Ant fauna (Hymenoptera: Formicidae) of the Socotra Archipelago (Yemen): zoogeography, distribution and description of a new species Author Sharaf, Mostafa R. Author Fisher, Brian L. Author Collingwood, Cedric A. Author Aldawood, Abdulrahman S. text Journal of Natural History 2017 J. Nat. Hist. 2017-01-27 51 5 - 6 317 378 http://dx.doi.org/10.1080/00222933.2016.1271157 journal article 55739 10.1080/00222933.2016.1271157 f91a0e7b-c4c5-458a-858a-9de4cf82e13f 1464-5262 5184295 89612083-9CE6-48E8-8975-1CE5334E098B Key to species of Monomorium of Socotra (1) Dorsum of mesosoma without projecting hairs ( Figure 16 (a)) .......................................... 2 Dorsum of mesosoma with projecting hairs ( Figure 16 (b))................................................. 3 (2) 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 )................................. ................................. dichroum Forel 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 )......................................................... ......................................................... elghazalyi sp. nov . (3) Pilosity abundant and clubbed; antennae with 12 segments; eyes large with 10–11 ommatidia in the longest row; mandibles sculptured ( Socotra , Yemen )........................... ............................................................................................................................... nimihil Collingwood 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) Petiole node nearly as long as broad in dorsal view; petiole peduncle in profile without anteroventral process ( India , Bangladesh , Socotra ).................... atomum Forel 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 ))..................................................... ..................................................... exiguum Forel