Key to Arabian Crematogaster

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This worker key is based on: 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 (doi:10.3897/zookeys.898.37531).

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1

Sharaf et al 2019. Figure 1. A Postpetiole of C. gryllsi sp. nov. in dorsal view, CASENT0919794 (Michele Esposito) B postpetiole of C. chiarinii in dorsal view, CASENT0263878 (Will Ericson) C propodeum of C. inermis in profile, CASENT0922679 (Wade Lee) D propodeal spines of C. chiarinii in profile, CASENT0263878 (Will Ericson) E mesosoma of C. inermis in profile, KG01956A (Michele Esposito) F mesosoma of C. jacindae in profile CASENT0922856 (Michele Esposito), www.AntWeb.org.
Sharaf et al 2019. Figure 2. A Head of C. aegyptiaca in full-face view, CASENT0916082 (Anna Pal) B head of C. oasium in full-face view, CASENT0249821 (Ryan Perry) C mesosoma of C. aegyptiaca in profile, CASENT0916082 (Anna Pal) D propodeal spines of C. chiarinii in profile, CASENT0263878 (Will Ericson) E head of C. chiarinii in full-face view, CASENT0263878 (Will Ericson) F head of C. mimosae in full-face view,CASENT0904507 (Will Ericson), www.AntWeb.org.
Sharaf et al 2019. Figure 3. A Head of C. senegalensis in full-face view, CASENT0104592 (April Nobile) B head of C. flaviventris in full-face view, CASENT0912651 (Will Ericson) C head of C. melanogaster in full-face view, CASENT0904511 (Will Ericson) D mesosoma of C. melanogaster in profile, CASENT0904511 (Will Ericson) E head of C. auberti in full-face view, CASENT0908480 (Zach Lieberman) F mesosoma of C. auberti in profile, CASENT0904499 (Will Ericson), www.AntWeb.org.
Sharaf et al 2019. Figure 4. Petiole of C. antaris in dorsal view, CASENT0903658 (Will Ericson) B petiole of C. jehovae in dorsal view, CASENT0908475 (Zach Lieberman) C postpetiole of C. laestrygon in dorsal view, CASENT0912691 (Zach Lieberman) D postpetiole of C. jehovae in dorsal view, CASENT0908475 (Zach Lieberman), www.AntWeb.org.
Crematogaster gryllsi C.jpg
Crematogaster gryllsi A.jpg

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
Crematogaster inermis casent0922679 h 1 high.jpg
Crematogaster inermis casent0922679 p 1 high.jpg
  • 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
Crematogaster jacindae C.jpg
Crematogaster jacindae B.jpg

4

return to couplet #2

Crematogaster delagoensis casent0908517 h 1 high.jpg
Crematogaster delagoensis casent0908517 p 1 high.jpg

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
Crematogaster aegyptiaca casent0172823 head 1.jpg
Crematogaster aegyptiaca casent0172823 profile 1.jpg
  • 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
Crematogaster mimosae casent0904507 h 1 high.jpg
Crematogaster mimosae casent0904507 p 1 high.jpg
  • 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
Crematogaster acaciae casent0908494 h 1 high.jpg
Crematogaster acaciae casent0908494 p 1 high.jpg
  • 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
Crematogaster affabilis casent0263878 h 1 high.jpg
Crematogaster affabilis casent0263878 p 1 high.jpg

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
Crematogaster senegalensis casent0104592 head 1.jpg
Crematogaster senegalensis casent0104592 profile 1.jpg
  • 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
Crematogaster flaviventris casent0193696 h 1 high.jpg
Crematogaster flaviventris casent0193696 p 1 high.jpg

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
Crematogaster melanogaster casent0904511 h 1 high.jpg
Crematogaster melanogaster casent0904511 p 1 high.jpg
  • 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
Crematogaster auberti casent0281539 h 1 high.jpg
Crematogaster auberti casent0281539 p 1 high.jpg

13

return to couplet #11

Crematogaster striaticeps C.jpg
Crematogaster striaticeps A.jpg
  • 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
Crematogaster oasium casent0249820 h 1 high.jpg
Crematogaster oasium casent0249820 p 1 high.jpg
  • 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
Crematogaster antaris casent0249872 h 1 high.jpg
Crematogaster antaris casent0249872 p 1 high.jpg
  • 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
Crematogaster laestrygon casent0281538 h 1 high.jpg
Crematogaster laestrygon casent0281538 p 1 high.jpg
  • Postpetiole little broader than long in dorsal view; color red-brown (Fig. 4D) . . . . . Crematogaster jehovae
Crematogaster jehovae casent0281540 h 1 high.jpg
Crematogaster jehovae casent0281540 p 1 high.jpg