Acropora tenella

It was described by Brook in 1892 as Madrepora tenella. It is also known under its synonym of Acropora eibli, which it was described under by Pillai and Scheer in 1976.[2]

It occurs in colonies with plate-like structures arranged horizontally. Its branches are flattened and often diverge; they often contain broad central ridges. Its axial corallites are distinct; it has radial corallites that are distinct and are laterally present on some older branches but are generally placed irregularly over the branches. The coral is cream in colour and its branches have either blue or white ends.[3]

It is classified as a vulnerable species on the IUCN Red List and it is believed that its population is decreasing in line with the global decline of coral reefs; the species is also listed under Appendix II of CITES. Figures of the population of A. tenella are unknown, but is likely to be threatened by the global reduction of coral reefs, the increase of temperature causing coral bleaching, climate change, human activity, the crown-of-thorns starfish and disease.[1] It occurs in the central Indo-Pacific, southeast Asia, Japan, the East China Sea and the oceanic western Pacific Ocean. The species is found at depths of between 25 and 70 metres (82 and 230 ft) on the lower slopes of reefs.[1]