Apterygota is a subclass of insects that are small agile insects, distinguised from other insects by their lack of wings now and in their evolutionary history. Their first known occurrence in the fossil record is in the Devonian period, 417-354 million years ago. Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria (coral, jellyfish, anenomes) Placozoa (trichoplax) Subregnum Bilateria (bilateral symmetry) Acoelomorpha (basal) Orthonectida (flatworms, echinoderms, etc. ... Subphyla and Classes Subphylum Trilobitomorpha Trilobita - Trilobites (extinct) Subphylum Chelicerata Arachnida - Spiders, Scorpions, etc. ... Classes & Orders Subclass: Apterygota Orders Archaeognatha (Bristletails) Thysanura (Silverfish) Monura - extinct Subclass: Pterygota Infraclass: Paleoptera (paraphyletic) Orders Ephemeroptera (mayflies) Protodonata - extinct Odonata (dragonflies and damselflies) Diaphanopteroidea - extinct Palaeodictyoptera - extinct Megasecoptera - extinct Archodonata - extinct Infraclass: Neoptera Orders Blattodea (cockroaches) Isoptera (termites) Mantodea (mantids) Dermaptera (earwigs) Plecoptera (stoneflies) Protorthoptera - extinct Orthoptera (grasshoppers... Families Machilidae Meinertellidae The Archaeognatha are known as the bristletails, so named because of their three-pronged tails. ... Families Lepidotrichidae Lepismatidae Maindroniidae Nicoletiidae Silverfish was also the name of a Scottish indie rock band. ... In object-oriented programming, subclass is a class that is derived from another class or classes. ... Classes & Orders Subclass: Apterygota Orders Archaeognatha (Bristletails) Thysanura (Silverfish) Monura - extinct Subclass: Pterygota Infraclass: Paleoptera (paraphyletic) Orders Ephemeroptera (mayflies) Protodonata - extinct Odonata (dragonflies and damselflies) Diaphanopteroidea - extinct Palaeodictyoptera - extinct Megasecoptera - extinct Archodonata - extinct Infraclass: Neoptera Orders Blattodea (cockroaches) Isoptera (termites) Mantodea (mantids) Dermaptera (earwigs) Plecoptera (stoneflies) Protorthoptera - extinct Orthoptera (grasshoppers... Disambiguation: Devonian is also an adjective relating to the English county of Devon or the people there. ...
The younger stages (nymphs) go through little or even no metamorphosis, so they reseble the adult specimens. Their skin is thin, making them translucent. In biology, a nymph is the immature form of some insect species (e. ... Metamorphosis in a process in biology by which individual physically develops after birth or hatching involving significant change in form as well as growth and differentiation. ...
There are no current species at conservation risk.
Sources
Firefly Encyclopedia of Insects and Spiders, edited by Christopher O'Toole, ISBN 1-55297-612-2, 2002
Some Apterygota have traces of abdominal legs; spine-like appendages, attached to the hinder margins of some of the abdominal segments beneath and called styli, may also be present.
Bringing together these facts, the Apterygota may be characterized as Wingless insects having the mouth-parts either exposed and of the chewing type or almost entirely concealed by folds of the cheeks, where they are often slender and probably used for piercing and sucking.
Very few of the Apterygota are of any importance from an economic standpoint, but they are of much interest, being the simplest insects known and throwing some light upon the subject of the ancestry of the insect group.
Janetschek (1969) is of the opinion that, in Apterygota, entognathy is realised after different schemes so it should be interpreted as the result of the parallel but independent evolution of the several groups of Apterygota; the polyphyletic appearence of entognathy in Pterygota seems to support this opinion (cited from Dallai, 1974:148).
Apterygota is considered as being an artificial assemblage of paraphyletic taxa (Moen and Ellis, 1984).
The Apterygota are not found to compose a natural group among the hexapods, based on a cladistic analysis of external and internal anatomy characters (Bitsch and Bitsch, 2000:153).
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