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triops
''Triops'' is a genus of small crustaceans in the order Notostraca (tadpole shrimp). Some species are considered living fossils, with a fossil record that reaches back to the late Carboniferous, . One species, ''Triops longicaudatus'', is commonly sold in kits as a pet.
==Relatives and fossil record==
The genus ''Triops'' can be distinguished from the only other genus of Notostraca, ''Lepidurus'', by the form of the telson (its 'tail'), which bears only a pair of long, thin caudal extensions in ''Triops'', while ''Lepidurus'' also bears a central platelike process. Only 24 hours after hatching they already resemble miniature versions of the adult form.
''Triops'' are sometimes called "living fossils," since fossils attributable to this genus have been found in rocks of Carboniferous age, an estimated , and one extant species, ''Triops cancriformis'', has hardly changed since the Jurassic period (approximately ).
Triops can be found in Australia, Asia, South America, Great Britain, and in some parts of North America where the climate is right. Some eggs stay unhatched from the previous group and hatch when rain soaks the area. Triops are fond of dirty, warm water filled with bacteria, of which they eat.
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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