Merulina cylindrica

Merulina cylindrica is a reef-associated coral species found primarily in the Indo-West Pacific region. It thrives in tropical waters and is commonly found at depths ranging from the surface down to 40 meters. Most occurrences are in shallower waters, with 90% of sightings at depths less than 20 meters. This coral is part of the family Merulinidae and is recognized for its unique cylindrical shape, which can help divers distinguish it from other coral species. The species is hermaphroditic, meaning it possesses both male and female reproductive organs. Mature gametes are released into the coelenteron and then spawned through the mouth. The life cycle begins with the zygote developing into a planktonic planula larva, which eventually undergoes metamorphosis. This process includes the early development of tentacles, septa, and pharynx before the larva settles on its aboral end. Divers encountering Merulina cylindrica can expect to find it in reef environments, often forming colonies that contribute to the complex structure of coral reefs. The species is currently listed as Least Concern on the IUCN Red List.