Key to Stenamma westwoodii species-group queens of Western Europe and North African

This key to queens is based on: [[Media:Rigato 2011.pdf| Rigato, F. 2011. Contributions to the taxonomy of West European and North African Stenamma of the westwoodii species-group. (Hymenoptera Formicidae). Memorie della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale di Milano. 37:1-56.]]

Queens are not known for Stenamma zanoni

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Stenamma

1

 * Size larger (TL > 5.0, HL > 1.00) with longer appendages (SI and TI > 100); scape distinctly surpassing the posterior margin of the head when laid back. Scapes and tibiae with several standing hairs, besides the usual pubescence . . . . . Stenamma petiolatum


 * Size smaller  (usually TL  ≤  5.0  and HL  ≤  1.00)  with shorter appendages (SI ≤ 100, TI < 100); scape at most just reaching the posterior margin of the head when laid back. Scapes and tibiae with appressed to decumbent pubescence only . . . . . 2

2
return to couplet #1
 * Size smaller (TL < 4.0, HL ≤ 0.80); head rugulation finer and more regularly longitudinal (Fig. 49) . . . . . Stenamma striatulum


 * Size larger (TL ≥ 4.0, HL > 0.80); head surface mostly areolate (e.g. Figs. 44, 46) . . . . . 3

3
return to couplet #2
 * SI < 85. Colour usually darker, brown . . . . . Stenamma debile


 * SI > 85, mostly ≥ 90. Colour usually paler, ferrugineous . . . . . 4

4
return to couplet #3
 * Postpetiole in profile higher and stouter, about as high as long (PPL≈PPH) . . . . . 5


 * Postpetiole in profi le lower and more slender, distinctly longer than high (PPL>PPH) . . . . . 7

5
return to couplet #4
 * PCI < 25 . . . . . Stenamma westwoodii


 * PCI > 30 . . . . . 6

6
return to couplet #5
 * Colour ferrugineous; SI >  90; petiolar sternite shallowly concave in profile  . . . . . Stenamma africanum


 * Colour brown; SI < 90; petiolar sternite fully straight in profile . . . . . Stenamma msilanum

7
return to couplet #4
 * Scape reaching the posterior margin of the head when laid back (SI > 95) and with some standing hairs along its dorsal side (Fig. 48) . . . . . Stenamma siculum


 * Scape not reaching the posterior margin of the head when laid back (SI < 95) and with no standing hairs along its dorsal side . . . . . Stenamma sardoum