Sea Floor Engineers Brittle Stars

Compared to sea stars brittle stars arms and central disk are much more distinctly separated and their arms allow them to move gracefully and purposefully in a rowing movement.

Sea floor engineers brittle stars.

Lance horn uncw nurc phantom ii rov operator. These species live in the sand or mud just below the low tide mark. They also provide nutrition to fish sea stars and crab predators. Many species act as ecosystem engineers by digging through sediments on the seafloor while others recycle nutrients in their roles as scavengers and detritivores providing key sources of nutrition to other organisms including fish starfish and invertebrate predators such as crabs.

Brittle stars occupy many marine habitats often at great depths. Brittle stars ophiuroidea are a group of echinoderms that resemble starfish. Some are deposit feeders and feed on organic particles that settle on the seafloor. Different species of brittle stars eat in different ways some are suspension feeders and eat food particles suspended in the water.

Brittle stars ophiurida are echinoderms the same family that includes sea stars commonly called starfish sea urchins sand dollars and sea cucumbers. And some are active predators detecting food by its odor. First they are known to be seafloor ecosystem engineers. There are about 1500 species of brittle stars alive today and most species inhabit marine habitats with depths greater than 1500 feet.

They crawl across the sea floor using their flexible arms for locomotion. Brittle stars play an important role in the arctic food web. We re dedicated to working with indigenous communities legislators scientists and people like you to advocate for science based solutions to protect this fragile ecosystem. Brittle stars live on spiny sponges and other sessile animals at the bottom of the deep sea as well as by themselves and in abundant masses directly on the seafloor.

Brittle stars or ophiuroids are echinoderms in the class ophiuroidea closely related to starfish. There are a few species of shallow water brittle stars. Sea stars are in the class asteroidea where brittle stars are in ophiuroidea which also includes basket stars. Brittle stars play important ecological roles in these deep sea habitats.

Sea star by andrew david noaa nmfs sefsc panama city. Brittle stars or serpent stars ophiuroidea ophiurida are closely related to starfish. They reshape the seafloor sediment surface and influence the distribution of other seafloor species. They are capable of moving jerkily but usually cling to the seafloor or to sponges or cnidarians e g coral.

They crawl across the sea floor using their flexible arms for locomotion. However they sometimes trap sizable animals. The ophiuroids generally have five long slender whip like arms which may reach up to 60 cm 24 in in length on the largest specimens.