Brain coral (Platygyra daedalea) April 25, 2015 · by seasecretsdivers · in Marine Life Marsa Alam. · Platygyra daedalea is thought to be a relatively ‘aggressive’ coral, producing elongated tentacles, known as ‘sweeper tentacles’, which can damage the tissues of neighbouring corals, helping Platygyra daedalea to compete for space on the reef. Share this:SharePinterestLinkedInTwitterFacebookLike Loading...