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This family is erected for the anomalous genus Merothrips Hood, which contains the single North American species morgani. In structure it is intermediate in many respects between the Tubulifera and Terebrantia/ and in habitat is very suggestive of the former. As only one genus cind species is known, it seems best not to attempt a definition of the family, but rather to emphasize the most striking characteristics, which are as follows :
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John Douglas (1914) studied this question.
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