Eviota sigillata

Eviota sigillata, commonly called the seven-figure pygmy goby or the adorned dwarfgoby, is a very small species of marine fish in the family Gobiidae. It is widespread through the tropical waters of the Indo-West Pacific, from the Seychelles to Micronesia, and lives in reef habitats at depths of 3 to 20 metres. It reaches a length of only about 3 centimetres. It is best known for its extraordinary life cycle, which is the shortest recorded for any vertebrate: it lives for at most 59 days, of which about three weeks are spent as pelagic larvae drifting in open water, two weeks settling onto the reef, and three weeks as an adult.