Trichomyrmex almosayari

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Trichomyrmex almosayari
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Trichomyrmex
Species: T. almosayari
Binomial name
Trichomyrmex almosayari
Sharaf & Aldawood, 2016

Trichomyrmex almosayari casent0914921 p 1 high.jpg

Trichomyrmex almosayari casent0914921 d 1 high.jpg

Specimen Labels

Sharaf et al. (2016) - This species was found foraging on dry sandy soil surrounding shrubs of Rhazya stricta Decnet (Apocynaceae) in Rawdhat Khorim, one of the most important natural protectorates in Saudi Arabia due to its diverse flora (Al-Farraj et al. 1997, Alfarhan 2001).


Sharaf et al. (2016) - Trichomyrmex almosayari can be immediately separated from all known African and Arabian species of the genus by the reniform eyes, the ventral eye margin feebly concave and the dorsal eye margin distinctly broadly convex.

Keys including this Species


Distribution based on Regional Taxon Lists

Afrotropical Region: Saudi Arabia (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb




The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • almosayari. Trichomyrmex almosayari Sharaf & Aldawood, in Sharaf, Salman et al. 2016: 12, figs 6A-C (w.) SAUDI ARABIA.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.



Holotype. TL 2.60; HL 0.75; HW 0.67; SL 0.55; EL 0.20; ML 0.77; PW 0.40; PTL 0.22; PTW 0.12; PPL 0.15; PPW 0.17; CI 89; SI 82. Paratypes. TL 2.62–2.92; HL 0.70–0.75; HW 0.67–0.72; SL 0.52–0.60; EL 0.17–0.20; ML 0.75–0.80; PW 0.37–0.42; PTL 0.15–0.22; PTW 0.12; PPL 0.12–0.15; PPW 0.15–0.17; CI 93–96; EI 25–28; SI 74–90 (n = 5).

Head. Head short, only slightly longer than broad (CI 93–96), with feebly convex sides and emarginated posterior margin; anterior clypeal margin lacking teeth of any description; masticatory margin of mandibles armed with three teeth; eyes relatively large, with 12 ommatidia in the longest row (EL 0.25–0.27 × HW), reniform with ventral margin weakly but distinctly concave, dorsal margin distinctly broadly convex; scapes short, when laid back from their insertions failing to reach posterior margin of head (SI 74–90).

Mesosoma. Promesonotum strongly convex, descending evenly to a much lower, shallowly but distinctly impressed metanotal groove; propodeal spiracles circular.

Pilosity. Underside of head with crowded, long J-shaped ammochaete hairs forming a psammophore; two pairs of hairs on pronotum and mesonotum, propodeum bare, petiole and postpetiole each with one pair of long hairs, gaster with decumbent pubescence; cephalic pilosity shorter than body pilosity.

Sculpture. Mandibles longitudinally striolate; cephalic dorsum smooth and shining, except for scattered hair pits; area in front of eyes and behind posterior clypeal margin finely striolate; pronotal dorsum faintly shagreenate; mesosomal dorsum, sides, petiole and postpetiole finely and densely punctulate or shagreenate, general appearance dull; gaster smooth and polished.

Color. Dark brown to blackish brown; mandibles, antennae, and legs brownish.

Type Material

Holotype. SAUDI ARABIA: w, Riyadh Province, Rawdhat Khorim, 25.38˚ N, 47.27˚ E, alt. 574 m, 9 Jan. 2015, S. Salman leg. (King Saud Museum of Arthropods). Paratypes. SAUDI ARABIA: 4 w, same data as holotype (KSMA); 1 w, same data as holotype (California Academy of Sciences); 3 w, same data as holotype (KSMA, 1 without gaster); 5 workers, Riyadh Province, Rawdhat Khorim, 25.38˚ N, 47.27˚ E, alt. 618 m, 2 Jun. 2013, S. Salman leg. (KSMA); 1 w, Riyadh Province, Al Zulfi, Rawdhat Al Sabalah, 26.36˚ N, 44.98˚ E, alt. 670 m, 25 Oct. 2015, Aldhafer et al. leg. (World Museum, Liverpool).


The patronym almosayari has been selected to honor the late Egyptian Islamic writer Dr. Mohammed Sayed Almosayar (1948-2008).


References based on Global Ant Biodiversity Informatics

  • Sharaf M. R., S. Salman, H. M. Al Dhafer, S. A. Akbar, M. S. Abdel-Dayem, A. S. Aldawood. 2016. Taxonomy and distribution of the genus Trichomyrmex Mayr, 1865 (Hymenoptera: Formicidae) in the Arabian Peninsula, with the description of two new species. European Journal of Taxonomy 246: 1–36