Lepisma

Distinguished from other Zygentoma by the combination of three well-developed caudal filaments (often broken in preserved specimens), long antennae, and scaly body covering. The common silverfish (L. saccharina) can be separated from the four-lined silverfish (Ctenolepisma lineata) by the presence of four dark lines running lengthwise on the latter. Firebrat (Thermobia domestica) prefers warmer, drier habitats. Accurate identification to species level requires examination of scale patterns and body proportions.

Damp, dark environments with high humidity. Found in crevices, under rocks, in leaf litter, caves, and ant nests in natural settings. In human habitations, occupies basements, bathrooms, kitchens, libraries, and museums—anywhere with moisture and food sources.

Cosmopolitan distribution due to human transport. Naturally occurring populations found across multiple continents; specific native range difficult to determine due to long association with humans.

Active year-round in suitable conditions. Nocturnal, hiding in crevices during daylight hours.

Feeds on materials high in starches, cellulose, and proteins. Documented consumption includes: paper and bookbinding paste, wallpaper glue, starch in clothing (particularly silk and rayon), oatmeal, damp wheat flour, cereals, and carbohydrates generally. Laboratory studies show temperature-dependent nutrient self-selection, with carbohydrate preference decreasing and protein/lipid consumption increasing at higher temperatures.

Undergoes incomplete metamorphosis (ametabolous development). Young resemble adults but are smaller and sexually immature. Molts repeatedly throughout life—at least 40 molts recorded in laboratory specimens over 2.5 years. Lifespan exceeds two years under laboratory conditions. Eggs laid singly or in small batches in cracks and crevices.

Nocturnal, hiding in dark crevices during day. Rapid escape running when disturbed, comparable in speed to cockroaches. Forms aggregations mediated by species-specific contact pheromones; arrestment behavior requires physical contact with pheromone source. Mating involves male deposition of spermatophore and use of silk strands from mouthpart glands to loosely restrain female, facilitating spermatophore uptake. Does not respond to pheromones of related species Ctenolepisma longicaudata or Thermobia domestica.

Decomposer in natural habitats, breaking down plant detritus and organic matter. In human environments, acts as a pest of stored materials.

Household pest in libraries, museums, archives, and residences. Damages books, wallpaper, clothing, and stored food products. Rarely abundant enough to cause major economic damage; generally considered a nuisance pest. Presence often indicates damp conditions that may require structural attention.

• Ctenolepisma lineataFour-lined silverfish; distinguished by four dark longitudinal stripes on body, prefers drier conditions than L. saccharina
• Thermobia domesticaFirebrat; prefers warm, dry habitats such as around furnaces and pipe insulation, body coloration more mottled

• primitive insects
• wingless
• household pest
• silverfish
• ametabolous development
• contact pheromones
• nocturnal

• BugGuide
• Wikipedia
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Bugs and Beat: Talented UC Davis Graduate Students Form Insect-Themed Band | Bug Squad
• Bug Eric: Silverfish and Firebrat
• North America’s most “extreme” jewel beetle | Beetles In The Bush
• biography | Beetles In The Bush
• Silverfish Lepisma saccharina Linnaeus (Insecta: Zygentoma: Lepismatidae)
• Pheromone-based Arrestment Behavior in the Common Silverfish, Lepisma saccharina, and Giant Silverfish, Ctenolepisma longicaudata
• Effects of temperature on nutrient self‐selection in the silverfish Lepisma saccharina
• Morphological and molecular revision of the subfamily Heterolepismatinae (Zygentoma, Lepismatidae), with descriptions of two new genera from the Atacama Desert, Chile.