Thysanura


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Thysanura

[‚thī·sə′nu̇r·ə]
(invertebrate zoology)
The silverfish, machilids, and allies, an order of primarily wingless insects with soft, fusiform bodies.

Thysanura

 

the order of primitive wingless insects most closely related to winged insects in regard to their development. The spindle-shaped body is usually covered with thin, shiny scales and in some cases is naked. It measures 10–20 mm in length. The insects have long, filamentous antennae, a mouth apparatus of the chewing type, and two compound eyes with two to three simple occelli between them. The thorax is continuous with the 11-segmented abdomen, which ends in a long, segmented axial filament and paired cerci. Fertilization is external and internal.

The order embraces approximately 360 species, which are encountered on all continents, predominantly in warm areas. The Thysanura live under rocks, in rock crevices, and in plant remains. The USSR has about ten species, including the silverfish. The insects have not been studied thoroughly.

Certain more primitive insects bearing a superficial resemblance to the Thysanura have been assigned to an independent order, Archeognatha, which was earlier considered the suborder Machiloidea of Thysanura. There are about 220 species of Archeognatha, fewer than ten of which inhabit the USSR.

References in periodicals archive ?
Microcoryphia Machilidae Thermobia domestica Thysanura Lepismatidae Lespisma saccharina Orthoptera Gryllacrididae Ceuthophilus sp.
The new word describes thysanoures, insects of the order Thysanura, some of which, like Atelura formicaria, live in anthills and steal the food collected by the ants, while others, like the silver-fish (lepisma domestica, lepisme in French) use books for corporal rather than spiritual food.
Los insectos fueron el grupo mas rico en especies y estuvieron representados por once ordenes: Blattodea, Coleoptera, Dermaptera, Diptera, Hemiptera, Hymenoptera, Lepidoptera, Neuroptera, Orthoptera, Trichoptera y Thysanura.
Copula durations of roughly 30-40 min have been reported in Ctenarytaina thysanura Ferris and Klyver (Mensah & Madden 1993) and the pear psylla (Burts & Fischer 1967), whereas mean copula duration in T.