Key to Monomorium of Socotra

This worker key is based on: [[Media:Sharaf, M.R., Fisher, B.L. et al. 2017. Ant fauna of the Socotra Archipelago (Yemen) - zoogeography, distribution and description of a new species.pdf|Sharaf, M.R., Fisher, B.L., Collingwood, C.A., Aldawood, A.S. 2017. Ant fauna (Hymenoptera: Formicidae) of the Socotra Archipelago (Yemen): zoogeography, distribution and description of a new species. Journal of Natural History 51, 317–378 (DOI 10.1080/00222933.2016.1271157).]]

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 * Monomorium
 * Socotra Archipelago

1

 * Dorsum of mesosoma without projecting hairs (Figure 16(a)) . . . . . 2
 * Dorsum of mesosoma with projecting hairs (Figure 16(b)) . . . . . 3

2
return to couplet #1
 * Colour yellow with the area in front of eyes and gaster except first third of first gastral tergite blackish brown (Figure 16(c)); metanotal groove shallowly impressed (Figure 16(c)); eyes larger with seven ommatidia in the longest row (EL 0.21 × HW); cephalic surface finely and distinctly longitudinally striated (Figure 16(d)); sides of head straight or feebly convex; postpetiole in dorsal view about 1.7 times broader than petiole width (India, Socotra) . . . . . Monomorium sahlbergi


 * Unicolorous clear yellow; metanotal groove deeply impressed and broad (Figure 16 (e)); eyes smaller with five ommatidia in the longest row (EL 0.19 × HW); cephalic surface unsculptured smooth, and shining; lateral sides of head clearly convex; postpetiole in dorsal view about 1.2 times broader than petiole width (Socotra, Yemen) . . . . . Monomorium elghazalyi

3
return to couplet #1
 * Pilosity abundant and clubbed; antennae with 12 segments; eyes large with 10–11 ommatidia in the longest row; mandibles sculptured (Socotra, Yemen) . . . . . Monomorium nimihil


 * Pilosity few and simple; antennae with 11 segments; eyes smaller with four to six ommatidia in the longest row; mandibles unsculptured except for hair-pits, smooth and shining . . . . . 4

4
return to couplet #3
 * Petiole node nearly as long as broad in dorsal view; petiole peduncle in profile without anteroventral process (India, Bangladesh, Socotra) . . . . . Monomorium atomum


 * Petiole about 1.5 times broader than long in dorsal view; petiole peduncle in profile with a small anteroventral process (Afrotropical and Mediterranean regions, Arabian Peninsula (KSA)) . . . . . Monomorium exiguum