Linckia laevigata (Blue Sea Star)

Details

Linckia laevigata—the blue sea star—is an ophidiasterid asteroid conspicuous on tropical Indo‑Pacific reefs. It is best known for its vivid blue coloration (purple/green/brown or mottled morphs occur) and its remarkable ability for arm autotomy and regeneration, producing “comet” forms from detached arms.

Ecology & Biology

• Diet: grazes biofilms, microalgae and detritus, and may scavenge carrion.

• Reproduction: chiefly a broadcast spawner; also capable of asexual arm‑based regeneration (comet forms developing into complete stars).

• Regeneration: strong autotomy/regrowth makes it a model in echinoderm regeneration studies.

Identification

Typically five long cylindrical arms with blunt tips; dorsum relatively smooth (the epithet “laevigata” means “smooth”). The oral side shows ambulacral grooves and tube feet. Colour most often cobalt/azure blue with regional variation.

Size & Longevity

• Size: arm‑to‑arm diameter commonly 15–30 cm.

• Life: usually several years, depending on conditions.

Range & Habitat

Widespread across the tropical Indo‑Pacific on shallow reef flats/slopes and lagoons over hard or coral‑rubble substrates (~1–25+ m).

People & Conservation

• Handling: avoid lifting or prolonged exposure to air—skin is delicate and stress can trigger autotomy.

• Pressures: habitat degradation and collection for the curio/aquarium trade; practice no‑touch viewing and sustainable management.

IUCN: marked here as Not Evaluated (NE) for this overview; see species‑level assessments for updates.