Key to Stigmatomma of China

This worker key is based on: Xu, Z. 2006. Three new species of the ant genera Amblyopone Erichson, 1842 and Proceratium Roger, 1863 (Hymenoptera: Formicidae) from Yunnan, China. Myrmecologische Nachrichten. 8:151-155.

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Stigmatomma

1

 * Antenna 11-segmented (see Terayama 1989: figs. 1-2) (China: Taiwan Province; Japan) . . . . . Stigmatomma sakaii


 * Antenna 12-segmented. . . . . . 2

2
return to couplet #1
 * Anterior margin of clypeus divided into three lobes, middle lobe with four denticles, lateral lobes each with two denticles (see XU 2001: figs. 11-13) (China: Yunnan Province) . . . . . Stigmatomma trilobum


 * Anterior margin of clypeus not divided into lobes . . . . . 3

3
return to couplet #2
 * Anterior margin of clypeus with 6-8 teeth. . . . . . 4


 * Anterior margin of clypeus with more than 10 teeth or denticles . . . . . 7

4
return to couplet #3
 * Anterior margin of clypeus with 6 teeth. . . . . . 5


 * Anterior margin of clypeus with 8 teeth. . . . . . 6

5
return to couplet #4
 * Anterodorsal corner of petiolar node rounded. Subpetiolar process triangular (see Wu and Wang 1992: fig. 4567) (China: Hunan Province . . . . . Stigmatomma rubiginoum


 * Anterodorsal corner of petiolar node bluntly angled. Subpetiolar process nearly rectangular (see ZHOU 2001: figs. 4-5) (China: Guangxi Region) . . . . . Stigmatomma eminia

6
return to couplet #4
 * Anterior face of petiolar node straight. Posteroventral corner of subpetiolar process bluntly angled (see Terayama 1990: figs. 3-4) (China: Zhejiang and Taiwan Provinces; Korea Peninsula, Japan) . . . . . Stigmatomma silvestrii


 * Anterior face of petiolar node weakly concave. Posteroventral corner of subpetiolar process acutely toothed (China: Yunnan Province) . . . . . Stigmatomma octodentatum

7
return to couplet #3
 * Anterior margin of clypeus straight, with 12 rectangular teeth, flanked by triangular corner tooth on each side (China: Taiwan Province) . . . . . Stigmatomma bruni


 * Anterior margin of clypeus weakly or strongly convex, with 10-12 minute triangular denticles. . . . . . 8

8
return to couplet #7
 * Eye with 100-120 facets. Total length 8 mm. Body in color brownish black (China: Macao; India) . . . . . Stigmatomma rothneyi


 * Eye with 18-19 facets. Total length 6.7-7.4 mm. Body in color black (see XU 2001: figs. 18-20) (China: Yunnan Province) . . . . . Stigmatomma crenatum