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.
