Blue Linckia

Overview

The Blue Linckia is a striking sea star widely distributed across the tropical Indo-Pacific region. Often found in shallow coral reef environments, it is easily recognized by its vibrant coloration and five slender, cylindrical arms.

Distribution & habitat

This species inhabits warm, tropical waters, commonly residing on coral reefs, reef flats, and sea grass beds. It is frequently encountered in both subtidal and intertidal zones, often resting on hard or sandy substrates.

Appearance

Typically reaching 25 to 40 cm in diameter, the Blue Linckia features five long, rounded arms radiating from a central disc. While most famous for its brilliant cobalt or light blue hue, individuals can also exhibit shades of purple, pink, orange, or green. The surface is covered in small, bumpy textures known as papulae, which assist with respiration, and the underside is lined with short, yellowish tube feet used for movement.

Biology & behavior

These sea stars are generally solitary and move slowly across the seafloor. They are nocturnal, often seeking shelter within rock crevices during the day. They possess remarkable regenerative abilities, allowing them to recover from injury or even reproduce asexually by dividing through the disc. They are also known for their sensitivity to environmental changes, including water quality and temperature.

Feeding

Rather than hunting active prey, the Blue Linckia acts as a scavenger. It feeds primarily on detritus, microbes, and algae found on the reef surface, often everting its cardiac stomach to digest food externally.