mussels close-up tightly but strong sea stars can still pry them open. Starfish do not always have five arms, some species have more. Adult sea stars are always benthic, which means they live on or near the seabed – however, their habitats vary from intertidal rock pools to the deep seafloor. Bat stars are omnivorous in that they will eat both plant and animals. Although the word starfish is still a popular term, scientists generally use the word sea star for the animals because they aren't fish or even vertebrates. They have five or more arms and can be quite large. The ochre sea star is a predatory carnivore that feeds on a diet of mussels, clams, limpets, snails and barnacles. Their poop is full of ground-up bits of purple-coloured sand as a result. There are an estimated 2,000 species of sea stars living throughout the world’s oceans. Colours can vary so dramatically in this species, from light olive green to pink to a dark purple, that the Purple Sea Urchin was once thought to be three separate species. Like all sea stars, brown spiny sea star exhibits radial symmetry, and reaches a diameter of 4 to 5 inches (10.2 to 12.7 cm). Marine invertebrates found throughout the world's oceans with a rich and ancient fossil legacy. Its sharp teeth can scrape algae off rocks, and grind up plankton, kelp, periwinkles, and sometimes even barnacles and mussels.. Sea urchins are sought out as food by birds, sea stars, cod, lobsters, and foxes.In the northwest, sea otters are common predators of the purple sea urchin. The Purple Sea Urchin is one of the most common sea urchins found on Sydney's coast. Generalist predator, feeds on small snails, small mussels & barnacles, sea cucumbers. They are frequently molted and may have more than one color. Echinodermata! Starfish! For example the common sun star and the seven armed starfish, both found in British waters and the crown of thorns starfish … The tube feet will suction onto surfaces. A slender sea star ranging in color from reddish tan to bright orange, with brighter color concentrated on the ends of the arms. Sea Daisies! Forcefully pulling a sea urchin off a rock could injure it, making life harder for the sea urchin. Brittle stars. Sea lilies. Like other sea stars, Pisaster ochraceus belongs to the phylum Echinodermata and the class Asteroidea. Sea Cucumbers! Characteristics of sea stars. Feather Stars! Habitat: found along the east coast and commonly along the southeast coast of the United States Status: Not Evaluated The Royal Starfish (Astropecten articulatus) is unbelievably epic; draped in decadent Sea stars dine out (or in, if you're a mollusk) on mussels, snails, oysters, worms and crustaceans.Some sea stars scavenge for decaying matter (or detritus) on the surface of the mud. Yes, starfish is technically edible. Identification. Through natural selection predators and their prey adapt ways of hunting and defense. 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