Michels joseph dating techniques in archaeology
As it allows for rapid yet stable movement, many insects adopt a tripedal gait in which they walk with their legs touching the ground in alternating triangles, composed of the front & rear on one side with the middle on the other side.
Insects are the only invertebrates to have evolved flight, and all flying insects derive from one common ancestor.
The word "insect" comes from the Latin word insectum, meaning "with a notched or divided body", or literally "cut into", from the neuter singular perfect passive participle of insectare, "to cut into, to cut up", from in- "into" and secare "to cut"; (éntomos) or "insect" (as in entomology), which was Aristotle's term for this class of life, also in reference to their "notched" bodies.
"Insect" first appears documented in English in 1601 in Holland's translation of Pliny.
The evolutionary relationship of insects to other animal groups remains unclear.
The higher-level phylogeny of the arthropods continues to be a matter of debate and research.
Insects are the most diverse group of animals; they include more than a million described species and represent more than half of all known living organisms.
Insects may be found in nearly all environments, although only a small number of species reside in the oceans, which are dominated by another arthropod group, crustaceans. Insect growth is constrained by the inelastic exoskeleton and development involves a series of molts.
Clockwise from top left: dance fly (Empis livida), long-nosed weevil (Rhinotia hemistictus), mole cricket (Gryllotalpa brachyptera), German wasp (Vespula germanica), emperor gum moth (Opodiphthera eucalypti), assassin bug (Harpactorinae) Insects or Insecta (from Latin insectum) are hexapod invertebrates and the largest group within the arthropod phylum.
Definitions and circumscriptions vary; usually, insects comprise a class within the Arthropoda.
In the Pancrustacea theory, insects, together with Entognatha, Remipedia, and Cephalocarida, make up a natural clade labeled Miracrustacea.