Facts about Brittle Star
- 09
Lacking a brain, brittle stars process sensory information through a decentralized nervous system consisting of a nerve ring and radial nerve cords running through each arm.
- 08
Brittle star eyes, located on their arm tips rather than a centralized head, allow them to detect light and shadow despite lacking complex visual organs found in other echinoderms.
- 07
Brittle stars possess a unique water vascular system that allows them to move their arms without muscular contraction, instead using hydraulic pressure generated by seawater pumped through internal canals.
- 06
Over 2,000 species of brittle stars exist across Earth's oceans, making them one of the most diverse groups of echinoderms by species count.
- 05
Most brittle stars inhabit depths between 200 and 6,000 meters, with some species thriving in the abyssal zone where they represent up to 90 percent of echinoderms by biomass.
- 04
The brittle star's central disk contains a complete digestive system, allowing some species to extrude their stomach through their mouth to consume prey larger than their body opening.
- 03
Brittle star tube feet lack suckers, instead relying on mucus and chemical sensing to locate food particles on the ocean floor.
- 02
Five arms radiate from the central disk of most brittle stars, allowing them to move across the ocean floor at speeds up to 10 body lengths per second.
- 01
Ophiuroids can regenerate lost arms over several months, with some species capable of regrowing a complete limb within 6 to 12 months.