How many species live in The Houtman Abrolhos reef?
Houtman Abrolhos
{'answer_start': array([-1]), 'answer_text': array([''], dtype=object)}
492 species of marine mollusc have been recorded from the shallow waters of the Houtman Abrolhos. These are predominantly gastropods (346 species, 70%) and bivalves (124, 25%); the remaining 5% of species consist of cephalopods (14 species), chitons (5 species) and scaphopods (3 species). About two thirds of the species have a tropical distribution, temperate species account for 20%, and the remaining 11% are endemic to Western Australia.[62] For a full list, see List of molluscs of the Houtman Abrolhos.