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Millepora alcicornis
''Millepora alcicornis'', or sea ginger, is a species of colonial fire coral with a calcareous skeleton. It is found on shallow water coral reefs in the tropical west Atlantic Ocean. It shows a variety of different morphologies depending on its location. It feeds on plankton and derives part of its energy requirements from microalgae found within its tissues. It is an important member of the reef building community and subject to the same threats as other corals. It can cause painful stings to unwary divers.
==Taxonomy==
''Millepora alcicornis'' is not a true coral in class Anthozoa but is in class Hydrozoa, and is more closely related to jellyfish than stony corals. Because of the variability in growth habit that this coral exhibits, it has been the subject of much confusion as to its taxonomy, being described under a number of different names from different localities. In 1898, Hickson decided that the variations in morphology were due to environmental factors and that ''Millepora alcicornis'' was the valid name for all these species. This conclusion has since been questioned.
The species was first described by Linnaeus in 1758, but his type locality is unknown.〔 The scientific name comes from the Latin with ''Millepora'' meaning "thousand-pored" and ''alcicornis'' meaning "elk-horned". It seems likely that the type locality is in fact the West Indies. Explaining this in 1941 Crossland wrote "I cannot resist the remark that the one thing quite certain about the many forms of ''Millepora'' is that none of them have any resemblance to an elk's horn, except perhaps that from the West Indies".〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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