An order of small, primitive, wingless insects that resemble the true bristletails but have two bristles at the end of the abdomen.
- ‘There are huge gaps in the early fossil record, since several basal hexapod groups have not been found at all in the Paleozoic: Protura, Diplura, and Thysanura.’
- ‘Similar functions have been proposed for eversible vesicles in other terrestrial arthropods including Diplura and Machilidae.’
- ‘Neither are the Parainsecta (springtails and proturans) or Diplura true insects, for their numbers of abdominal segments vary.’
- ‘The Parainsecta (springtails and proturans) and Diplura are not true insects, for their numbers of abdominal segments vary.’
- ‘When nucleotide frequencies were tested within each of the three basal hexapod groups (i.e., within Protura, within Diplura, within Collembola), they were always stationary.’
Modern Latin (plural), from di- two + Greek pleura side of the body.