Last Updated on Sunday, 21 February, 2016 07:47:12 PM

 

Ictinogomphus decoratus melaenops (Selys, 1858) 春 蜓

Found in China, Indonesia, Malaysia, Philippines, Peninsular Malaysia, Thailand, Viet Nam
Genus : Ictinogomphus Super-Family: AESHNOIDEA Family: GOMPHIDAE

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Ictinogomphus decoratus is a large dragonfly with a wingspan that can reach up to 13–15cm (about 5–6 inches). It has a swift flight.   Ictinogomphus decoratus  breeds  mainly in standing water.

The male superior appendages in Ictinogomphus decoratus terminate in a sharp point, (in Gomphidia they are blunt) and the 8th abdominal segment has a broad rounded flap on either side in both sexes.

Ictinogomphus decoratus has a hind wing 36 to 40 mm and heavy build with strong marking of pale green or yellow bands and spots.

Ictinogomphus decoratus  is widespread and common on standing water like open lily ponds, lakes and dams. It perches conspicuously in direct sunlight on emergent vegetation.

The larvae are curiously flattened, rounded and limpet-like. They may sometimes cling to the undersides of lily pads and frequently the mature larva clambers onto a pad to emerge, leaving a heavy, dark, rounded exuvia.

When I was trying to photograph it I could hear the  wings rustling in flight. I found this one at the forest edge of Bukit Gemuk in Sabah

It This Ictinogomphus decoratus perches conspicuously in direct sunlight above standing water of a mountain stream in Bukit Gemuk


春蜓科蜻蜓主要的共同特徵為左右複眼相隔一段距離,不在頭部背面相接,複眼則呈綠色


雄蟲上肛附器 superior anal appendages 黑色,長而直,末端鈍尖,下肛附 器 inferior anal appendage 甚短,長度約為上肛附器的1/3~1/4,有時甚至退化幾近消失,其末端深凹入成兩個分枝。

春蜓科蜻蜓大多於早春羽化且活躍於春、夏季,故而有其名。

蟲主要的共同特徵為左右複眼相隔一段距離,不在頭部背面相接,體色大多為黑底具淡綠或黃色斑,複眼則呈綠色

其成員除少數棲息於湖泊及池塘等靜止水域以外,大多為溪流型的種類,成蟲身體上斑紋的變化及雄蟲肛附器(位於第十腹節末端,交配時用來攫握雌蟲頭部後緣)的形狀為野外辨識的重點 。

Davies&Tobin於1985年成立林春蜓亞科,以取 代Tillyard&Fraser於1940年成立的扇尾春蜓亞科,本亞科現今包含7個屬,成員主要分布於亞洲及非洲的熱帶及亞熱帶地區。春蜓共同的特徵為體大型,腹長及後翅長分別在5cm及4cm以上;前後翅翅脈除了後翅下三角室以外,其餘各翅的上、下三角室及三角室均有橫脈,前翅肘臀橫 脈3-4條,後翅則為2條,雄蟲後翅肛角明顯突出;腹部第7-9節明顯膨大呈紡綞形,有些種類則在第8腹節腹側緣具瓣狀突起

幼虫各足跗節數為2-2-2,身體多為圓形,腹部中央厚而高,腹面則扁平,觸角第3節扁平而細長。

由於一般春蜓科蜻蜓的雌蟲與雄蟲在身體上的斑紋極為相似,且除了交配及產卵以外不易於繁殖水域發現.

 


 

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