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G. ventalina is a fan-shaped colonial coral with several main branches and a latticework of linking smaller branches. The skeleton is composed of calcite and gorgonin, a collagen-like compound. The calyces in which the polyps are embedded are in two rows along the branches.
Coral species include the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton. A coral "group" is a colony of very many genetically identical polyps. Each polyp is a sac-like animal typically only a few millimeters in diameter and a few centimeters in height.
"Tetracorallia" from Ernst Haeckel's Kunstformen der Natur, 1904 Cross-section of Stereolasma rectum, a rugose coral from the Middle Devonian of Erie County, New York. The Rugosa, also called the Tetracorallia, rugose corals, or horn corals, are an extinct order of solitary and colonial corals that were abundant in Middle Ordovician to Late Permian seas.
Meandering corallite walls of an intratentacular budding coral Separate corallites of an extratentacular budding species. In colonial corals, growth results from the budding of new polyps. There are two types of budding, intratentacular and extratentacular. In intratentacular budding, a new polyp develops on the oral disc, inside the ring of ...
Acropora secale is a colonial coral that forms low hummocks. The branches can grow to a diameter of 20 mm (0.8 in) and length of 70 millimetres (2.8 in). They are cylindrical but gradually taper towards the tips. They grow in a corymbose fashion with the lower branches being longer than the upper ones so that the coral has a level-topped ...
Gersemia rubiformis is a colonial coral that grows in the form of knobbly clumps. The colonies are erect and branch from one main stalk. The polyps are concentrated near the ends of the narrower terminal branches and are non-retractile in their calyces. The branches are not rigid but are stiffened by the presence of sclerites, and can sway ...
Dichocoenia stokesi is a massive colonial coral that forms rounded humps up to 40 centimetres (16 in) in diameter or thick plates. It is recognisable by the fact that many of the corallites, the stony cups from which the coral polyps protrude, can be oval, or elongated. They can be up to 5 centimetres (2.0 in) long and only 0.5 centimetres (0. ...
Tabulata, commonly known as tabulate corals, are an order of extinct forms of coral. They are almost always colonial, forming colonies of individual hexagonal cells known as corallites defined by a skeleton of calcite, similar in appearance to a honeycomb. Adjacent cells are joined by small pores.
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