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

 
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3(2). Lateral spines on abdominal segments 8 and 9 both at least as long as middorsal length of respective segment (8L and 9L)
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Hydrobasileus  

lateral spines on segments 8 and 9
as long as middorsal length

-Lateral spines on abdominal segment 8 at least shorter than middorsal length (ML) of segment 8

Note: For very small larvae, lateral spines may not be apparent.

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Austrothemis  

lateral spines on segment 8
shorter than middorsal length