Nihonogomphus Oguma 1926
Creators: name: Wilson, Keith Duncan Peter
name: Xu, Zaifu
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Gomphidae
Nihonogomphus

description: Key to Nihonogomphus Oguma 1926   
Figs. 22 (a–g), 23(a–e)  
 1 Penile organ without posterior lobe (prepuce); antehumeral stripe absent or present as short narrow stripe without superior spot – Nihonogomphus sensu stricto............................................................................................................... 2   
 - Penile organ with a posterior lobe (prepuce); antehumeral stripe long with or without a superior spot, rarely with a superior spot present and stripe absent – Nihonogomphus (Lobogomphus)............................................................... 14   
2 Sides of synthorax entirely yellow................................................................................................................................ 3  
- Sides of synthorax with a black suture between metepisternum and metepimeron..................................................... 4  
 3 Labrum, clypeus and antefrons yellow; subgenital plate with broad, shallow notch; synthorax with broad conjoined yellow dorsal stripes; antehumeral stripe absent. Male unknown; China (Fujian)................. N (N.) gilvus Chao 1954   
 - Labrum black with a broad yellow transverse stripe across middle, clypeus and face of frons yellow; subgenital plate triangular-shaped without central notch or cleft; antehumeral stripe absent. Male unknown; China (Fujian)............... ............................................................................................................................ N (N.) luteolatus Chao and Liu 1990   
4 Labrum black or black and yellow............................................................................................................................... 5  
 - Labrum pale green; occiput grass-green, brownish at sides; synthorax background colour reddish-brown. Female unknown; Burma, Thailand.................................................................................... N (N.) pulcherrimus (Fraser 1927)   
5 Anterior hamulus very long and straight with a long, straight, narrow shaft above shoulder and a tiny hook at the apex............................................................................................................................................................................... 6  
- Tip of anterior hamulus gradually curved to form shallow hook, which has a relatively shorter shaft above shoulder or is without a shoulder................................................................................................................................................. 7  
 6 Labrum black with a yellow transverse stripe; occiput yellow broadly bordered black; tips of superior appendages with a scoop-shaped, inner fold; posterior hamulus has a broad, humped base and prominent, claw-like tip; subgenital plate located in v-shaped recess. (Figs. 23a–e); China (Fujian, Guangdong)............ N (N.) semanticus Chao 1954   
 - Labrum black; occiput yellow, finely bordered black; tip of superior appendages without scoop-shaped inner fold; posterior hamulus narrow, lacking a hump-like base with a claw-like tip; subgenital plate located in u-shaped recess; China (Guangxi, Hainan), Vietnam............................................................................. N (N.) thomassoni (Kirby 1900)   
7 Anterior hamulus without a pronounced shoulder........................................................................................................ 8  
- Anterior hamulus with a pronounced shoulder........................................................................................................... 10  
 8 Anterior hamulus without a shoulder; synthorax with broad conjoined yellow dorsal stripes; China (Zhejiang)......... ............................................................................................................................. N (N.) montanus Zhou and Wu 1992   
- Shoulder of anterior hamulus is virually absent but there is a gradually curved shoulder below the curved hook; synthorax with yellow dorsal stripes not conjoined........................................................................................................... 9  
 9 Black labrum; synthorax with yellow dorsal stripes separated forming a pair of 7's, left side ‘7’ inverted; subgenital plate with a broad, shallow notch (Figs. 22a–g); China (Fujian, Hunan)........................... N (N.) lieftincki Chao 1954   
 - Labrum black with a transverse yellow stripe invaded at basal centre; synthorax with very broad yellow dorsal stripes narrowly seperated centrally; Japan........................................................................ N (N.) viridis Oguma 1926   
 10 Antehumeral stripe present as very short fine stripe; anterior hamulus with a prominent shoulder at right angles to shaft of hook; China (Fujian)............................................................................................ N (N.) bequaerti Chao 1954   
- Antehumeral stripe absent.......................................................................................................................................... 11  
 11 Labrum entirely black; anterior hamulus with a short 90º shoulder and large scythe-like hook; distal segment of penile organ with lateral spines; inferior appendages divaricate; China (Guangxi)....................................................... .............................................................................................................................. N (N.) huangshaenensis Chao 1999   
- Labrum black with a yellow transverse stripe............................................................................................................ 12  
 12 Synthorax with broad yellow, distinctly 7-shaped dorsal stripes, left side ‘7’ inverted; anterior hamulus with a short 90º shoulder and large scythe-like hook; distal segment of penile organ without lateral spines; China (Fujian).................................................................................................................................................... N (N.) simillimus Chao 1982   
- Synthorax with broad yellow dorsal stripes not distinctly 7-shaped.......................................................................... 13  
 13 Anterior hamulus with an acutely pointed protruded shoulder; distal segment of penile organ without lateral spines; superior appendage ventrally downturned at tip; China (Zhejiang)...................... N (N.) silvanus Zhou and Wu 1992   
 - Anterior hamulus with a thumb-like protruded shoulder; distal segment of penile organ with lateral spines; superior appendage not ventrally downturned at tip; China (Zhejiang).................................. N (N.) chaoi Zhou and Wu 1992   
14 Labrum, clypeus, and antefrons entirely yellow......................................................................................................... 15  
- Labrum, clypeus, or antefrons with some black markings......................................................................................... 16  
 15 Antehumeral stripe complete; anterior hamulus with narrow shaft, without a shoulder and small hook; subgenital plate deep with an acutely angled (ca 45º) v-shaped notch; China (Hebei, Jiangsu, Sichuan)....................................... .............................................................................................................................. N (L.) brevipennis (Needham 1930)   
 - Antehumeral stripe present with isloated superior spot; anterior hamulus hooked with a distinct, sharply pointed shoulder but not significantly protruded; subgenital plate fairly deep with an acutely angled (slightly less 90º), ushaped notch; superior appendages with small protrusions at elbows; China (Henan).................................................. ............................................................................................................. N (L.) cultratus Chao and Wang in Chao 1990   
16 Superior appendages of male with a rounded apex at elbow, when viewed both dorsally and ventrally................... 17  
 - Superior appendages of male with a distinct protrusion at apex of elbow, especially noticeable when viewed ventrally; antehumeral stripe absent with an isolated superior spot; subgenital plate with vulvar scales narrowly divided, sharply pointed, triangular scales; dorsum of synthorax with 7-shaped yellow stripes; China (Fujian)........................ ...................................................................................................................................... N (L.) shaowuensis Chao 1954   
 17 Inferior appendages widely divaricate; superior appendages with bifid tips; subgenital plate with widely angled (equal to or slightly more than 90º) v-shaped notch; China (Qinghai), Korea, Russia. ............................................................................................................................................................................ N (L.) ruptus (Selys and Hagen 1858)   
 - Not as above; Korea.................................................................................................................. N (L.) minor Doi 1943
description: Published as part of Wilson, Keith Duncan Peter & Xu, Zaifu, 2009, Gomphidae of Guangdong & Hong Kong, China (Odonata: Anisoptera) 2177, pp. 1-62 in Zootaxa 2177 on pages 45-46