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Glossary of Aquatic Insects

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Mandibles
Posterior to labrum and at sides of mout in pair
Labrum
Platelike "upperlip" attached to front margin, most anterior mouth part
Abdomen
3rd body region, longest region + composed of several segs. (8-11)
Labium
"Lower lip" posterior of mout
Basal
Oringin of structure, generally closest to point of attachment to body
Exoskeleton
Outerskin
Head
Capsul-like + contains feeding appratus and many of the sensory organs
Trunk
Thorax + abdomen are undifferentiated
Distal
Far away from midline of body
Promixal
Close to midline of body
Posterior
Tail end of body or part of structure closest to tail of body
Anterior
Head end of body or part of structure closest to head of body
Ventral
Lower or bottom part of body or structure
Lateral
Side of body or structure
Medial
Longitudinal midline of body or structure
Dorsal
Upper or top part of body or structure
Thorax (3 parts)
1.) Prothorax (anterior or 1rst segment)
2.) Megothorax (2nd or middle)
3.) Metathorax (posterior or 3rd segment)

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