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 ?
Sternorryncha, Symphyla and Thysanura presented higher correlation with the forest fragment in initial successional stage.
Distribution of the taxonomic groups of edaphic arthropods classified as "Other", in the forest fragments (FF) and in the areas of abandoned pasture (AP), Itaborai, RJ, Brazil Ecossistem Taxonomic group Archaeognatha, Auchenorryncha, Blattodea, Chilopoda, Diplopoda, Gastropoda, FF Heteroptera, Hymenoptera, Isopoda, Isoptera, Coleoptera larvae, Diptera larvae, Lepidoptera larvae , Neuroptera larvae, Neuroptera, Oligochaeta, Opilionida, Pseudoscorpionida, Psocoptera, Sternorryncha, Symphyla, Thysanoptera, Thysanura Auchenorryncha, Blattodea, Coleoptera, Diplopoda, Heteroptera, Hymenoptera, Isopoda, AP Isoptera, Coleoptera larvae, Diptera larvae, Lepidoptera larvae, Neuroptera larvae, Oligochaeta, Opilionida, Orthoptera, Sternorryncha, Symphyla, Thysanoptera, Thysanura Table 3.
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. Las pocas especies de Mollusca y Chordata fueron colectadas de manera accidental.
--., 1991.- Introduccion a los insectos sin alas (Protura, Diplura, Collembola, Thysanura): 1-23 (en) Manuales y guias para el estudio de microartropodos.
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.
Life history and biology of Ctenarytaina thysanura Ferris and Myver (Hemiptera: Psyllidae) on Boronia megastigma Nees ex Bard.
The remaining insects comprised three Hemiptera (Lygaeidae, Nabidae, Pyrrhocoridae), two Thysanura (Machilidae, Lepismatidae), two Collembola (Sminthuridae), one Psocoptera (unidentified), one Homoptera (Aphididae), one Embiomorpha (Oligotomidae: Haploembia solieri Ramb.) and one Lepidoptera larvae (Noctuidae).
Los autores insisten en el uso del nombre Microcoryphia en vez de Archaeognatha, siendo este ultimo al parecer mas util y de mayor uso; tambien emplean Thysanura en vez de Zygentoma, lo cual confunde el uso de Thysanura en los sentidos amplio (como grupo parafiletico) y estricto (excluyendo a los arqueognatos).