Wednesday, July 20, 2011

Neurobasis chinensis (Green Metalwing)

Local extinction. These are the two words most dreaded by Singapore’s nature conservationists. It simply means an animal or plant which used to exist in Singapore no longer does and so a part of our natural heritage is lost. In local context, an animal is presumed nationally extinct if it has not been recorded for the last 50 years.

For odonates, we have lost a few species but perhaps the greatest lost of all is the brilliantly stunning damselfly, Neurobasis chinensis (Green Metalwing). This species belongs to a damselfly group that has amazed naturalists since it was first discovered sometime in the 18th century by scientists. It’s easy to see why. The gleaming flashes of metallic green wings as the males fly along a forest stream in their repertoire of territorial and courtship behavior is a sight to marvel. So much have these damselflies capture the wonder of naturalists that a book specifically dedicated to them was published four years ago.

I’ve seen Neurobasis chinensis in Peninsular Malaysia but not really been able to take clear photographs or videos till a recent trip to Langkawi. Males of Neurobasis genus will patrol and defend territories very vigorously at sunlight spots along streams . When displaying to each other, males will reduce the beats of their hindwings thus displaying the metallic iridescent green colour in its full glory under sunshine. In this way, males would chase each other along a stream in overlapping flights, wild chases, or tight spinning circles.
Sometimes a perched male may be challenged by an intruder. When this happens, the defending male will have his abdomen raised with the tip pointing down while the intruder hovers just in front. Both males will then flash the hindwings. The video shows this behaviour and we can see why these damselflies are so enthralling to observe.

N. chinensis is extensively distributed in South and Southest Asia. It is one of about 14 species in the genus. N. chinensis can inhabit a wide variety of habitat, from unspoiled mountain forest streams to slightly disturbed lowland sandy streams. Unfortunately it was last recorded from Singapore in 1970. The last known habitat within Macritchie reservoir’s streams was destroyed due to heavy siltation during the construction and subsequent expansion of the PIE. So it is now a 41 years gap of sighting. Technically the damselfly is not presumed nationally extinct till the dreaded number hit 50 years. But researchers have thus far failed to find the species and to the best of our knowledge, habitats suitable for N. chinensis to thrive no longer exist. Impoundments of rivers for reservoirs and heavy siltation from various constructions encroaching onto our nature reserves have taken their toll. But maybe, just maybe, someone might spot it one day before the 50 years is up.

We hope some resilient population of this damselfly, fittingly dubbed “Birds of Paradise amongst Odonata”, are still hanging on somewhere in Singapore.

Pictures and video taken at: Pulau Langkawi, July 2011


Davison, G. W. H., P. K. L. Ng & H. C. Ho (eds), 2008. The Singapore Red Data Book: Threatened Plants and Animals of Singapore. 2nd Edition. The Nature Society (Singapore), Singapore

Murphy, D. H., 1997. Odonata biodiversity in the Nature Reserves of Singapore. In Proceedings of the Nature Reserves Survey Seminar. Gardens’ Bulletin Singapore. 49:333-352.

Orr, A. G. & M. Hämäläinen, 2007. The Metalwing Demoiselles (Neurobasis and Matronoides) of the Eastern Tropics: Their Identification and Biology. Natural History Publications, Borneo.

Tang, H. B., L. K. Wang & M. Hämäläinen, 2010. A Photographic Guide to the Dragonflies of Singapore. Raffles Museum of Biodiversity Research, Singapore.


Anonymous said...

I am here to help get your site off to a fantastic start off. Do not be one of these that wished that they had completed it much better the first time, then get on the job, and price, of beginning above. Your website displays what you as well as your enterprise or hobby are all about.

I'm able to provide low-cost, user-friendly, customized created internet sites for a broad range of businesses, organizations and groups.In addition, it should not expense a lot of money to obtain you started. I'll help guide you via the method as well as alert you after i think you could be obtaining in more than your head, or past your spending budget.

Listed below are some hight quality companies for a resonable price:

Front-End Development
Custom web site design
Affordable web site design
E-Commerce website design
Corporate Website Design
Innovative website design
Static Web Design
Website maintenance
Web site re-designs
SEO Services
Logo Design

Please look around the site for further information about the [url=]freelance web designer[/url] services that I am able to offer and to see examples of websites that I have designed



Anonymous said...

[url=]Monavie Juice Australia[/url]
[url=]100% Winning Sports Betting Software[/url]
[url=]Bodybuilding Blog[/url]
[url=]Bodybuilding and Fitness Blog[/url]
[url=]Build a Chicken Coop[/url]
[url=]Build a Chicken Coop Plans[/url]
[url=]Cell Phone Marketing[/url]
[url=]Chicken Coop[/url]
[url=]Chicken Coop Plans[/url]
[url=]Clear Braces Sydney [/url]
[url=]Commission Crusher - Triple Threat Software[/url]
[url=]Concentrated Violin Lessons[/url]
[url=]Cosmetic Dentist Sydney[/url]
[url=]DIY Dog Training[/url]
[url=]Dog Training[/url]
[url=]Dog Training Made Easy[/url]
[url=]Email Marketing and SEO Specialist[/url]
[url=]Extreme Traffic Arbitrage[/url]
[url=]Forex FAP Turbo Robot[/url]
[url=]Gourmet Food[/url]
[url=]Gourmet Food Blog[/url]
[url=]Guitar Scale Mastery[/url]
[url=]How to Win the Lottery[/url]
[url=]Invisalign Sydney[/url]
[url=]Invisalign Teen[/url]
[url=]Invisalign Teen Sydney[/url]
[url=]Jamorama - Learn to Play Guitar Online[/url]
[url=]Ken Silver Lotto[/url]
[url=]Ken Silver Lotto System[/url]
[url=]Learn to Play Guitar Online[/url]
[url=]Local Mobile Monopoly[/url]
[url=]Lotto Black Book[/url]
[url=]Magic of Making Up[/url]
[url=]MOWG = Mass Optimized Webpage Generation[/url]
[url=]Play Guitar Online[/url]
[url=]Pregnancy Miracle[/url]
[url=]Rocket Piano[/url]
[url=]Satellite Direct - Watch TV Online for Free[/url]
[url=]SEO Specialist[/url]
[url=]SEOPressor Premium Wordpress Plugin [/url]
[url=]Silver Lotto $10 Discount Offer[/url]
[url=]Silver Lotto[/url]
[url=]Silver Lotto System[/url]
[url=]Singorama - Learn to Sing Like a Pro![/url]
[url=]Ted's Woodworking[/url]
[url=]Top Arbitrage Betting[/url]
[url=]Truth About Abs[/url]
[url=]Win the Lottery[/url]
[url=]Win the Lottery 9 Out of 10 Times[/url] [url=][img][/img][/url]

webdesign in singapore said...

My cousin recommended this blog and she was totally right keep up the fantastic work!Web Design in Singapore

seo singapore said...

My cousin recommended this blog and she was totally right keep up the fantastic work!Seo Singapore

Web Design Singapore said...

Wonderful blog & good post.Its really helpful for me, awaiting for more new post. Keep Blogging!

Web Design Singapore

Web Design Singapore said...

Heya¡­my very first comment on your site. ,I have been reading your blog for a while and thought I would completely pop in and drop a friendly note. . It is great stuff indeed. I also wanted to there a way to subscribe to your site via email?

Web Design Singapore

Anonymous said...

40 and over dating in chicago hiv positive dating chicago

Anonymous said...

download animorph ebook 6th edition kuby immunology free ebook [url=]recover ebook client list[/url] electronic security systems advisor master ebook

Anonymous said...

windmill plans ebook sande ken ebook [url=]fa ebook login[/url] organizational behaviour ebook free download

Anonymous said...

painter painting software acer arcade software bundle [url=]weight watching software[/url] windows xp cannot install software
[url=]3herosoft MPEG to DVD Burner 3.5 MacOSX - Cheap Legal OEM Software, Software Sale, Download OEM[/url] simple internet web monitoring software

Anonymous said...

sharp cash register software best reviews for internet security software [url=]mc squared software[/url] organizer software for blackberry
[url=]Erfasoft BitSec Secure Folder 2.6 - Software Store[/url] best software to track cheating spouse

Anonymous said...

teacher tool box grading software services software support [url=]openvms software kit[/url] computer software freeware downloads 100 free
[url=]Politique de confidentialite - Cheap Legal OEM Software, Software Sale, Download OEM[/url] gold cd duplication software

Anonymous said...

acer pc treasures software computer aided software engineering issues [url=]computer cognitive scanning software[/url] computer caller id software
[url=]Emurasoft EmEditor Professional 11.0 x64 MULTILINGUAL - Download OEM, Software Sale, OEM Software[/url] windows vista free slideshow software

Anonymous said...

opensource web development software opera 6.0 software [url=]p2p software for video sharing[/url] government reporting software piracy
[url=]Business - Download OEM, Software Sale, OEM Software[/url] shimadzu ez test software

Anonymous said...

university of colorado school of pharmacy pharmacy inventory technician [url=]shadyside pharmacy[/url]
foreign pharmacy viagra open pharmacy [url=]viagrx[/url]
lamictal canadian pharmacy pharmacy infusion therapy [url=]u save pharmacy[/url]
texas state board of pharmacy online pharmacy avonex [url=]cozaar[/url]

Anonymous said...

canadian pharmacy tramadol no rx boise pharmacy [url=]online canada pharmacy[/url]
post subject pharmacy update bottle list day carlos doctor email tennessee laws that apply to pharmacy technician [url=]ditropan[/url]
cvs pharmacy printable coupon walmart pharmacy germantown maryland [url=]etsu pharmacy school[/url]
olmos pharmacy san antonio samples of personal essays for pharmacy schools [url=]adalat[/url]

Anonymous said... - [url=]wiki[/url]

Home Inicio said...

Great posting that will enrich my knowledge. Thanks very Much!

Susan said...

You make so many great points here that I read your article a couple of times. Your views are in accordance with my own for the most part. This is great content for your readers.
instagram viewer