tube feet
sea lilies and feather stars
sea lilies and feather stars
Each species has its own scientific name however, their class is Ophiuroidea.
Starfishes, or sea stars, are members of the do-all-starfishes-or-sea-stars-have-five-armsAsteroidea. Their bodies consist of a central disk from which radiate from five to more than twenty arms or rays
Asteroidea, or sea stars, have a radial symmetry with five or more arms extending from a central disc. They have a calcareous endoskeleton made up of ossicles, and a water vascular system with tube feet used for movement and feeding. Their arms contain a network of nerves and muscles for coordination and locomotion.
Sea stars have a decentralized nervous system that lacks a central brain. Instead, it consists of a nerve net and a series of radial nerves extending from a central nerve ring, allowing them to coordinate movement and respond to their environment. Sensory cells located on their arms help them detect light, chemicals, and touch, contributing to their ability to navigate and hunt for food. This simple yet effective system enables sea stars to thrive in their marine habitats.
Sea urchins, sand dollars, and sea stars are classified in the phylum Echinodermata. They have a spiny exterior and tube feet that they use for movement and feeding.
The size of a starfish or sea star can vary. There are over 2,000 different species of sea stars that have 5, 10, 20, 40 or more arms.
Includes: Sea Stars, Sea Lillies, Sea Urchins, Sea Cucumbers, Brittle Stars
well, they basicly grow back like human arms. it's the same format.
sea stars have NO brains