''Acropora'' is a genus of small polyp Scleractinia, stony coral in the phylum Cnidaria. Some of its species are known as table coral, elkhorn coral, and staghorn coral. Over 149 species are described. ''Acropora'' species are some of the major reef corals responsible for building the immense calcium carbonate substructure that supports the thin living skin of a reef.

Anatomy and distribution

Depending on the species and location, ''Acropora'' species may grow as plates or slender or broad branches. Like other corals, ''Acropora'' corals are colonies of individual polyps, which are about 2 mm across and share tissue (biology), tissue and a nerve net. The polyps can withdraw back into the coral in response to movement or disturbance by potential predators, but when undisturbed, they protrude slightly. The polyps typically extend further at night to help capture plankton and organic matter from the water. The species are distributed in the Indo-Pacific (over 100 species) and Caribbean (3 species). However, the true number of species is unknown: firstly, the validity of many of these species is questioned as some have been shown to represent hybrids, for example ''Acropora prolifera''; and secondly, some species have been shown to represent cryptic species complexes.

Threats

''Symbiodinium'', symbiotic algae, live in the corals' cell (biology), cells and produce energy for the animals through photosynthesis. Environmental destruction has led to a dwindling of populations of ''Acropora'', along with other coral species. ''Acropora'' is especially susceptible to Coral bleaching, bleaching when stressed. Bleaching is due to the loss of the coral's zooxanthellae, which are a golden-brown color. Bleached corals are stark white and may die if new ''Symbiodinium'' cells cannot be assimilated. Common causes of bleaching and coral death include pollution, abnormally warm water temperatures, increased ocean acidification, sedimentation, and eutrophication. In 2014 the U.S. Fish and Wildlife Service listed ten ''Acropora'' species as 'threatened'.

Reef-keeping

Most ''Acropora'' species are brown or green, but a few are brightly colored, and those rare corals are prized by aquarists. Captive propagation of ''Acropora'' is widespread in the reef-keeping community. Given the right conditions, many ''Acropora'' species grow quickly, and individual colonies can exceed a meter across in the wild. In a well-maintained reef aquarium, finger-sized fragments can grow into medicine ball-sized colonies in one to two years. Captive specimens are steadily undergoing changes due to selection which enable them to thrive in the home aquarium. In some cases, fragments of captive specimens are used to repopulate barren reefs in the wild. ''Acropora'' species are challenging to keep in a home aquarium. They require bright light, stable temperatures, regular addition of calcium and alkalinity supplements, and clean, turbulent water. Common parasites of colonies in reef aquariums are "Acropora-eating flatworms" Acropora Eating Flatworm, ''Amakusaplana acroporae'', and "red bugs" (''Tegastes acroporanus'').

Species

The following species are recognised in the genus ''Acropora'': *''Acropora abrolhosensis'' Veron, 1985 *''Acropora abrotanoides'' (Lamarck, 1816) *''Acropora acervata'' (Dana, 1846) *''Acropora aculeus'' (Dana, 1846) *''Acropora acuminata'' (Verrill, 1864) *''Acropora alvarezi''† Wallace, 2008 *''Acropora anglica''† (Duncan, 1866) *''Acropora anthocercis'' (Brook, 1893) *''Acropora arabensis'' Hodgson and Carpenter, 1995 *''Acropora arafura'' Wallace, Done & Muir, 2012 *''Acropora aspera'' (Dana, 1846) *''Acropora austera'' (Dana, 1846) *''Acropora awi'' Carden Wallace, Wallace and Wolstenholme, 1998 *''Acropora bartonensis''† Wallace, 2008 *''Acropora batunai'' Carden Wallace, Wallace, 1997 *''Acropora borneoensis''† (Felix, 1921) *''Acropora branchi'' Riegl, 1995 *''Acropora britannica''† Wallace, 2008 *''Acropora bushyensis'' Veron and Wallace, 1984 *''Acropora capillaris'' (Klunzinger, 1879) *''Acropora cardenae'' Wells, 1986 *''Acropora carduus'' (Dana, 1846) *''Acropora caroliniana'' Nemenzo, 1976 *''Acropora cerealis'' (Dana, 1846) *''Acropora cervicornis'' (Lamarck, 1816) - staghorn coral *''Acropora chesterfieldensis'' Veron and Wallace, 1984 *''Acropora clathrata'' (Brook, 1891) *''Acropora cytherea'' (Dana, 1846) *''Acropora darrellae''† Santodomingo, Wallace & Johnson, 2015 *''Acropora deformis''† (Michelin, 1840) *''Acropora dendrum'' (Bassett-Smith, 1890) *''Acropora derawaensis'' Wallace, 1997 *''Acropora desalwii'' Wallace, 1994 *''Acropora digitifera'' (Dana, 1846) *''Acropora divaricata'' (Dana, 1846) *''Acropora donei'' Veron and Wallace, 1984 *''Acropora downingi'' Wallace, 1999 *''Acropora duncani''† (Reuss, 1866) *''Acropora echinata'' (Dana, 1846) *''Acropora elegans'' (Milne-Edwards and Haime, 1860) *''Acropora elenae''† Santodomingo, Wallace & Johnson, 2015 *''Acropora elseyi'' (Brook, 1892) *''Acropora emanuelae''† Santodomingo, Wallace & Johnson, 2015 *''Acropora eurystoma'' (Klunzinger, 1879) *''Acropora fastigata'' Nemenzo, 1967 *''Acropora fennemai''† (Gerth, 1921) *''Acropora fenneri'' Veron, 2000 *''Acropora filiformis'' Veron, 2000 *''Acropora florida'' (Dana, 1846) *''Acropora gemmifera'' (Brook, 1892) *''Acropora glauca'' (Brook, 1893) *''Acropora globiceps'' (Dana, 1846) *''Acropora gomezi'' Veron, 2000 *''Acropora grandis'' (Brook, 1892) *''Acropora granulosa'' (Milne-Edwards and Haime, 1860) *''Acropora haidingeri''† (Reuss, 1864) *''Acropora halmaherae'' Wallace and Wolstenholme, 1998 *''Acropora hasibuani''† Santodomingo, Wallace & Johnson, 2015 *''Acropora hemprichii'' (Ehrenberg, 1834) *''Acropora herklotsi''† (Reuss, 1866) *''Acropora hoeksemai'' Wallace, 1997 *''Acropora horrida'' (Dana, 1846) *''Acropora humilis'' (Dana, 1846) *''Acropora hyacinthus'' (Dana, 1846) *''Acropora indonesia'' Wallace, 1997 *''Acropora intermedia'' (Brook, 1891) *''Acropora jacquelineae'' Wallace, 1994 *''Acropora japonica'' Veron, 2000 *''Acropora kimbeensis'' Wallace, 1999 *''Acropora kirstyae'' Veron and Wallace, 1984 *''Acropora kosurini'' Wallace, 1994 *''Acropora lamarcki'' Veron, 2000 *''Acropora latistella'' (Brook, 1892) *''Acropora laurae''† Santodomingo, Wallace & Johnson, 2015 *''Acropora lavandulina''† (Michelin, 1840) *''Acropora listeri'' (Brook, 1893) *''Acropora loisetteae'' Wallace, 1994 *''Acropora lokani'' Wallace, 1994 *''Acropora longicyathus'' (Milne-Edwards and Haime, 1860) *''Acropora loripes'' (Brook, 1892) *''Acropora lovelli'' Veron and Wallace, 1984 *''Acropora lutkeni'' Crossland, 1952 *''Acropora macrocalyx''† Wallace & Bosselini, 2015 *''Acropora microclados'' (Ehrenberg, 1834) *''Acropora microphthalma'' (Verrill, 1869) *''Acropora millepora'' (Ehrenberg, 1834) *''Acropora monticulosa'' (Brueggemann, 1879) *''Acropora mossambica'' Riegl, 1995 *''Acropora multiacuta'' Nemenzo, 1967 *''Acropora muricata'' (Linnaeus, 1758) *''Acropora nana'' (Studer, 1878) *''Acropora nasuta'' (Dana, 1846) *''Acropora natalensis'' Riegl, 1995 *''Acropora ornata''† (DeFrance, 1828) *''Acropora palmata'' (Lamarck, 1816) - elkhorn coral *''Acropora palmerae'' Wells, 1954 *''Acropora paniculata'' Verrill, 1902 *''Acropora papillare'' Latypov, 1992 *''Acropora pectinata'' Veron, 2000 *''Acropora pharaonis'' (Milne-Edwards and Haime, 1860) *''Acropora pichoni'' Wallace, 1999 *''Acropora piedmontensis''† Wallace & Bosselini, 2015 *''Acropora plumosa'' Wallace and Wolstenholme, 1998 *''Acropora polystoma'' (Brook, 1891) *''Acropora prolifera'' (Lamarck, 1816) - fused staghorn coral *''Acropora proteacea''† Wallace, 2008 *''Acropora proximalis'' Veron, 2000 *''Acropora pulchra'' (Brook, 1891) *''Acropora renemai''† Santodomingo, Wallace & Johnson, 2015 *''Acropora retusa'' (Dana, 1846) *''Acropora ridzwani'' Ditlev, 2003 *''Acropora robusta'' (Dana, 1846) *''Acropora roemeri''† (Duncan, 1866) *''Acropora rongelapensis'' Richards & Wallace, 2004 *''Acropora roseni'' Wallace, 1999 *''Acropora rudis'' (Rehberg, 1892) *''Acropora rufa'' Veron, 2000 *''Acropora russelli'' Wallace, 1994 *''Acropora salentina''† Wallace & Bosselini, 2015 *''Acropora samoensis'' (Brook, 1891) *''Acropora sarmentosa'' (Brook, 1892) *''Acropora secale'' (Studer, 1878) *''Acropora selago'' (Studer, 1878) *''Acropora seriata'' (Ehrenberg, 1834) *''Acropora serrata'' Lamarck *''Acropora simplex'' Wallace and Wolstenholme, 1998 *''Acropora sirikitiae'' Wallace, Phongsuwan & Muir, 2012 *''Acropora slovenica''† Wallace & Bosselini, 2015 *''Acropora solanderi''† (Defrance, 1828) *''Acropora solitaryensis'' Veron and Wallace, 1984 *''Acropora sordiensis'' Riegl, 1995 *''Acropora spathulata'' (Brook, 1891) *''Acropora speciosa'' (Quelch, 1886) *''Acropora spicifera'' (Dana, 1846) *''Acropora squarrosa'' (Ehrenberg, 1834) *''Acropora striata'' (Verrill, 1866) *''Acropora subglabra'' (Brook, 1891) *''Acropora subulata'' (Dana, 1846) *''Acropora suharsonoi'' Wallace, 1994 *''Acropora sukarnoi'' Wallace, 1997 *''Acropora tanegashimensi'' -s Veron, 1990 *''Acropora tenella'' (Brook, 1892) *''Acropora tenuis'' (Dana, 1846) *''Acropora torihalimeda'' Wallace, 1994 *''Acropora tortuosa'' (Dana, 1846) *''Acropora tuberculosa'' (Milne Edwards, 1860) *''Acropora turaki'' Wallace, 1994 *''Acropora valenciennesi'' (Milne-Edwards and Haime, 1860) *''Acropora valida'' (Dana, 1846) *''Acropora variolosa'' (Klunzinger, 1879) *''Acropora vaughani'' Wells, 1954 *''Acropora verweyi'' Veron and Wallace, 1984 *''Acropora walindii'' Wallace, 1999 *''Acropora willisae'' Veron and Wallace, 1984 *''Acropora wilsonae''† Wallace, 2008 *''Acropora yongei'' Veron and Wallace, 1984

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