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Daphnia
''Daphnia'', a genus of small planktonic crustaceans, are in length. ''Daphnia'' are members of the order Cladocera, and are one of the several small aquatic crustaceans commonly called water fleas because their saltatory() swimming style resembles the movements of fleas. ''Daphnia'' live in various aquatic environments ranging from acidic swamps to freshwater lakes, ponds, streams and rivers.
The two most readily available species of ''Daphnia'' are ''D. pulex'' (small and most common) and ''D. magna'' (large). They are often associated with a related genus in the order Cladocera: ''Moina'', which is in the Moinidae family instead of Daphniidae and is much smaller than ''D. pulex'' (approximately half the maximum length). ''Daphnia'' eggs for sale are generally enclosed in ''ephippia'' (a thick shell, consisting of two chitinous plates, that encloses and protects the winter eggs of a cladoceran).
== Appearance and characteristics ==
The body of ''Daphnia'' is usually long, and is divided into segments, although this division is not visible. The head is fused, and is generally bent down towards the body with a visible notch separating the two. In most species, the rest of the body is covered by a carapace, with a ventral gap in which the five or six pairs of legs lie.〔 The most prominent features are the compound eyes, the second antennae, and a pair of abdominal setae.〔 In many species, the carapace is translucent or nearly so and as a result they make excellent subjects for the microscope as one can observe the beating heart.〔
Even under relatively low-power microscopy, the feeding mechanism can be observed, with immature young moving in the brood pouch; moreover, the eye being moved by the ciliary muscles can be seen, as well as blood cells being pumped around the circulatory system by the simple heart.〔 The heart is at the top of the back, just behind the head, and the average heart rate is approximately 180 bpm under normal conditions. ''Daphnia'', like many animals, are prone to alcohol intoxication, and make excellent subjects for studying the effects of the depressant on the nervous system due to the translucent exoskeleton and the visibly altered heart rate. They are tolerant of being observed live under a cover slip and appear to suffer no harm when returned to open water.〔 This experiment can also be performed using caffeine, nicotine or adrenaline, each producing an increase in the heart rate.〔
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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