Last Updated on : Sunday, 04 June, 2017 11:28:56 PM
Ovipositor of female dragonflies
or Vulvar Lamina
of Female Dragonflies and Damselflies
Female dragonflies have two method of depositing eggs from the abdomen:
1- using Ovipositor Structure
2- using Vulvar Lamina
|The two methods of deposit eggs by Odonata:|
|1- using Vulvar Lamina
2- using Ovipositor Structure
Exophytic eggs are laid by dipping the tip of the abdomen beneath the water whilst in flight.
Endophytic eggs are inserted into a substrate such as plant tissue
The females of all damselﬂies and some dragonﬂies (Aeshnidae and Petaluridae
families) have a fully formed ovipositor, which is
a complicated structure on the underside
of abdominal segments 8 and 9 containing :
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.
The Basal Blades of ovipositor is consequently blade like enabling the insect to cut into the plant material or other substrate.
|Type 1 Dragonflies||Type 2 Dragonflies||All Damselflies|
The terminal segments adult female Anax imperator, external ventral (B) and lateral (C) views.
Lam, basal plate基礎板of ovipositor (lamina valvarum);
V1, first valves 閥門 of ovipositor (valvulae 1);
V2, second valves 閥門 of ovipositor (valvulae 2);
V3, third valves 閥門 of ovipositor (valvulae 3);
St, stylus 觸針 = A pair of thin needle like stylus that serves as sensor in egg positioning
Vulvar lamina (subgenital plate) with a conspicuous “V” incision 切口.
Bottom view of the terminal segments of an adult female Oligoaeschna foliacea.
1) Lam - the basal plate of
ovipositor (lamina valvarum);
The family of Aeshnidae has a fully formed ovipositor which
is a complicated structure covering segments 8 to 10. The
ovipositor is used to insert eggs into plant tissue, mud, or