Hemicordulia tau at Googong, NSW

Hemicordulia tau

Tau Emerald at Googong, NSW

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Identification history

Unidentified	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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