The Archaeognatha are known as the bristletails, so named because of their three-pronged tails. An alternate name is the Microcoryphia from micro, small and coryphia, head. They are among the least evolutionarily changed insects, appearing in the Devonian period along with the Arachnids. The name Archaeognatha is derived from Greek. Archaeos meaning ancient is combined with gnatha meaning jaw. There are approximately 350 species in the two families. They are distributed worldwide, and unusual in the insect world in that they can even be found in the Arctic where they live in leaf litter and rock crevices. Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria Placozoa Subregnum Bilateria Acoelomorpha Orthonectida Rhombozoa Myxozoa Superphylum Deuterostomia Chordata (vertebrates, etc. ... Subphyla and Classes Subphylum Trilobitomorpha Trilobita - Trilobites (extinct) Subphylum Chelicerata Arachnida - Spiders, Scorpions, etc. ... Orders Subclass Apterygota Symphypleona - globular springtails Subclass Archaeognatha (jumping bristletails) Subclass Dicondylia Monura - extinct Thysanura (common bristletails) Subclass Pterygota Diaphanopteroidea - extinct Palaeodictyoptera - extinct Megasecoptera - extinct Archodonata - extinct Ephemeroptera (mayflies) Odonata (dragonflies and damselflies) Infraclass Neoptera Blattodea (cockroaches) Mantodea (mantids) Isoptera (termites) Zoraptera Grylloblattodea Dermaptera (earwigs) Plecoptera (stoneflies) Orthoptera (grasshoppers, crickets...-1... The Devonian is a major division of the geologic timescale that extends from the end of the Silurian period (360 million years ago (mya)) to the beginning of the Mississippian subperiod of the Carboniferous (408. ... Orders Acarina Amblypygi Araneae Opiliones Palpigradi Pseudoscorpionida Ricinulei Schizomida Scorpiones Solifugae Uropygi ArachNIDS (Advanced Reference Archive of Current Heuristics for Network Intrusion Detection Systems) Developed by Max Visions White Hats, ArachNIDS is an attack profile database used to dynamically create signatures which are compatible with various Network IDS. The... The red line indicates the 10°C isotherm in July, commonly used to define the Arctic region border The Arctic is the area around the Earths North Pole. ...
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
External links
Archaeognatha - Tree of Life Web Project]
Microcoryphia Virginia Polytechnic Institute and State College Department of Entomology
However, there is little evidence that this fossil is a member of Archaeognatha; it may instead be a member of the stem-group of insects or of stem-Dicondylia.
Morphology and classification of the extinct Archaeognatha and related taxa (Hexapoda).
Archaeognatha (Insecta) from the Krakatau Islands and the Sunda Strait area, Indonesia.
In insects, it contains most of the digestive tract, respiratory system, and circulatory system, and the apical segments are typically modified to form genitalia.
In a few of the most primitive insects (the Archaeognatha), the metasomal segments bear small, articulated appendages called "styli", which are often considered to be vestigial.
There are also pre-apical appendages in most insect orders, called cerci, which may be multi-segmented and almost resembling a posterior pair of antennae; these may be variously modified, or lost entirely.
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