Luidia

Characteristics

The defining characteristic of Luidia starfish is their peculiar arm structure. Their arms are distinctly long and thin, sometimes even exceeding the diameter of the central disc. These arms are not only long but also flexible, allowing them to easily maneuver in the sand. Luidia species also possess a remarkable ability to regenerate lost arms, a characteristic shared by many other starfish.

Their body is covered in small, overlapping scales that give them a rough texture. The upper surface of the starfish is often mottled brown or grey, blending in well with the sandy environment. Some species may display more vivid colors, ranging from reddish-brown to yellowish-grey.

Environments

Luidia species are primarily found in sandy bottoms, often in shallow coastal waters. They are commonly encountered in intertidal zones and subtidal regions, typically residing in depths up to 100 meters. Their preference for sandy environments is likely due to their burrowing capabilities, which allow them to find shelter and escape predators. Luidia starfish are primarily found in tropical and subtropical waters worldwide, with a particular concentration in the Indo-Pacific region.

Diet and Behavior

Luidia starfish are carnivorous, feeding primarily on small invertebrates like crustaceans, mollusks, and worms. They use their tube feet to capture prey, often using a suction mechanism to hold onto their meal. Luidia starfish are mostly nocturnal, emerging from their burrows at night to forage. During the day, they bury themselves in the sand, hiding from predators. They are also known to exhibit a "righting reflex," which enables them to turn themselves over if they become overturned.

Species

The genus Luidia includes a variety of species, some of the most common and well-studied include:

• Luidia clathrata
• Luidia senegalensis
• Luidia alternata
• Luidia foliolata
• Luidia annulata

References

• World Register of Marine Species (WoRMS)
• ResearchGate
• JSTOR