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Insecta

Common names: insects

Probability of encounter: high

Quarantine importance: high. 

Similarity to mites: small size and obscure segmentation in some (e.g. scale insect crawlers).  Insects can usually be distinguished from mites by their antennae, compound eyes, wings, or clear segmentation.
 

Morphology
Normal adult length: usually >3 mm (range 0.6 - >100 mm)
Body tagmata: head, thorax, abdomen
Eyes: various - absent, compound, ocelli
Antennae: present, variously formed
Mouthparts: mandible, maxillae, labium, labrum, maxillary and labial palps usually distinct
Legs: 3 thoracic pairs
Distinguishing features: wings (when present); hexapod thorax, head with antennae, compound eyes.

Comments: Insects have a head with antennae (and often compound eyes); a thorax with 3 pairs of legs (and often 1-2 pairs of wings); and an abdomen that usually lacks styli, but may have an ovipositor.

Diversity: lots

References

Tree of Life - http://tolweb.org/tree?group=Insecta&contgroup=Hexapoda