Last Updated on Tuesday, 12 April, 2022 02:33:03 PM


INDEX  >  Dragonflies of Borneo 


Common dragonflies in Borneo Island
Common dragonflies in Borneo Island
(Information of Dragonflies of Sarawak, Sabah, Brunei and Kalimantan)

The 3 common families of dragonflies found in Borneo Island:

1 Family of Aeshnidae
2 Family of Gomphid
3 Family Libellulidae


FOODS  OF  ODONATA
Dragonflies and Damselflies feed on insects


A small dragonfly eat mosquitoes every day. While the larger dragonflies eat small insects like moth, butterflies, flies and sometimes each other.


Dragonflies are not venomous and they kill and eat by ripping and tearing apart their prey usually head first.
From their hunting habits we can separate dragonflies into :
1-Hawkers
2-Darters


Hawkers are often seen continuously flying in circles. They scan the area, attack, eat in flight and re attack.
Darters can be seen resting on a twig or leaf and darts out every now and then to attack a prey flying by and then return to the twig.

Orthetrum sabina

 


Lathrecista asiatica

 


Orthetrum testaceum

 

 


Neurothemis terminata

 

 


Agriocnemis pygmaea

 

 


Agriocnemis femina oryzae

 

 


Pseudagrion pilidorsum


Ovipositor of a female dragonfly Gynacantha basiguttataFemale Vulvar lamina

Ovipositor or Vulvar lamina
of Female Dragonflies and Damselflies

The females of all damselflies and some dragonflies (Aeshnidae and Petaluridae families ) have a fully formed ovipositor, which is a complicated structure containing paired valves and cutting blades, on the underside of abdominal segments 8 and 9. The ovipositor is used to insert eggs into plant tissue, mud, or other substrate.
Some species have a stylus, which is a thin, needle like projection, at the end of each of the two valves of the ovipositor.
Vulvar lamina with a conspicuous V incision


HOW TO DISTINGUISH MALE AND FEMALE ODONATA
(DRAGONFLIES AND DAMSELFLIES)
Males and females can be distinguished as follows:
--------------


3- Males have a bump containing the accessory genitalia under the second abdominal segment; females lack this.

HOW TO DISTINGUISH MALE AND FEMALE ODONATA


2- Male dragonflies have 3 appendages at the abdomen tip, male damselflies have 4; females of both have only 2 such appendages.

Male appendages


1- Females typically have a broader abdomen than males, and female damselflies and darners (Aeshnidae) have a prominent ovipositor under segments 8 and 9.
 

HOW TO DISTINGUISH MALE AND FEMALE ODONATA

DRAGONFLY DAMSELFLY
Type 1 Female Type 2 Female ALL Female damselflies have a ovipositor
NOT ALL female dragonflies have a ovipositor. These female have a Vulvar lamina instead ONE family (Aeshnidae) of dragonflies have a ovipositor  
Dragonfly Vulvar lamina Dragonfly Ovipositor structure Damselfly Ovipositor structure
Vulvar lamina Ovipositor structure Ovipositor structure

The females of all damselflies and some dragonflies (Aeshnidae and Petaluridae families ) have a fully formed ovipositor on the underside of abdominal segments 8 and 9.
Ovipositor is a complicated structure used to insert eggs into plant tissue, mud, or other substrate.
Ovipositor structure containing :
1- Paired valves
2- Basel cutting blades, .
3- Paired stylus, which is a thin, needle like projection, at the end of each of the two valves of the ovipositor.
4- Some species (Gynacantha basiguttata) have sharp anal claws at segment 10. That perhaps serves as anchor to stabilize the abdomen while the basal plate is cutting hole and inserting eggs into plant.
Female dragonfly that do not have Ovipositor Structure will have a Vulvar lamina with a conspicuous V incision



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Damselflies of Borneo