Overview

Brief Summary

Introduction

This order of wingless insects consists of about 350 known species. They hide under bark, in litter, and in rock crevices, and feed on algae, lichens, and vegetable debris.

  Oldest fossil considered as Archaeognatha is from the Devonian (390 million years old) from Gaspé, Québec (Labandeira et al., 1988). 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.   

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Comprehensive Description

Characteristics

Recent archaeognathans share two notable derived features:  
     
  • Compound eyes enlarged, medially contiguous 

       

  • Specialized musculature of abdomen, which allows them to jump by a rapid downward bending 
  Archaeognathans also share a number of primitive features. Their mandibles are monocondylic, that is, with only one condyle (the joint or socket-like attachement point to the head capsule), whereas other insects have two condyles ("dicondylic"). This primitive mouthpart feature gives the order its name (Arche - beginning, gnathos - jaw).

   Their abdominal segments bear styles, which are small appendages moveable by muscles. They can be seen underneath the abdomen in the following picture:

 Styli may be remnants of ancestral limbs. 

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records:497
Specimens with Sequences:369
Specimens with Barcodes:356
Species:20
Species With Barcodes:20
Public Records:341
Public Species:18
Public BINs:63
Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Barcode data

Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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