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Brood XXII : ウィキペディア英語版
Brood XXII
Brood XXII (also known as The Baton Rouge Brood) is a brood of 13-year periodical cicadas, last seen in 2014 in a geographic region centered on Baton Rouge, LA as well as other locations in Southeast Louisiana and Southwest Mississippi. Periodical cicadas (''Magicicada spp.'') are often referred to as "17-year locusts" because most of the known distinct broods have a 17-year life cycle. Brood XXII is one of only three surviving broods with a 13-year cycle. The next emergence of The Baton Rouge Brood is expected in 2027.
==Position among other broods of cicadas==
(詳細はeggs, and then dies off in several weeks.
In 1907, entomologist C. L. Marlatt postulated the existence of 30 different broods of periodical cicadas: 17 distinct broods with a 17-year life cycle, to which he assigned Roman numerals I through XVII (with emerging years 1893 through 1909); plus 13 broods with a 13-year cycle, to which he assigned Roman numerals XVIII through XXX (1893 through 1905). Many of these hypothetical broods, however, have not been observed. Today only 15 are recognized.
Brood XXII is one of three extant broods of 13-year cicadas. The other two are Broods XIX and XXIII, expected to re-emerge in 2024 and 2015 respectively.〔(【引用サイトリンク】url=http://www.magicicada.org/about/brood_pages/broods.php )〕 A fourth 13-year brood, Brood XXI (The Floridian Brood) was last recorded in 1870 in the Florida panhandle, but is believed to be now extinct.〔(【引用サイトリンク】url=http://www.magicicada.org/about/brood_pages/broodXXI.php )

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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