Key to Arabian Crematogaster

This worker key is based on: [[Media:Sharaf, M.R., Aldawood, A.S. et al. 2019. Review of the Arabian Crematogaster (10.3897@zookeys.898.37531).pdf|Sharaf, M.R., Aldawood, A.S., Hita Garcia, F. 2019. Review of the Arabian Crematogaster Lund (Hymenoptera, Formicidae), synoptic list, distribution, and description of two new species from Oman and Saudi Arabia. ZooKeys 898: 27–81]].

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 * Crematogaster
 * Ants of Saudi Arabia

1

 * Postpetiole not bilobed dorsally (Fig. 1A). . . . . Crematogaster gryllsi


 * Postpetiole bilobed dorsally (Fig. 1B) . . . . . 2

2
return to couplet #1


 * Propodeal spines completely absent (Fig. 1C) . . . . . 3


 * Propodeal spines present, ranging from small denticles to long (Fig. 1D) . . . . . 4

3
return to couplet #2


 * Unicolorous yellow-brown to brown species; cephalic surface including area in front of eyes unsculptured; eyes with ca. 14 ommatidia in longest row; posterior half of clypeus with fine appressed pubescence; mesonotum in profile with a small tubercle close to promesonotal suture; mesopleura and metapleura longitudinally striated; mesonotum without hairs; propodeal spiracles circular (Fig. 1E) . . . . . Crematogaster inermis


 * Bicolored species, head black-brown or black, mesosoma, petiole and postpetiole dark brown, relatively lighter than head, gaster golden yellow; area in front of eyes finely longitudinally striated; cephalic surface feebly imbricate; eyes with ca. 11 ommatidia in longest row; posterior half of clypeus without hairs or pubescence; mesonotum in profile without tubercle; mesopleura and metapleura distinctly densely imbricate; mesonotum with a single pair of hairs; propodeal spiracles slit-shaped, gaster golden yellow (Fig. 1F). . . . . Crematogaster jacindae

4
return to couplet #2


 * Propodeal spines reduced to a small denticle . . . . . Crematogaster delagoensis


 * Propodeal spines well developed . . . . . 5

5
return to couplet #4


 * In full-face view, antennal scapes short, clearly not reaching posterior margin of head (Fig. 2A) . . . . . 6


 * In full-face view, antennal scapes longer, clearly reaching or surpassing posterior margin of head (Fig. 2B) . . . . . 9

6
return to couplet #5


 * Propodeal spines short and blunt, approx. as long as their bases in profile; antennal fossae surrounded by curved striolae in full-face view (Figs. 2A, 2C) . . . . . Crematogaster aegyptiaca


 * Propodeal spines long and acute, distinctly longer than their bases in profile; antennal fossae surrounded by longitudinal striolae in full-face view (FigS. 2D, 2E) . . . . . 7

7
return to couplet #5


 * Body distinctly opaque; cephalic surface completely densely longitudinally rugulose; head, mesosoma, petiole and postpetiole reddish (Fig. 2F) . . . . . Crematogaster mimosae


 * Body shining; only area in front of eyes faintly longitudinally rugolose; head, mesosoma, petiole and postpetiole uniform yellow or brown . . . . . 8

8
return to couplet #7


 * Body uniform yellow; head, in full-face view, with feebly-defined frontal triangle and without longitudinal carina; postpetiole in dorsal view broader posteriorly than anteriorly; propodeum dorsum seen from above longitudinally striated . . . . . Crematogaster acaciae


 * Head, petiole, postpetiole and gaster dark brown, mesosoma light brown; head, in full-face view, with well-defined frontal triangle and posterior longitudinal carina reaching posterior margin of eyes; propodeum dorsum seen from above transversally striated; postpetiole in dorsal view as broad as anteriorly and posteriorly . . . . . Crematogaster chiarinii

9
return to couplet #5


 * Antennal scapes when laid back from their insertions just reach posterior margin of head in full-face view . . . . . 10


 * Antennal scapes when laid back from their insertions clearly surpassing posterior margin of head in full-face view . . . . . 11

10
return to couplet #9


 * Unicolorous brown species; clypeus smooth; anterior half of head in full-face view longitudinally striated, ground surface between striae smooth; posterior half of head smooth, general appearance of head shining (Fig. 3A) . . . . . Crematogaster senegalensis


 * Bicolored species, head, mesosoma, petiole, postpetiole and appendages brown or red-brown, gaster golden yellow; clypeus longitudinally striated; anterior half of head in full-face view finely longitudinally striated, grown surface between striae and posterior half of head finely densely punctate; general appearance of head dull (Fig. 3B) . . . . . Crematogaster flaviventris

11
return to couplet #9


 * Mesonotum in profile without a small tubercle close to promesonotal suture . . . . . 12


 * Mesonotum in profile with a small tubercle close to promesonotal suture . . . . . 13

12
return to couplet #11


 * Whole cephalic surface finely, densely longitudinally striated and dull; head in full-face view with antennal scapes surpassing posterior margin of head byapproximate length of the three funicular segments together; propodeal spines long and acute, more than twice longer than bases; mesonotum in profile feebly convex; subpetiolar process well developed; mesosomal hairs numerous, five on promesonotum, two on pronotum, and a single pair on the propodeum (FigS. 3C, 3D) . . . . . Crematogaster melanogaster


 * Anterior half of cephalic surface superficially striated, posterior half smooth and shining; head in full-face view with antennal scapes surpassing posterior margin of head by ca. thickness of the first funicular segment; propodeal spines shorter and blunt, ca. 1.5× longer than bases; mesonotum in profile strongly convex; subpetiolar process absent; mesosomal hairs restricted to a single pair on pronotum (FigS. 3E, 3F) . . . . . Crematogaster auberti

13
return to couplet #11


 * Cephalic surface and clypeus completely finely densely longitudinally striated . . . . . Crematogaster striaticeps


 * Anterior half of cephalic surface or at least area in front of eyes and clypeus longitudinally striated . . . . . 14

14
return to couplet #13


 * Promesonotum with at least four pairs of suberect hairs; petiole in dorsal view with pointed anterior corners; first gastral tergite with several pairs of hairs (ca. 7 pairs) . . . . . Crematogaster oasium


 * Promesonotum with a single pair of hairs or without hairs; petiole in dorsal view with rounded anterior corners; hairs on first gastral tergites rare, restricted to few pairs on posterior margin of the tergite . . . . . 15

15
return to couplet #14


 * Petiole in dorsal view with concave anterior margin; promesonotum and mesonotum dorsum unsculptured (Fig. 4A) . . . . . Crematogaster antaris


 * Petiole in dorsal view with a straight anterior margin; promesonotum and mesonotum dorsum distinctly longitudinally striated (Fig. 4B) . . . . . 16

16
return to couplet #15


 * Postpetiole approx. twice broader than long in dorsal view; color black-brown or dark brown (Fig. 4C) . . . . . Crematogaster laestrygon


 * Postpetiole little broader than long in dorsal view; color red-brown (Fig. 4D) . . . . . Crematogaster jehovae