Acropora corals belong to the category of hard corals classified as SPS. SPS is the acronym for Short Polyp Stony Corals. SPS corals also belong to the order of Scleractinias. They are characterized by a calcareous and branched skeleton with short polyps. Among the most common species of Acropora: Acropora tenuis, Acropora millepora, Acropora nobils, Acropora microclados, Acropora valid, Acropora nasuta, Acropora hyacinthus, Acropora spathulata, Acropora Hechinata.