The egg of Libellulidae 1
A final renewal day is September 23, 2003.
Libellulidae except for Sympetrum with the record in Kinki area are 15 kinds. The species that I haven't observed an egg yet are Libellula angelina, Tramea transmarine euryale and Tholymis tillarga. Collection is prohibited with Libellula Angelina which is species that it is apprehensive for the extinction. Tramea transmarine euryale and Tholymis tillarga are species that it is seldom collected in Kinki area. There is an egg of a form to look like a globular form in Sympetrum. But, the shape of the egg except for Sympetrum of Libellulidae is a form to look like an ellipsoid. (The egg of Tramea is almost a globular form.) An egg and each prolalva appeared on this page, too.
How to obtaining eggs : A female of Pseudothemis zonata and Deielia phaon lays eggs alone in the plant and so on which floated in the surface of the water. So, that plant and so on is collected. Other species collect the female which lays eggs. It lays eggs when female valvula valvae is soaked in water.
1. Lyriothemis pachygastra (Selys)
Size: Right after laying; head diameter; 0.47mm, a short diameter 0.30mm. Just before hatching; head diameter 0.52mm, a short diameter; 0.37mm. Duration of egg: The shortest duration; 8days. Average duration; 8days.
Figure11-1: Left; after laying, the 9th day Right; prolalva The period of prolalva (until it becomes 1st-inster lalva from hatching.) is about 11 minutes.
2. Orthetrum albistyrum speciosum (Uhler)
Size: Right after laying; head diameter; 0.50mm, a short diameter 0.26mm. Just before hatching; head diameter 0.51mm, a short diameter; 0.35mm. Duration of egg: The shortest duration; 5days. Average duration; 5days.
Figure11-2: Left; after laying, the 5th day Right; prolalva The period of prolalva (until it becomes 1st-inster lalva from hatching.) is about 4 minutes.
3. Orthetrum japonicum japonicum (Uhler)
Size: Right after laying; head diameter; 0.54mm, a short diameter 0.32mm. Just before hatching; head diameter 0.60mm, a short diameter; 0.39mm. Duration of egg: The shortest duration; 8days. Average duration; 8days.
Figure11-3: Left; after laying, the 8th day Right; prolalva The period of prolalva (until it becomes 1st-inster lalva from hatching.) is about 5 minutes.
4. Orthetrum triangulare melania (Selys)
Size: Right after laying; head diameter; 0.51mm, a short diameter 0.29mm. Just before hatching; head diameter 0.58mm, a short diameter; 0.36mm. Duration of egg: The shortest duration; 8days. Average duration; 8days.
Figure11-4: Left; after laying, the 7th day Right; prolalva The period of prolalva (until it becomes 1st-inster lalva from hatching.) is about 11 minutes.
5. Libellula quadrimaculata asahinai Schmidt
Size: Right after laying; head diameter; 0.53mm, a short diameter 0.31mm. Just before hatching; head diameter 0.60mm, a short diameter; 0.38mm. Duration of egg: The shortest duration; 8days. Average duration; 9days.
Figure11-5: Left; after laying, the 8th day Right; prolalva The period of prolalva (until it becomes 1st-inster lalva from hatching.) is about 8 minutes.
6. Libellula angelina Selys
Collection is prohibited with this species.
7. Nannophya pygmaea Rambur
Size: Right after laying; head diameter; 0.41mm, a short diameter 0.27mm. Just before hatching; head diameter 0.47mm, a short diameter; 0.35mm. Duration of egg: The shortest duration; 8days. Average duration; 9days.
Figure11-6: Left; after laying, the 9th day Right; prolalva The period of prolalva (until it becomes 1st-inster lalva from hatching.) is about 8 minutes.
8. Deielia phaon (Selys)
Size: Right after laying; head diameter; 0.55mm, a short diameter 0.27mm. Just before hatching; head diameter 0.61mm, a short diameter; 0.34mm. Duration of egg: The shortest duration; 6days. Average duration; 9days.
Figure11-7: Left; after laying, the 6th day Right; prolalva The period of prolalva (until it becomes 1st-inster lalva from hatching.) is about 4 minutes.
9. Crocothemis servilia mariannae Kiauta
Size: Right after laying; head diameter; 0.48mm, a short diameter 0.28mm. Just before hatching; head diameter 0.51mm, a short diameter; 0.36mm. Duration of egg: The shortest duration; 5days. Average duration; 6days.
Figure11-8: Left; after laying, the 6th day Right; prolalva The period of prolalva (until it becomes 1st-inster lalva from hatching.) is about 10minutes.
10 - 27 are Sympetrum（Libellulidae.） It is on the additional page.
28. Pseudothemis zonata (Burmeister)
Size: Right after laying; head diameter; 0.66mm, a short diameter 0.30mm. Just before hatching; head diameter 0.71mm, a short diameter; 0.37mm. Duration of egg: The shortest duration; 8days. Average duration; 12days. A female lays eggs alone in the plant and so on which floated in the surface of the water. A female lays eggs repeatedly. For that time, male guarding behavior is seen.
Figure11-9: Left; after laying, the 8th day Right; prolalva The period of prolalva (until it becomes 1st-inster lalva from hatching.) is about 3 minutes.
29. Tholymis tillarga (Fabricius)
I haven't collected an egg yet.
30. Rhyothemis fuliginosa Selys
Size: Right after laying; head diameter; 0.42mm, a short diameter 0.24mm. Just before hatching; head diameter 0.47mm, a short diameter; 0.32mm. Duration of egg: The shortest duration; 5days. Average duration; 6days.
Figure11-10: Left; after laying, the 6th day Right; prolalva The period of prolalva (until it becomes 1st-inster lalva from hatching.) is about 6 minutes.
31. Tramea virginia (Rambur)
Size: Right after laying; head diameter; 0.49mm, a short diameter 0.44mm. Just before hatching; head diameter 0.53mm, a short diameter; 0.49mm. Duration of egg: The shortest duration; 5days. Average duration; 9days.
Figure11-11: Left; after laying, the 6th day Right; prolalva The period of prolalva (until it becomes 1st-inster lalva from hatching.) is about 4 minutes 30 seconds.
32.Tramea transmarina euryale Selys
I haven't collected an egg yet.
33. Pantala flavescens (Fabricius)
Size: Right after laying; head diameter; 0.47mm, a short diameter 0.31mm. Just before hatching; head diameter 0.56mm, a short diameter; 0.40mm. Duration of egg: The shortest duration; 3days. Average duration; 4days. Durations of egg of Pantala flavescens is especially short in the dragonfly.
Figure11-12: Left; after laying, the 4th day Right; prolalva The period of prolalva (until it becomes 1st-inster lalva from hatching.) is about 2minutes 30 seconds.
