macro Madracis decactis colony coral polyps, Alcatrazes island, Sao Paulo state shore, Brazil

---

Colonies are low and encrusting, with short stumpy nodules and short branches. Some colonies are encrusting only, with low, club-shaped nodules, irregular or flattened. Corallites have 10 septa which reach the columella. This species of Madracis is darker in colour than most, being greenish to brown, yellow-brown or grey. Polyps are not yellow, as they are in M. formosa. Found in a variety of habitats, especially overhangs and steep or vertical surfaces.

---

Size: 4928px × 3263px
Location: Alcatarzes island, Sao Paulo, Brazil
Photo credit: © Leo Francini / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: alcatrazes, animalia, anthozoa, brazil, class, cnidaria, colony, coral, decactis, genus, hexacorallia, island, kingdom, madracis, ocean, order, paulo, phylum, polyps, reef, sao, scleractinia, sea, shore, species, state, subclass