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The coral is densely branched but usually grows in a single plane. The colour varies and is usually some shade of red, orange or deep yellow but purple specimens occasionally occur. The skeleton is not rigid so the whole fan-like structure can sway with the movement of the surrounding water.
Cryptochiridae is a family of crabs known commonly as gall crabs or coral gall crabs. They live inside dwellings in corals and cause the formation of galls in the coral structure. [1] [2] The family is currently placed in its own superfamily, Cryptochiroidea. Gall crabs are sexually dimorphic, with males being much smaller than females ...
Several species of coral-inhabiting barnacles are associated with Astreopora. In fact, Hiroa stubbingsi and two species of Cionophorus seem to occur nowhere else. In the case of H. stubbingsi , which has a primitive wall and a relatively unspecialised operculum , this may be because it is not equipped to occupy other corals, but the Cionophorus ...
The coral grows from a small base, forming several main branches with side branches and a network of small branchlets. The Venus sea fan is similar in appearance to Gorgonia ventalina , but has a slightly more untidy shape and short, stubby side growths coming out of the main plane. [ 3 ]
Acroporidae is a family of small polyped stony corals in the phylum Cnidaria.The name is derived from the Greek "akron" meaning "summit" and refers to the presence of a corallite at the tip of each branch of coral. [3]
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.
A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarinata. [1] Such stones were formed as a result of glaciation, in which sheets of ice plucked stones from the bedrock, grinding off their rough edges and depositing them in the northwestern (and some in the northeastern) portion of Michigan's lower peninsula.
Members of the family Melithaeidae are arborescent colonial corals forming fans, bushes or trees. The axis or main skeletal "trunk" is jointed, there being nodes, flexible horny joints, separated by internodes composed of hard, calcareous material.
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