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Lepidotrichidae is a family of basal
Basal (phylogenetics)
In phylogenetics, a basal clade is the earliest clade to branch in a larger clade; it appears at the base of a cladogram.A basal group forms an outgroup to the rest of the clade, such as in the following example:...

Insects are a class of living creatures within the arthropods that have a chitinous exoskeleton, a three-part body , three pairs of jointed legs, compound eyes, and two antennae...

s belonging to the order Thysanura
Thysanura is an order of insects, encompassing silverfish and firebrats, known for their three long caudal filaments.The families Machilidae and Meinertellidae of the jumping bristletails were once included with Thysanura....

. The family is considered to contain two genera: the extinct Lepidotrix, known from specimens preserved in Baltic amber
Baltic amber
The Baltic region is home to the largest known deposit of amber, called Baltic amber or succinite, with about 80% of the world's known amber found there. It dates from 44 million years ago...

, and the extant Tricholepidion, which contains a single species, Tricholepidion gertschi (commonly called the forest silverfish). Recent research has suggested the extant species should be assigned to its own family, Tricholepidiidae.