Female species of Genus Prodasineura in HK
There are two species of Genus Prodasineura in HK, they are P. croconota & P. autumnalis. The most distinctive feature of this genus is their very slim abdomen.
The female Orange-backed Threadtail (P. croconota) is virtually identical to the female Black Threadtail (P. autumnalis). The two cannot be reliably identified in the field unless in tandem with the very distinctive males. --- Reels & Zhang (2015).
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