Alcyoniidae

Last updated

Alcyoniidae
Folded Coral Flynn Reef.jpg
Sarcophyton sp. on the Great Barrier Reef
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Cnidaria
Class: Octocorallia
Order: Alcyonacea
Suborder: Alcyoniina
Family: Alcyoniidae
Lamouroux, 1812
Genera
See text [1]
Synonyms [1]
  • Anthothelidae
  • Bellonelladae
  • Lobulariadae

Alcyoniidae is a family of leathery or soft corals in the phylum Cnidaria. [2]

Contents

Description

A colony of leathery coral is stiff, hard and inflexible. It is composed of tiny polyps projecting from a shared leathery tissue. Members of the family may have two kinds of polyps; the autozooids have long trunks and eight tiny branched tentacles and project from the shared leathery tissue while the siphonozooids remain below the surface and pump water for the colony. They appear as tiny hollows or mounds among the taller autozooids. Different genera have different proportions of these two kinds of polyps. The autozooids only emerge when the colony is fully submerged. [2]

Distribution and habitat

Leathery corals occur globally in temperate and tropical seas. They are often pioneer reef species and are found in wave-exposed areas of reef crests, less turbid waters in lagoons, on steep slopes, under overhangs and at depths of thirty metres or even deeper. [3]

Biology

Lobophyton sp. with extended polyps Lobophyton (soft coral) with extended polyps.jpg
Lobophyton sp. with extended polyps

Leathery coral polyps include endosymbiotic algae called zooxanthellae. The algae undergo photosynthesis and produce sugars from sunlight. This food is shared with the host, which itself provides the algae with minerals and shelter. Periodically, the surface layer of the leathery tissue is shed. This seems to be a mechanism for ridding the colony of unwanted algal growth. [2]

In a study on the Great Barrier Reef, it was found that the population of these corals was very stable. There was little predation, low rates of growth, reproduction and mortality, few new colonies came into existence and few disappeared over a three-year period. [3]

Genera

The following genera are recognized in the family Alcyoniidae: [1]

See also

Related Research Articles

<span class="mw-page-title-main">Coral</span> Marine invertebrates of the class Anthozoa

Corals are colonial marine invertebrates within the class Anthozoa of the phylum Cnidaria. They typically form compact colonies of many identical individual polyps. Coral species include the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton.

<span class="mw-page-title-main">Anthozoa</span> Class of cnidarians without a medusa stage

Anthozoa is a class of marine invertebrates which includes the sea anemones, stony corals and soft corals. Adult anthozoans are almost all attached to the seabed, while their larvae can disperse as part of the plankton. The basic unit of the adult is the polyp; this consists of a cylindrical column topped by a disc with a central mouth surrounded by tentacles. Sea anemones are mostly solitary, but the majority of corals are colonial, being formed by the budding of new polyps from an original, founding individual. Colonies are strengthened by calcium carbonate and other materials and take various massive, plate-like, bushy or leafy forms.

<span class="mw-page-title-main">Scleractinia</span> Order of Hexacorallia which produce a massive stony skeleton

Scleractinia, also called stony corals or hard corals, are marine animals in the phylum Cnidaria that build themselves a hard skeleton. The individual animals are known as polyps and have a cylindrical body crowned by an oral disc in which a mouth is fringed with tentacles. Although some species are solitary, most are colonial. The founding polyp settles and starts to secrete calcium carbonate to protect its soft body. Solitary corals can be as much as 25 cm (10 in) across but in colonial species the polyps are usually only a few millimetres in diameter. These polyps reproduce asexually by budding, but remain attached to each other, forming a multi-polyp colony of clones with a common skeleton, which may be up to several metres in diameter or height according to species.

<span class="mw-page-title-main">Alcyonacea</span> Order of octocorals that do not produce massive calcium carbonate skeletons

Alcyonacea are an order of sessile colonial cnidarians that are found throughout the oceans of the world, especially in the deep sea, polar waters, tropics and subtropics. Whilst not in a strict taxonomic sense, Alcyonacea are commonly known as soft corals. The term "soft coral" generally applies to organisms in the two orders Pennatulacea and Alcyonacea with their polyps embedded within a fleshy mass of coenenchymal tissue. Consequently, the term "gorgonian coral" is commonly handed to multiple species in the order Alcyonacea that produce a mineralized skeletal axis composed of calcite and the proteinaceous material gorgonin only and corresponds to only one of several families within the formally accepted taxon Gorgoniidae (Scleractinia). These can be found in order Malacalcyonacea (taxonomic synonyms of include : Alcyoniina, Holaxonia, Protoalcyonaria, Scleraxonia, and Stolonifera. They are sessile colonial cnidarians that are found throughout the oceans of the world, especially in the deep sea, polar waters, tropics and subtropics. Common names for subsets of this order are sea fans and sea whips; others are similar to the sea pens of related order Pennatulacea. Individual tiny polyps form colonies that are normally erect, flattened, branching, and reminiscent of a fan. Others may be whiplike, bushy, or even encrusting. A colony can be several feet high and across, but only a few inches thick. They may be brightly coloured, often purple, red, or yellow. Photosynthetic gorgonians can be successfully kept in captive aquaria.

<span class="mw-page-title-main">Octocorallia</span> Class of Anthozoa with 8-fold symmetry

Octocorallia is a class of Anthozoa comprising over 3,000 species of marine organisms formed of colonial polyps with 8-fold symmetry. It includes the blue coral, soft corals, sea pens, and gorgonians within three orders: Alcyonacea, Helioporacea, and Pennatulacea. These organisms have an internal skeleton secreted by mesoglea and polyps with eight tentacles and eight mesentaries. As with all Cnidarians these organisms have a complex life cycle including a motile phase when they are considered plankton and later characteristic sessile phase.

<i>Parazoanthus axinellae</i> Species of sea anemone

Parazoanthus axinellae, commonly known as the yellow cluster anemone, is a zoanthid coral found on the southern Atlantic coasts of Europe and in the Mediterranean Sea. Zoanthids differ from true sea anemones, in having a different internal anatomy and in forming true colonies in which the individual animals (polyps) are connected by a common tissue, called the coenenchyme.

<i>Alcyonium digitatum</i> Species of soft coral also known as dead mans fingers

Alcyonium digitatum or dead man's fingers is a species of soft coral in the family Alcyoniidae. It is found around the coasts of the northern Atlantic Ocean and other temperate waters such as the South Pacific.

<i>Alcyonium glomeratum</i> Species of coral

Alcyonium glomeratum or red sea fingers is a species of soft coral in the family Alcyoniidae. It is found around the southern and western coasts of Britain and Ireland.

<span class="mw-page-title-main">Purple soft coral</span> Species of coral

The purple soft coral is a species of colonial soft coral in the family Alcyoniidae.

The Valdivian soft coral is a species of colonial leathery or soft coral in the family Alcyoniidae.

<span class="mw-page-title-main">Variable soft coral</span> Species of soft coral

The variable soft coral is a species of colonial soft coral in the family Alcyoniidae.

<i>Alcyonium palmatum</i> Species of soft coral in the family Alcyoniidae commonly called red dead mans fingers

Alcyonium palmatum or red dead man's fingers is a species of soft coral in the family Alcyoniidae.

<i>Plexaurella nutans</i> Species of coral

Plexaurella nutans, the giant slit-pore sea rod, is a tall species of soft coral in the family Plexauridae. It is a relatively uncommon species and is found in shallow seas in the Caribbean region.

<i>Alcyonium acaule</i> Species of coral

Alcyonium acaule or Mediterranean sea-finger is a species of soft coral in the family Alcyoniidae. It is found at moderate depths on shaded rocks in the Mediterranean Sea and adjoining parts of the Atlantic Ocean.

<i>Alcyonium coralloides</i> Species of coral

Alcyonium coralloides, commonly known as false coral, is a colonial species of soft coral in the family Alcyoniidae. It is native to the northeastern Atlantic Ocean and the Mediterranean Sea. In the former location it generally grows as sheets or small lobes but in the latter it is parasitic and overgrows sea fans.

<i>Eunicella singularis</i> Species of coral

Eunicella singularis, the white gorgonian, is a species of colonial soft coral, a sea fan in the family Gorgoniidae. It is found in the western Mediterranean Sea, Adriatic Sea and Ionian Sea. It was first described in 1791 by the German naturalist Eugenius Johann Christoph Esper.

<i>Rhytisma fulvum</i> Species of coral

Rhytisma fulvum, the sulphur leather coral, is a species of colonial soft coral in the family Alcyoniidae. It is native to shallow reefs in the Red Sea and the Indo-Pacific region. It was first described by the Swedish naturalist Peter Forsskål in 1775.

<span class="mw-page-title-main">Euphylliidae</span> Family of marine coral known as Euphylliidae

Euphylliidae are known as a family of polyped stony corals under the order Scleractinia.

<i>Manicina areolata</i> Species of coral

Manicina areolata, commonly known as rose coral, is a colonial species of stony coral. It occurs in shallow water in the West Atlantic Ocean and Caribbean Sea, sometimes as small solid heads and sometimes as unattached cone-shaped forms.

<i>Oxypora glabra</i> Species of coral

Oxypora glabra is a species of large polyp stony coral in the family Lobophylliidae. It is a colonial coral with thin encrusting laminae. It is native to the central Indo-Pacific.

References

  1. 1 2 3 "WoRMS - World Register of Marine Species - Alcyoniidae Lamouroux, 1812". marinespecies.org. Retrieved 15 July 2024.
  2. 1 2 3 Leathery corals. Wildsingapore.com (2010-02-28). Retrieved on 2013-09-17.
  3. 1 2 Fabricius KE (1995). "Slow population turnover in the soft coral genera Sinularia and Sarcophyton on mid- and outer-shelf reefs of the Great Barrier Reef" (PDF). Marine Ecology Progress Series. 126: 145. doi: 10.3354/meps126145 .