Hemicordulia tau

1 Tau Emerald at Evatt, ACT

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Identification history

Hemicordulia tau	11 Apr 2020	roymcd
Hemicordulia tau	11 Apr 2020	roymcd
Unverified	10 Apr 2020	TimL

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User's notes

The dragonfly was sighted resting after a recent cold night. The fourth and fifth images show what I understand to be part of the dragonfly’s respiratory system, an anterior thoracic spiracle valve behind the dragonfly’s head. It was beating open and closed every two seconds, serving the head and the wing muscles. The valve is the circular yellow object with a fold across it, located behind the head and in the centre of each image. Toggling between the two images shows the valve beat closed/open. It is closed in the fourth image and open in the fifth image.

2 comments

RodDeb wrote:

10 Apr 2020

Wow what amazing images Tim

TimL wrote:

11 Apr 2020

Thanks, I'm glad you like them. Tim

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Location information

Coordinates 149.063992 -35.213357
Altitude 598.4m
Places Evatt, ACT

Sighting information

1 Abundance
6 Apr 2020 09:58 AM Recorded on
TimL Recorded by
Collections
TimL Canberra & Southern Tablelands NatureMapr Dragonflies (Anisoptera) Dragonflies & Damselflies (Odonata) Insects

Additional information

50mm or larger Animal size

Species information

Hemicordulia tau Scientific name
Tau Emerald Common name
Not Sensitive
Local native
Non-invasive or negligible
Up to 1635.4m Recorded at altitude
Machine learning
External link More 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

Australian Capital Territory

New South Wales

Queensland

Northern Territory

Western Australia

South Australia

Victoria

Tasmania