Crown-of-thorns starfish actually four species | Practical Fishkeeping magazine

http://www.practicalfishkeeping.co.uk/pfk/pages/item.php?news=1879 ---
A study published in the latest issue of the journal Biology Letters
has identified the crown-of-thorns starfish (Acanthaster planci), a
species thought to be widely distributed throughout the Indo-Pacific,
to consist of a species complex with as many as four species.