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Apterygota are a subclass of small, agile insects, distinguished from other insects by their lack of wings in the present and in their evolutionary history. They include Thysanura (silverfish and firebrats). Some species lacking wings are members of insect orders that generally do have wings. Some do not grow wings at all, having "lost" the ...
External parasites of adults and nymphs include mites. [50] Female grasshoppers parasitised by mites produce fewer eggs and thus have fewer offspring than unaffected individuals. [51] Grasshopper with parasitic mites. The grasshopper nematode (Mermis nigrescens) is a long slender worm that infects grasshoppers, living in the insects' hemocoel.
Louse (pl.: lice) is the common name for any member of the clade Phthiraptera, which contains nearly 5,000 species of wingless parasitic insects. Phthiraptera has variously been recognized as an order, infraorder, or a parvorder, as a result of developments in phylogenetic research. [1][2][3] Lice are obligate parasites, living externally on ...
The name Apterygota is sometimes applied to a former subclass of small, agile insects, distinguished from other insects by their lack of wings in the present and in their evolutionary history; notable examples are the silverfish, the firebrat, and the jumping bristletails. Their first known occurrence in the fossil record is during the Devonian ...
Fairyflies are very tiny insects, like most chalcidoid wasps, mostly ranging from 0.5 to 1.0 mm (0.020 to 0.039 in) long. They include the world's smallest known insect, with a body length of only 0.139 mm (0.0055 in), and the smallest known flying insect, only 0.15 mm (0.0059 in) long. They usually have nonmetallic black, brown, or yellow bodies.
Pediculus humanus capitis by Des Helmore. The head louse (Pediculus humanus capitis) is an obligate ectoparasite of humans. [ 1 ] Head lice are wingless insects that spend their entire lives on the human scalp and feed exclusively on human blood. [ 1 ] Humans are the only known hosts of this specific parasite, while chimpanzees and bonobos host ...
Strepsiptera were once believed to be the sister group to the beetle families Meloidae and Ripiphoridae, which have similar parasitic development and forewing reduction. Early molecular research suggested their inclusion as a sister group to the flies , [ 1 ] in a clade called Halteria, [ 22 ] which have one pair of the wings modified into ...
Insect wing. Insect wings are adult outgrowths of the insect exoskeleton that enable insects to fly. They are found on the second and third thoracic segments (the mesothorax and metathorax), and the two pairs are often referred to as the forewings and hindwings, respectively, though a few insects lack hindwings, even rudiments.