Orthetrum glaucum (Brauer, 1865)
金黃蜻蜓/黑尾灰蜻
Last Updated on Thursday, 29 June, 2023 12:28:06 PM
Dragonflies of Borneo > Family Libellulidae > Genus Orthetrum > Orthetrum glaucum (Brauer, 1865) 金黃蜻蜓/黑尾灰蜻
Family Libellulidae
Orthetrum glaucum (Brauer, 1865)
金黃蜻蜓/黑尾灰蜻
Found in China, Guandong, Guangxi, Hong Kong, Indonesia, India, Japan, Sri Lanka, Myanmar, Malaysia, Philippines, Peninsular Malaysia, Thailand, Taiwan, Viet Nam
Identification between Orthetrum glaucum and Brachydiplax chalybea:
| Orthetrum glaucum | Brachydiplax chalybea |
 Orthetrum glaucum |
 Brachydiplax chalybea |
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 Male ♂ 50mm Female ♀ 42mm |
 Male ♂35mm Female ♀30mm |
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 Male Orthetrum glaucum segment 8,9,10 |
 Male Brachydiplax chalybea segment 8,9,10 |
This matured female has white pruinescenc (powder) developed all over the body.
Segment 8, 9 and 10 stained with some dried mud particles indicating she has
been dropping eggs on water.
An egg remain stuck infront the opening of segment 8 of this female Orthetrum
glaucum. In the photo the egg seem round in shape but the egg is actually oval
shape.
Unlike damselflies, most dragonflies do not have a fully formed ovipositor(i.e.
without complicated structure containing paired valves and cutting blades) Thus
a female Orthetrum glaucum simply drop her eggs into water.
This is an juvenile male. Immature males look similar to females, but can be
distinguished from segment 8,9 and 10 of the abdomen,
This is a fully matured female. The compound eyes of the female are brown or
blue-green, the thorex is golden yellow, the side view has dark brown or brown
thick line stripes. Wings are transparent. Mature females have blue-green
compound eyes and gray-blue abdomen.
Other common BLUE Dragonflies of Borneo.
RELATED TOPICS
The compound eyes of dragonflies
Dragonflies and damselflies have large compound eyes that can see in all directions. When the compound eye is magnified several hundred times, each individual facet (ommatidium) is shown to be hexagonal in shape.
Ovipositor (Vulvar Lamina)
of Female Dragonflies and Damselflies
Female dragonflies have either one of the two method of depositing eggs from
the abdomen:
1- using Ovipositor Structure
2- using Vulvar Lamina
Male do not have an ovipositor. Instead male dragonfly and damselfly have appendages.
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GO FURTHER FLORA Borneo has 150 species of wild fig trees. Most of them are found in forests of Sabah. FISHERIES Prawn farming is a main commercial activities in Tawau. Spawners from Tawau are graded the best in Malaysia. For decades, Tawau has been exporting high-grade tiger prawns to several countries such as Korea, Japan, Taiwan, China, Vietnam, Singapore, Egypt and Australia. |
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Damselflies of Borneo |
