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<p>he&nbsp;<em>Aleyrodidae</em>&nbsp;are a family in the suborder&nbsp;<em><a href="https://en.wikipedia.org/wiki/Sternorrhyncha">Sternorrhyncha</a></em>&nbsp;and at present comprise the entire superfamily Aleyrodoidea, related to the superfamily&nbsp;<a href="https://en.wikipedia.org/wiki/Psylloidea">Psylloidea</a>. The family often occurs in older literature as "Aleurodidae",<sup><a href="https://en.wikipedia.org/wiki/Whitefly#cite_note-isbn0-412-61390-5-2">[2]</a></sup>&nbsp;but that is a junior synonym and accordingly incorrect in terms of the international standards for zoological nomenclature.<sup><a href="https://en.wikipedia.org/wiki/Whitefly#cite_note-3">[3]</a></sup></p>
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<p><em>Aleyrodidae</em>&nbsp;are small insects, most species with a wingspan of less than 3&nbsp;mm and a body length of 1&nbsp;mm to 2mm. Many are so small that their size complicates their control in greenhouses because they can only be excluded by screening with very fine mesh; in fact they can enter mesh so fine that many of their natural enemies cannot come in after them, so that unchecked whitefly populations in greenhouses rapidly become overwhelming. Some "giant whitefly" species exist, some of which may exceed 5&nbsp;mm in size. This sometimes is associated with sexual dimorphism in which one sex is markedly larger than the other. Such dimorphism is common in the Sternorrhyncha, in which the males of most scale insects for example are tiny compared to the female. Remarkably however, in some giant tropical species the males are much larger than the females.<sup><a href="https://en.wikipedia.org/wiki/Whitefly#cite_note-MJH-4">[4]</a></sup></p>
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