nsects 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. As used here, the term Insecta is synonymous with Ectognatha. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae. 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. The total number of extant species is estimated at between six and ten million; potentially over 90% of the animal life forms on Earth are insects. 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.

Conhead mantis checking the environment from a rock - Nature Stock Photo Agency
Praying mantis posing on a rock - Nature Stock Photo Agency
Golden orb spider on the island of Langkawi - Nature Stock Photo Agency
Manna cicada between the leaves on a tree - Nature Stock Photo Agency
Conehead mantis looking straight into the lens - Nature Stock Photo Agency
Cicada in between the trees and leaves - Nature Stock Photo Agency
Praying mantis on top of a rock - Nature Stock Photo Agency
Conehead mantis in praying position - Nature Stock Photo Agency
Cicada exuviae handing upside down - Nature Stock Photo Agency
Cicada exoskeleton hanging on wood - Nature Stock Photo Agency
Common blue on lavender - Nature Stock Photo Agency
Golden orb weaver spider in its web - Nature Stock Photo Agency
Cicada orni hidden on a tree - Nature Stock Photo Agency
Golden orb spider in her web - Nature Stock Photo Agency
Cicada camouflaged between the branches - Nature Stock Photo Agency
Cicada orni on a tree trunk - Nature Stock Photo Agency
Common Asian tiger butterfly catching some sun - Nature Stock Photo Agency
Northern Golden Orb spider from sideview - Nature Stock Photo Agency
Cicada Orni looking for some shade in the Provence - Nature Stock Photo Agency
Golden orb spider in its web with sky behind - Nature Stock Photo Agency
Cicada camouflaged on a tree with moss - Nature Stock Photo Agency
Cicada orni hanging vertical on a tree - Nature Stock Photo Agency
Cicada on a tree branch - Nature Stock Photo Agency
Northern golden orb weaver central portrait - Nature Stock Photo Agency
Cicada on a tree branch - Nature Stock Photo Agency
six-spot burnet on lavender - Nature Stock Photo Agency
Cicada sitting on a tree during the day - Nature Stock Photo Agency
Cicada orni hanging upside down - Nature Stock Photo Agency
Cicada close-up - Nature Stock Photo Agency
Cicada hidden in a tree - Nature Stock Photo Agency
Cicada orni on a tree - Nature Stock Photo Agency
Marbled white butterfly on lavender - Nature Stock Photo Agency
Cicada orni resting during the day - Nature Stock Photo Agency
Scarce swallowtail on lavender - Nature Stock Photo Agency
Cicada in a tree trunk - Nature Stock Photo Agency
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