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The Arabian Temnothorax Mayr, 1861 fauna is revised for the first time. Three species are recognized from the region: Temnothorax arabicus Sharaf & Akbar sp. nov., T. liviae (Agosti & Collingwood, 2011) comb. nov. and T. megalops (Hamann & Klemm, 1967). Leptothorax saudiae Collingwood & Agosti, 1996 was placed in Temnothorax by Bolton (2003), but actually belongs to Tetramorium Mayr, 1855 and is herewithin recombined to Tetramorium saudiae (Collingwood & Agosti, 1996) comb. nov. Automontage images and comparative diagnoses of workers as well as notes on habitats and distribution of treated species are provided. A revised key to the Arabian species based on the worker caste is also presented.
The ant genus Trichomyrmex Mayr, 1865 is revised for the Arabian Peninsula based on the worker caste. Nine species are recognized and descriptions of two new species, T. almosayari sp. nov. and T. shakeri sp. nov. from Riyadh Province, Saudi Arabia, are given. For nomenclatural stability, lectotypes for T. abyssinicus (Forel, 1894a), T. lameerei (Forel, 1902) and T. mayri (Forel, 1902) are designated. A key to species and diagnostic characters of the treated species are presented. New country records are presented for T. abyssinicus (Saudi Arabia), T. destructor (Jerdon, 1851) (Saudi Arabia and the United Arab Emirates) and T. mayri (Qatar). New distributional records for T. destructor and T. mayri for Saudi Arabia are also provided. World and regional species distributions are indicated and distributional maps for nine Arabian species are included. Ecological and biological information is given when known.