Cerdistus sp. (genus)

Yellow Slender Robber Fly at Fisher, ACT

Cerdistus sp. (genus) at Fisher, ACT - 22 Jan 2020
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Identification history

Cerdistus sp. (genus) 22 Feb 2020 GregD
Unidentified 22 Jan 2020 EvanT

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User's notes

Does anyone know what this is? It was moving it’s tail around, almost like it was feeling for something.

2 comments

michaelb wrote:
   22 Feb 2020
Referred to our robber fly moderator.
GregD wrote:
   22 Feb 2020
The 'tail' is the ovipositor and presumably the fly was sensing if the substrate was suitable for oviposition. The group mostly seek out seed heads (often but not always grasses) as a suitable site. A confused fly?

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Location information

Sighting information

  • 1 - 3 Abundance
  • 22 Jan 2020 10:20 AM Recorded on
  • EvanT Recorded by

Additional information

  • 12mm to 25mm Animal size

Species information

Record quality

  • Images or audio
  • More than one media file
  • Confirmed by an expert moderator
  • Nearby sighting(s) of same species
  • GPS evidence of location
  • Description
  • Additional attributes
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