Key to Afrotropical species of Proceratium arnoldi clade

This worker key is based on: [[Media:Proceratium carri Zookeys paper.pdf|Hita Garcia, F.; Hawkes, P. G.; Alpert, G. D. 2014. Taxonomy of the ant genus Proceratium Roger (Hymenoptera, Formicidae) in the Afrotropical region with a revision of the P. arnoldi clade and description of four new species. ZooKeys 447:47–86. PDF]]

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 * Proceratium
 * Proceratium Species Groups

1

 * No maculae present on vertexal angles of head (Fig. 3A); abdominal segment IV relatively long, around 1.6 times longer than abdominal segment III (ASI 156–159) (Fig. 3D) [Mozambique] . . . . . Proceratium carri


 * Maculae on vertexal angles of head present and usually very conspicuous, but sometimes difficult to see (Fig. 3B, 3C); abdominal segment IV always conspicuously shorter than above, between 1.0 to 1.3 times longer than abdominal segment III (ASI 102–132) (Fig. 3E, F) . . . . . 2

2
return to couplet #1
 * Eyes absent (OI 0) (Fig. 4A) [Tanzania] . . . . . Proceratium nilo


 * Eyes variable in size, but always present (OI 3–8) (Fig. 4B, C) . . . . . 3

3
return to couplet #2
 * Eyes larger (OI 8) (Fig. 5A); ventral process of petiole with posteroventral corner conspicuously projecting ventrally, almost spiniform (Fig. 5D) [Burundi] . . . . . Proceratium burundense


 * Eyes always smaller (OI 3–5) (Fig. 5B, C); ventral process of petiole usually more or less rectangular without posteroventral corner conspicuously projecting ventrally, rarely posteroventral corner weakly pointing posteroventrally, but distinctly less conspicuously than above (Fig. 5E, F) . . . . . 4

4
return to couplet #2
 * Head, mesosoma and petiole with numerous long, fine, suberect to erect hairs on top of dense mat of much shorter decumbent to subdecumbent pubescence (Fig. 6A, B) . . . . . 5


 * Head, mesosoma and petiole with mat of short decumbent to subdecumbent pubescence only, without numerous longer, fine suberect to erect hairs (Fig. 6C), sometimes parts of pubescence on mesosoma suberect to erect (Fig. D) . . . . . 6

5
return to couplet #4
 * Petiolar node in profile appearing thicker and stouter, with lower third of anterior face strongly produced anteriorly (Fig. 7A) [Kenya] . . . . . Proceratium sokoke


 * Petiolar node higher and thinner than above, more strongly anteroposteriorly compressed, with anterior face relatively straight (Fig. 7B) [Tanzania] . . . . . Proceratium sali

6
return to couplet #4
 * Head relatively longer (CI 85–87) (Fig. 8A); surface sculpture weak and superficial; body colouration yellow to very light brown (Fig. 8B) [South Africa, Zimbabwe] . . . . . Proceratium arnoldi


 * Head relatively shorter (CI 92–95) (Fig. 8C); surface sculpture better developed, usually deeply foveolate; body colouration of darker brown than above (Fig. 8D) [Cameroon, Gabon and Uganda] . . . . . Proceratium lunatum