The region with the highest species richness of brittle stars is the Indo-Pacific region with 825 species at all depths. There are about 1500 species of brittle stars alive today and most species inhabit marine habitats with depths greater than 1500 feet. This deepens and widens until it extends across the disk and the animal splits in two. This rowing motion looks similar to the way a There are male and female brittle stars, although it is not obvious which sex a brittle star is without looking at its genitals, which are located inside its central disk. The time period between successive divisions is 89 days, so theoretically, each brittle star can produce 15 new individuals during the course of a year.Brittle stars generally sexually mature in two to three years, become full grown in three to four years, and live up to 5 years.Brittle stars use their arms for locomotion. Brittle stars, like all echinoderms, lack a brain. These species are very popular in the aquarium trade for their bright and exotic colors and hardiness in the tank. Of all echinoderms, the Ophiuroidea may have the strongest tendency toward five-segment radial (pentaradial) symmetry. She serves as the executive director of the Blue Ocean Society for Marine Conservation.Echinoderms: Starfish, Sand Dollars, and Sea UrchinsAll About the Animals Belonging to Class Asteroidea I have a Green Brittle Star and he eats whatever I feed my fish. In many species, larvae develop inside the body of the parent.When an arm is lost, brittle stars often regenerate the lost limb. Brittle stars have a mouth that has five jaw-like structures around it. Ophiuroida move horizontally, and The sexes are separate in most species, though a few are hermaphroditic or Many species brood developing larvae in the bursae, effectively giving birth to live young. Their long, thin arms—usually five and often forked and spiny—are distinctly set off from the small disk-shaped body. The The nervous system consists of a main nerve ring which runs around the central disk. The underside of the disk contains the mouth, which has five toothed jaws formed from skeletal plates. Euryalids are similar to ophiurids, if larger, but their arms are forked and branched. The axial leg may be facing or trailing the direction of motion, and due to the radially symmetrical nervous system, can be changed whenever a change in direction is necessary.Brittle stars live in areas from the low-tide level downwards. They use the spines on their … Ophiuroid podia generally function as sensory organs. They often live amongst coral and sponges as well.Brittle stars inhabit all the world's oceans and live in a variety of climate regions including tropical, temperate and polar waters. Basket stars feed on plankton and bacteria they catch by suspension feeding. Their life span is generally about 5 years. This results in a free-swimming larva called an ophiopluteus, which eventually settles to the bottom and forms a brittle star shape.Some brittle star species may also reproduce asexually through a process called fission. Jennifer Kennedy, M.S., is an environmental educator specializing in marine life. New arms begin to grow before the fission is complete, thus minimizing the time between possible successive divisions. The ossicles are encased in soft tissue and jointed plates that run the length of the arm.Brittle stars have a nervous system that consists of a nerve ring and that encircles their central body disk. Brittle stars are subdivided into two basic groups, the brittle stars (Ophiurida) and the basket stars (Euryalida).Brittle stars have a star shaped body. In modern forms, the vertebrae occur along the median of the arm. These "vertebrae" articulate by means of ball-in-socket joints, and are controlled by muscles. However, they have several types of sensitive nerve endings in their epidermis, and are able to sense chemicals in the water, touch, and even the presence or absence of light.The mouth is rimmed with five jaws, and serves as an anus (Gas exchange and excretion occur through cilia-lined sacs called bursae; each opens between the arm bases on the underside of the disk. Brittle stars are a moderately popular invertebrate in Larger brittle stars are popular because, unlike Asteroidea, they are not generally seen as a threat to coral, and are also faster-moving and more active than their more archetypical cousins. The arms are clearly delineated from the central body disk, and in this way brittle stars can be distinguished from starfish (starfish arms blend with the central body disk such that it is not easy to delineate where the arm ends and the central body disk begins).Brittle stars move using a water vascular system and tube feet.
The mouth has five jaws around it, and crunched up food particles are transported from the mouth to the esophagus and then to the stomach, which takes up much of the brittle star's central disk. The largest known brittle star is Brittle stars occur in all the world's oceans from the deep sea to intertidal zones, and including salt and brackish polar areas, temperate, and tropical waters. Laura Klappenbach, M.S., is a science writer specializing in ecology, biology, and wildlife.Echinoderms: Starfish, Sand Dollars, and Sea UrchinsAll About the Animals Belonging to Class Asteroidea A A brittle star's arms are supported by vertebral ossicles, plates made from calcium carbonate. They have tube feet on their underside, like sea stars, but the feet do not have suction cups at the end and are not used for locomotion—they are used for feeding and to help the brittle star sense its environment.
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