Onomarchus (katydid)

{{Short description|Genus of cricket-like animals}}

{{Automatic taxobox

| image = Onomarchus_Kanara.jpg

| image_caption = Onomarchus uninotatus from the Western Ghats of India

| taxon = Onomarchus

| authority = Stål, 1874

| synonyms = * Astralia Kirby, 1906

• Onomarchis Hebard, 1922
• Onomarcus Pictet & Saussure, 1892

}}

OnomarchusStål C (1874) Recensio Orthopterorum. Revue critique des Orthoptères décrits par Linné, De Geer et Thunberg 2 Locustina: 51, 68. is a genus of bush crickets or katydids found mainly distributed in the tropical forests of Asia. Like many other members of the subfamily Pseudophyllinae, their wings appear very leaf-like.

File:Onomarchus wing.jpg

A study of O. uninotatus found it to produce sounds at an unusually low frequency of about 3.5 kHz. The tympanal membrane cuts out high frequencies unlike the sound filters found in other Tettigoniids.{{cite journal |last1=Rajaraman |first1=K. |last2=Mhatre |first2=N. |last3=Jain |first3=M. |last4=Postles |first4=M. |last5=Balakrishnan |first5=R. |last6=Robert |first6=D. |title=Low-pass filters and differential tympanal tuning in a paleotropical bushcricket with an unusually low frequency call |journal=Journal of Experimental Biology |date=2012 |volume=216 |issue=5 |pages=777–787 |doi=10.1242/jeb.078352 |pmid=23125342|doi-access=free }}