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Leptodora
''Leptodora'' is a genus containing two species of large, nearly transparent predatory water fleas. They grow up to long, with two large antennae used for swimming and a single compound eye. The legs are used to catch copepods that it comes into contact with by chance. ''Leptodora kindtii'' is found in temperate lakes across the Northern Hemisphere and is probably the only cladoceran ever described in a newspaper; ''L. richardi'' is only known from eastern Russia. For most of the year, ''Leptodora'' reproduces parthenogenetically, with males only appearing late in the season, to produce winter eggs which hatch the following spring. ''Leptodora'' is the only genus in its family, the Leptodoridae, and suborder, Haplopoda.
==Description==
Adults of ''Leptodora'' are the largest planktonic cladocerans native to North America;〔(【引用サイトリンク】title=''Leptodora kindti'' )〕 reports vary concerning the largest size, but adult females typically grow to long, but with some reports of females up to .〔 They are about 98% transparent, as a defense against predation by fish. Lilljeborg notes:〔
The female is transparent to such a high degree, literally "as clear as water", that her presence is often only given away by her movements. In bright sunlight, the shadow is normally seen before the animal itself.
The male is similarly transparent.〔 The abdomen is elongated, but the carapace is small and only covers the brood pouch.〔
The five pairs of thoracic appendages form a "feeding basket" which is used to capture prey. The second antennae are used for swimming, while the first antennae are rudimentary in females but elongated in males, where they are used in sexual reproduction.〔 There is a single large compound eye which takes up much of the animal's head.〔 It comprises around 500 facets, which are spherically arranged, and the whole eye is movable by up to 10° in any direction.
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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