Guardian Nature School Contact Blog Project Noah Facebook Project Noah Twitter

A global citizen science platform
to discover, share and identify wildlife

Join Project Noah!
nature school apple icon

Nature School For Teachers - Fall 2020 Launch! visit nature school

Crown-of-thorns starfish

Acanthaster planci


About 30cm in size, grey-green color, with a central disk and flexible, prehensile, and spined radiating multi arms. It is one of the largest sea stars in the world.


Spotted at Pulu Cinta, a sandy atoll reef at Sulawesi, Indonesia. It can be found across Indo-Pacific area, Australia, tropical and subtropical latitudes from the Red Sea and the east African coast across the Indian Ocean, and across the Pacific Ocean to the west coast of Central America. Usually preys upon hard, or stony, coral polyps.


The crown-of-thorns sea star receives its name from venomous thorn-like spines that cover its upper surface, resembling the Biblical crown of thorns. Kingdom: Animalia Phylum: Echinodermata Class: Asteroidea Order: Valvatida Family: Acanthasteridae Genus: Acanthaster Species: Acanthaster planci

Species ID Suggestions

Sign in to suggest organism ID

No Comments

Spotted by

Gorontalo, Indonesia

Spotted on Aug 4, 2016
Submitted on Jan 25, 2017

Spotted for Mission

Related Spottings

Crown of thorns sea star Corona de espinas (Crown-of-thorns starfish) Crown of Thorns Seastar Crown of Thorns Sea Star

Nearby Spottings

Diadema setosum flower urchin Cushion Starfish Ctenactis echinata
Noah Guardians
Noah Sponsors