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''Halimeda'' is a genus of green macroalgae. The algal body (thallus) is composed of calcified green segments. Calcium carbonate is deposited in its tissues, making it inedible to most herbivores. As in other members of the order Bryopsidales, individual organisms are made up of single multi-nucleate cells. Whole meadows may consist of a single individual alga connected by fine threads running through the substrate.〔(The Cell Biology of the Bryopsidales )〕 ''Halimeda'' is responsible for distinctive circular deposits in various parts of the Great Barrier Reef on the north-east coast of Queensland, Australia. ''Halimeda'' beds form in the western or lee side of outer shield reefs where flow of nutrient-rich water from the open sea allows them to flourish, and are the most extensive, actively accumulating ''Halimeda'' beds in the world. The genus is one of the best studied examples of cryptic species pairs due to morphological convergence within the marine macroalgae. 〔Kooistra W.H.C.F., Coppejans E.G.G. & Payri C. (2002). Molecular systematics, historical ecology, and phylogeography of ''Halimeda''. (Bryopsidales) ''Molecular Phylogenetics and Evolution'' 24: 121–138〕 〔Verbruggen H., De Clerck O., Kooistra W.H.C.F. & Coppejans E. (2005). Molecular and morphometric data pinpoint species boundaries in ''Halimeda'' section ''Rhipsalis'' (Bryopsidales, Chlorophyta). ''Journal of Phycology'' 41: 606-621〕 〔Verbruggen H., De Clerck O., Schils T., Kooistra W.H.C.F. & Coppejans E. (2005). Evolution and phylogeography of ''Halimeda'' section ''Halimeda''. ''Molecular Phylogenetics and Evolution'' 37: 789-803〕 ==Species== * ''H. bikinensis'' * ''H. borneensis'' * ''H. cereidesmis'' * ''H. copiosa'' * ''H. cryptica'' * ''H. cuneata'' * ''H. cylindracea'' * ''H. discoidea'' * ''H. distorta'' * ''H. favulosa'' * ''H. fragilis'' * ''H. gigas'' * ''H. goreauii'' * ''H. gracilis'' * ''H. heteromorpha'' * ''H. howensis'' * ''H. hummii'' * ''H. incrassata'' * ''H. kanaloana'' * ''H. lacrimosa'' * ''H. lacunalis'' * ''H. macroloba'' * ''H. macrophysa'' * ''H. magnidisca'' * ''H. melanesica'' * ''H. micronesica'' * ''H. minima'' * ''H. monile'' * ''H. opuntia'' * ''H. pumila'' * ''H. pygmaea'' * ''H. renschii'' * ''H. scabra'' * ''H. simulans'' * ''H. stuposa'' * ''H. taenicola'' * ''H. tuna'' * ''H. velasquezii'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Halimeda」の詳細全文を読む スポンサード リンク
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