Synonyms and other taxonomic changes
The name Microcoryphia
was proposed by Verhoeff on April 22, 1904; Borner proposed the name Archaeognatha 11 days later
Explanation of Names
Greek mikros 'small' + koryphe 'head'
22 spp. in 12 genera of 2 families in our area(1)
, ~about 350 spp. worldwide
wingless; body cylindrical, brownish or yellowish with darker mottling or irregular pattern; thorax arched dorsally; tip of abdomen with 1 long medial filament and 2 shorter lateral cerci; long thread-like antennae with many segments; eyes large and meet in middle; mandibles articulate at one point only; short lateral styli (rudimentary appendages) on abdominal segments 2-9; able to jump up to 10 cm by snapping abdomen against ground
outdoor grassy or wooded environments: under bark, in leaf litter, rock crevices, or under stones; not normally found in homes, does not breed indoors, and not considered a pest
algae, lichen, moss, decaying vegetation; usually feed at night
Sexual maturity is reached after at least eight juvenile instars spanning up to two years. Molting continues periodically even after adulthood. The sexes are separate, but copulation does not occur. Males produce a packet of sperm (spermatophore) and leave it on the ground to be picked up by a female. Females cannot store sperm (they lack a spermatheca), and evidently acquire a new spermatophore before each bout of egglaying. Eggs are laid singly or in small groups (less than 30). Some species have elaborate courtship rituals to insure that females are able to locate a spermatophore. (Meyer 2005)
The name Thysanura (previously spelled Thysanoura, and originally Thysanoures in French) has been used at various times to refer to various groups of organisms. It originally included springtails, diplurans, bristletails, and silverfish, but has subsequently been used to refer to only 3, 2, or 1 of these groups. There are other accepted names for each of these groups, so in order to avoid confusion over what is meant by "Thysanura", many recent authors have chosen to discontinue its use.
(See Thysanura & Thysanoura
, N.J. Kluge, St. Petersburg State U., Russia)
: compound eyes are small or absent and do not touch; body is flattened; mandibles articulate at two points; often found in homes and run quickly but cannot jump.