Grooved brain coral, Caribbean Sea , Vieques, Puerto Rico This species of reef -building coral has a hemispherical, brain-like shape with a brown, yellow, or gray colour. These polyp -bearing valleys are each separated by grooved ambulacral ridges. There may be a difference in colour between the valleys and the grooves. During its planktonic larval stage, the coral has locomotion. After that time, it becomes permanently sessile. These are captured by the polyps, by extruding mesenterial filaments and tentacles.
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Glossary Atlantic Ocean the body of water between Africa, Europe, the southern ocean above 60 degrees south latitude , and the western hemisphere.
It is the second largest ocean in the world after the Pacific Ocean. More specifically refers to a group of organisms in which members act as specialized subunits a continuous, modular society - as in clonal organisms. Ecotourism implies that there are existing programs that profit from the appreciation of natural areas or animals. In insects, "incomplete metamorphosis" is when young animals are similar to adults and change gradually into the adult form, and "complete metamorphosis" is when there is a profound change between larval and adult forms.
Butterflies have complete metamorphosis, grasshoppers have incomplete metamorphosis. Examples are cnidarians Phylum Cnidaria, jellyfish, anemones, and corals. Coral reefs are found in warm, shallow oceans with low nutrient availability.
They form the basis for rich communities of other invertebrates, plants, fish, and protists. The polyps live only on the reef surface. Because they depend on symbiotic photosynthetic algae, zooxanthellae, they cannot live where light does not penetrate.
Attached to substratum and moving little or not at all. Synapomorphy of the Anthozoa sexual reproduction that includes combining the genetic contribution of two individuals, a male and a female solitary.
Caribbean Coral Diaries: Diploria labyrinthiformis
The grooved brain coral grows into large hemispherical colonies and has wide valleys that twist and turn their way throughout the colony. Diploria labyrinthiformis Grooved Brain Coral The wide valleys have a groove in the center which varies greatly in width and depth between colonies. Coral polyps can be seen in the deep narrow valleys between the grooved ridges. Diploria clivosa, Knobby Brain Coral. Diploria strigosa, Symmetrical Brain Coral 3.
Description[ edit ] Close up view of ridges and valleys on the surface of the coral The symmetrical brain coral forms smooth flat plates or massive hemispherical domes up to 1. The surface is covered with interlinking convoluted valleys in which the polyps sit in cup-shaped depressions known as corallites. Each of these has a number of radially arranged ridges known as septa which continue outside the corallite as costae and link with those of neighbouring corallites. The ridges separating the valleys are smoothly rounded and do not usually have a groove running along their apex as does the rather similar grooved brain coral Diploria labyrinthiformis. The coral has symbiotic dinoflagellate alga called zooxanthella in its tissues and it is these which give the coral its colour of yellowish or greenish brown, or occasionally blue-grey. The valleys are often a paler or contrasting colour. It is probably the most widespread of the brain corals and not only occurs on reefs but also sometimes on muddy stretches of seabed where not many other corals flourish.