Last Updated on Sunday, 11 September, 2022 04:14:46 PM


INDEX  >  Damselflies of Borneo  >  Family Coenagrionidae > Ischnura senegalensis 水田嬰(青紋細蟌) > Ischnura senegalensis emerging from Nymph


Ischnura senegalensis emerging from Nymph
Developed in water but not hatch in the water, a damselflies nymph crawl out of the water — climbing up weed stalks, bushes, or even a floating PVC — before emerging from the nymphal shell.
 

During transformation to adulthood, the veins fill with hemolymph, (insect blood), causing the wings to unfurl. Most of the hemolymph is drawn back into the body after the wings have been fully expanded. The empty tubes and the membranes dry, leaving crisp, tough wings.
 



Picture 1 : Alongside a pond -- emerging of a damselfly from its excuvia.

The nymphs was clinging to surface of a floating plastic beg. The baby damselfly has already wholly emerged from the excuvia and the wing reached its full length. Except the abdomen which was still in the process of extending.



Picture 2 : The abdomen gradually extending, a drop (or two) of clear liquid discharged from the tip.

From the shape of this last segment we know it is a Male.
 



Picture 3 : Because the emerging (on a floating PVC beg) was 1/3 meter below my feet, an inconvenient angle for camera to reach, I decided to use my left hand to lift up the PVC beg for batter angle of the camera.

This disturbed the poor insect's growing which needs a quiet and calm environment for emerging process. Within seconds it started walking toward and up to my thumb.
 



Picture 4 : My very precious moment of close encounter with natural life.

On the back of my thumb, this new Ischnura senegalensis spend 4 minutes for his final stage of extension and hardening of the body and wings.
At 4:31 pm he flop his tender wings and helicopter straight skyward and disappeared into dark shade in tree top. “Good Bye !...... welcome to the world !”
 



Here are index to damselflies sorted according to colour for our quick identification:

1- GREEN damselflies of Sabah, Borneo
2- BLUE damselflies
3- RED damselflies
4- ORANGE damselflies


Out of the global 10 families of damselflies, the following 7 families  are found in Borneo Island :

01- Family Calopterygidae 色蟌科
02- Family Chlorocyphidae 鼻蟌科
03- Family Coenagrionidae 細蟌科
04- Family Euphaeidae 溪蟌科
05- Family Lestidae 絲蟌科
06- Family Platycnemididae  琵蟌科/扇蟌科
07- Family Protoneuridae 原蟌科

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