Machilidae

Distinguished from silverfish and firebrats (order Zygentoma, family Lepismatidae) by cylindrical rather than flattened body shape, humped thorax, and jumping ability. Distinguished from other Archaeognatha families by specific combinations of scale patterns, ocelli structure, and genital morphology; females possess prominent external ovipositor formed by elongate gonapophyses of abdominal segments VIII–IX.

Primarily terrestrial; found in moist, sheltered microhabitats including leaf litter, under stones, beneath loose bark, in rock crevices, and accumulations of organic detritus. Many species restricted to rocky shorelines, coastal cliffs, dunes, and scree slopes; others in forest floors, woodland margins, and well-vegetated inland habitats. Some taxa synanthropic on stone walls, rooftops, and other man-made substrates with suitable crevices and biofilm growth.

Nearly cosmopolitan; recorded from all biogeographic regions except Antarctica. Especially diverse in temperate and Mediterranean climates; occurs in montane and shaded environments in tropical regions. Present on continental landmasses and oceanic islands with endemic species.

Algae, lichens, and decaying plant material; scraping and grazing on biofilms using mandibulate mouthparts.

Virtually no metamorphosis (ametabolous development); nymphs resemble adults but are smaller and sexually immature. Growth through successive molts; molting continues after sexual maturity. Females possess external ovipositor for egg deposition.

Cursorial and saltatorial locomotion; capable of very rapid movement. When disturbed, escapes by jumping considerable distances using enlarged hind legs. Jumping mechanism involves tail beat with strong depression of posterior abdomen, swinging up anterior body; hind legs extend before middle legs in rocking motion, with jump duration approximately 30 milliseconds. Some species spin silken threads to guide females to spermatophores; others produce silken stalks for sperm droplet placement.

Herbivores and scavengers; contribute to decomposition of plant material and nutrient cycling in moist microhabitats. Serve as prey for various predators in rocky shoreline and forest floor ecosystems.

Generally inconspicuous and rarely abundant; occasional minor nuisance in synanthropic habitats. No significant economic or medical importance. Some species found on stone walls and rooftops.

• Lepismatidae (silverfish and firebrats)Both have three caudal filaments and scales, but Lepismatidae have flattened, torpedo-shaped bodies rather than cylindrical form; lack humped thorax and jumping ability; belong to order Zygentoma.
• Other Archaeognatha families (e.g., Meinertellidae)May share general body plan; distinguished by specific scale patterns, ocelli structure, maxillary palp segmentation, and genital morphology.

• Archaeognatha
• bristletails
• jumping bristletails
• wingless insects
• primitive insects
• rocky shorelines
• ametabolous development
• indirect sperm transfer
• jumping locomotion
• scavengers
• herbivores
• biofilm feeders

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Bug Eric: Silverfish and Firebrat
• The jump of Petrobius (Thysanura, Machilidae)
• A new species of bristletails of the genus Petrobiellus (Microcoryphia: Machilidae) from Sakhalin
• New data on the Fauna and ecology of the Bristletail Family Machilidae (Thysanura) from the Caucasus
• DISTRIBUTION AND RANGE STRUCTURE OF THE BRISTLETAIL GENUS <i>ALLOPSONTUS</i> SILV. (MACHILIDAE, MICROCORYPHIA)
• Six New Species of Genus Pedetontus Silvestri, 1911 (Microcoryphia: Machilidae), from Southern China.
• Morpho-Molecular Discordance and Cryptic Diversity in Jumping Bristletails: A Mitogenomic Analysis of Pedetontus silvestrii (Insecta: Archaeognatha: Machilidae).