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 Major Groups | Insecta (insects) | Odonata (dragonflies, damselflies)

 
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13(1). Prementum flat or nearly so, lacking setae; labial palps not broadened distally, lying below head when closed
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Gomphidae 

prementum flat
lying below head when closed

Gomphidae 

prementum lacking setae
labial palps not broadened distally

-Prementum flat or variably concave (ladle-shaped), bearing setae; labial palps broadened distally, forming mask in front of head when closed

Note: The labium must be pulled out from the animal to view the inside surface.
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Austrocorduliidae 

prementum flat

Libellulidae 

prementum concave (ladle-shaped)

Libellulidae 

prementum with setae

Libellulidae 

labial palps broadened
forming mask in front of head

Austrocorduliidae 

labium must be pulled to view


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