Syndyas Loew. The 1857
Creators: name: Grootaert, Patrick
name: Yang, Ding
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Hybotidae
Syndyas

description: KEY TO ORIENTAL AND AUSTRALASIAN SYNDYAS   
1 Discal cell shorter than basal cells...................................... 2  
– Discal cell as long as basal cells......................................... 4  
 2 Discal cell very short, basal cells nearly 3 times longer. (Sri Lanka, Papua New Guinea).............. S. parvicellulata Bezzi   
– Discal cell longer................................................................. 3  
 3 Basal cells about 1.5 times as long as discal cell. Mesonotum black, without blue shine. Abdomen not elongated (Indonesia: Krakatau).............................................. S. brevior de Meijere   
 – Basal cells almost as long as discal cell. Mesonotum black in ground-colour, with a blue shine. Abdomen long and slender (Indonesia: Krakatau)........................ S. elongata de Meijere   
 4 Tarsomeres 1 and 2 of all legs yellow (Taiwan)......................................................................................... S. orientalis Frey   
– All tarsomeres black............................................................ 5  
 5 Wing clear (India, Myanmar)............. S. vitripennis Brunetti   
– Wing not clear, but yellowish to brownish tinged............. 6  
 6 Wing yellowish tinged, no stigma (Philippines).............................................................................................. S. dapana Frey   
 – Wing brownish tinged, usually with stigma (except S. eumera)................................................................................. 7   
 7 Halter dark yellow, wing brown with dark brown stigma (China: Zheijang)....................................... S. sinensis Yang & Yang   
– Halter black.......................................................................... 8  
 8 Brown stigma present. Hind femur club-shaped (less distinct in S. nigripes)....................................................................... 9   
 – No stigma present. Hind femur very thickened (thickest near middle) (Papua New Guinea)...................... S. eumera Bezzi   
 9 Veins R 4+5 and M are straight running parallel toward costa. Hind femur ventrally with a row of bristles (not spiny). (Indonesia: Ceram)............................................... S. aterrima de Meijere   
 – Veins R 4+5 and M converging towards wing tip, but turning up just before meeting the costa. Hind femur ventrally with a row of long spiny bristles......................................................... 10   
 10 Hind femur strongly swollen (club-shaped). Tip of right epandrial lamella bifurcate, outer lobe bearing broad black bristly hairs (Singapore)............................. S. singaporensis, new species   
 – Hind femur weakly swollen. Tip of right epandrial lamella bifurcate, outer lobe with only ordinary hairs (North Palaearctic, Oriental China – Guizhou, Hainan)................................................................................................... S. nigripes (Zetterstedt)
description: Published as part of Grootaert, Patrick & Yang, Ding, 2009, A New Syndyas Loew, 1857 (Diptera: Hybotidae: Hybotinae) From Mangroves In Singapore, With A Review Of The Oriental And Australasian Species, pp. 17-24 in Raffles Bulletin of Zoology 57 (1) on page 18, DOI: 10.5281/zenodo.4508192