Showing posts with label Behaviour. Show all posts
Showing posts with label Behaviour. Show all posts

09 November 2025

07 October 2025

Larval Emergence - Agriocnemis femina

This larval emergence of Agriocnemis femina took place in the late morning.


Agriocnemis femina - female

02 October 2025

Larval Emergence - Orthetrum chrysis

Below show the early stage of the larval emergence of Orthetrum chrysis. The emerging adult (thorax, abdomen and legs) is pinkish red in colour. The larval emergence of Orthetrum chrysis normally takes place in the night.




30 September 2025

Larval Emergence - Copera marginipes

Below are videos showing the larval emergence of Copera marginipes (male). The larval emergence took place at noon.


part 1

part 2

part 3

part 4

25 September 2025

Xiphiagrion cyanomelas

Does Odonata stand on water? The answer from AI Overview says no. However, I had an overwhelming observation on Xiphiagrion cyanomelas at Paya Maga (ca. 1650 m a.s.l.), Sarawak in 2010. I spotted many males of Xiphiagrion cyanomelas standing on water at water pools or small ponds in Paya Maga. Their legs were basically on the water, and sometime with their tail end was also touching the surface of water. When wind blew across the water pools, they drifted smoothly across the water surface.  


Xiphiagrion cyanomelas - male
Paya Maga, Sarawak


Xiphiagrion cyanomelas - male
Paya Maga, Sarawak

20 September 2025

Indothemis carnatica

Indothemis carnatica - male
transferring sperms from end tail to secondary genitalia beneath the 2nd abdominal segment
UKM Bangi, Selangor


30 August 2025

27 August 2025

Pseudagrion microcephalum - Submerged Oviposition

I spotted a tandem pair of Pseudagrion microcephalum laying eggs at a pond at late afternoon. While the female was laying eggs above the surface water (on aquatic plant) with the male still attached in tandem to it, a male Brachythemis contaminata came suddenly to grab (preying) the male Pseudagrion microcephalum. So, the Pseudagrion microcephalum male was detached from the female. However, the female was untouched by the sudden act, and remaining at the same spot continuing to perform egg-laying. After a while, the female submerged into water to continue laying eggs (see below photos). At one time, the whole body including the wings was totally under the water.



26 August 2025

Larva - Pseudagrion microcephalum

The normal aquatic habitat for Pseudagrion microcephalum is open ponds or open marshes. I have seen frequently the larval emergence of P. microcephalum took place at late afternoon. Below photo shows a larva of P. microcephalum out of water on a waterlily leaf ready for larval emergence. The photo was taken around 5.30 pm at a pond. 


Pseudagrion microcephalum - male
ready for larval emergence
Kajang, Selangor


click here to see the adult of Pseudagrion microcephalum

23 August 2025

Aciagrion borneense Preyed by Spider

A freshly emerged male individual of Aciagrion borneense is preyed by a spider.


Aciagrion borneense - male
Kajang, Selangor

22 August 2025

Crocothemis servilia

Young male Crocothemis servilia is yellow in colour. On the other hand, the matured male is red in colour. Click here to see the matured male of Crocothemis servilia.


Crocothemis servilia - young male
obelisk posture 
Kajang, Selangor

17 August 2025

Rhyothemis triangularis - Damaged by Rain

Below photograph shows a newly emerged male individual of Rhyothemis triangularis. This photograph was taken in the morning at a pond. It looks like this male individual was successfully emerged from a larva in the night. However, this individual was caught in the rain right after its larval emergence, causing its fresh and delicate wings stuck together by the rain water.


Rhyothemis triangularis - male
UKM Bangi, Selangor

14 August 2025

Rhodothemis rufa - Unsuccessful Larval Emergence

I spotted this dead dragonfly at a retention pond of a residential area in Kajang. This dead dragonfly is of an unsuccessful larval emergence. It looks like the larval emergence took place at least 2 days ago. Close inspection of the dead dragonfly reveals that it is a male individual of Rhodothemis rufa


Rhodothemis rufa - male
Kajang, Selangor 

11 August 2025

Neurothemis fluctuans - Territorial Fighting

Two males of Neurothemis fluctuans are engaging in territorial fighting.


Neurothemis fluctuans; two males
UKM Bangi, Selangor

03 August 2025

Tetrathemis haylina - Egg Development

I collected some eggs of Tetrathemis hyalina. The eggs were laid on 26 July 2025 around 10 am. The eggs started to hatch on 2 August 2025 (minimum 8 days). Showing below is a series of egg development of a single egg from the cluster of eggs collected on 26 July 2025. This egg hatched on 3 August 2025 around noon. So, this egg took 9 days to hatch.


Egg development (ex situ) of a single egg of Tetrathemis hyalina. The first Day-9 image was taken in the morning. The second and third Day-9 images were taken in the afternoon. The second Day-9 image is an empty egg shell and the third Day-9 image is a prolarva from the egg. 

16 July 2025

Libellago lineata

Libellago lineata - territorial fighting between two males
UKM Bangi, Selangor