Insects
Dragonflies & Damselflies (Odonata)
Dragonflies (Anisoptera)
Sighting 4361682

Hemicordulia tau

Tau Emerald at Googong, NSW

Hemicordulia tau at Googong, NSW - 12 Dec 2020 11:07 AM
Hemicordulia tau at Googong, NSW - 12 Dec 2020 11:07 AM
Hemicordulia tau at Googong, NSW - 12 Dec 2020 11:07 AM
Hemicordulia tau at Googong, NSW - 12 Dec 2020 11:07 AM
Hemicordulia tau at Googong, NSW - 12 Dec 2020 11:07 AM
Hemicordulia tau at Googong, NSW - 12 Dec 2020 11:07 AM
Hemicordulia tau at Googong, NSW - 12 Dec 2020 11:07 AM
Hemicordulia tau at Googong, NSW - 12 Dec 2020 11:07 AM
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Identification history

Unverified 13 Dec 2020 WHall
Hemicordulia tau 13 Dec 2020 HarveyPerkins
Hemicordulia australiae 13 Dec 2020 WHall

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3 comments

WHall wrote:
   13 Dec 2020
Hi Harvey, why H. tau and not H. australiae?

Bill
HarveyPerkins wrote:
   13 Dec 2020
Four key corroborating features: 1. the lack of dorsal extension of the yellow patches on abdominal segments 7 and 8; 2. the inverted black "T" mark on the frons (there would be a metallic black patch on the upper frons for an Australian Emerald); 3. the brown upper part of the eyes (rather than blueish/greeninsh); and 4. the yellow pterostigma in this young individual (darker in australiae). Your photos are excellent for showing all of these features.
WHall wrote:
   13 Dec 2020
Thank you for this explanation and your kind comments re the images.

Bill

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Location information

Sighting information

Additional information

  • Grevillea sp Associated plant
  • 25mm to 50mm Animal size

Species information

Record quality

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