Key to Bothroponera sulcata species complex

This key is based on Joma & MacKay (2017)

1
sometimes slightly inflated; dorsopropodeum curved or forming slight or sharp obtuse angle with posteropropodeum, which is flat or slightly concave, with or without slight medial depression seen from above or from posterior side; margins between latero- and posteropropodeum sometimes forming granulated and carinated edges; commonly collected and widely distributed .....2
 * Lateropropodeum (side view) strongly compressed, distinctly concave as seen from above; dorsopropodeum narrowed, about ½ width of remainder of propodeum, slightly curved posteriorly, margins of posteropropodeum not forming granulated or carinated edges, but distinctly angulate with lateropropodeum; posteropropodeum flat, without depression; rarely collected, known only from Eritrea and Kenya .....Bothroponera crassa
 * Lateropropodeum (side view) not compressed, or slightly concave, dorsopropodeum about as wide as width of posteropropodeum,

2
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 * Mandibles striated, rough, sometimes with scattered elongate punctures.....3
 * Mandibles smooth, shiny, sometimes only moderately shining.....5

3
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 * Larger body length (TL 9 -13 mm); shaft of scape with more than 20 nearly completely erect hairs; collected from Kenya, Zimbabwe and South Africa.....Bothroponera kruegeri
 * Smaller body length (TL 6 9.5 mm); shaft of scape with fewer than 20 nearly erect hairs; widely distributed.....4

4
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 * Surface sculpture rough without punctures; clypeus with wide shallow groove on raised longitudinal area of anterior medial area; usually without or with few erect hairs on posterior tibia; male with well-developed notauli; rarely collected, Kenya, Somalia and Tanzania.....Bothroponera notaula
 * Surface sculpture rough with strong evidence of punctures; clypeus without groove, or slightly narrowed groove present on raised longitudinal area of clypeus; generally with many suberect hairs on posterior tibia; male without or with poorly developed notauli; very common, eastern countries of Africa including Eritrea, Somalia, Ethiopia, Kenya and Zimbabwe .....Bothroponera crassior

5
return to couplet 2 hairs ranging in length from 0.20 to 0.36 mm; Gabon and Cameroon.....Bothroponera pilosuperficia
 * Surface of head covered with moderately long (up to 0.5 mm on clypeus, 0.3 mm on posterior border of head) erect silver hairs, surface of pronotum, propodeum, petiole, postpetiole and 4th to 7th abdominal segments covered with abundant erect and suberect
 * Surface of head bare, lacking or nearly lacking erect hairs, possibly few relatively short hairs on posterior border or on frons, surface of pronotum, propodeum, petiole, postpetiole and 4th to 7th abdominal segments covered with or without moderately long erect hairs, range in length from 0.15 to 0.30 mm; widely distributed .....6

6
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 * Head without erect hairs, surface ofpronotum, propodeum, petiole, postpetiole and 4th to 7th abdominal segments bare; rarely collected, known from Angola.....Bothroponera picardi
 * Head usually with few hairs on posterior border or on frons, surface of pronotum, propodeum, petiole, postpetiole and 4th to 7th abdominal segments covered with moderately long erect hairs.....7

7
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 * Total length nearly always greater than 7 mm; anterior medial area of clypeus partially or completely striated; common, widespread species, collected from Guinea, Ivory Coast, Ghana, Cameroon, Gabon, Congo Brazzaville, Congo (DRC), Angola, Ethiopia, Kenya, Burundi and Mozambique.....Bothroponera soror
 * Total length nearly always less than 7 mm; anterior medial area of clypeus, not striated,forming shiny, smooth longitudinal narrowed strip with slight groove in some specimens or with weak evidence of fine striae in others; widespread but rarely collected.....8

8
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 * Eye large, about 0.3 mm in maximum diameter, approximately as long as distance to anterior edge of head; head lacking of erect hairs, surface of pronotum, propodeum, petiole, postpetiole and 4th to 7th abdominal segments covered with few moderately long scattered erect hairs; rarely collected, Guinea and Nigeria.....Bothroponera ryderae
 * Eye smaller, up to 0.2 mm in greatest diameter, shorter than distance to anterior edge of head; head usually with at least few hairs, with hairs on posterior border, surface of pronotum, propodeum, petiole, postpetiole and 4th to 7th abdominal segments covered with moderately long erect hairs.....9

9
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 * Smaller, total length (5 - 6 mm); MandI 45.45 - 60.00; Cameroon, Ghana, Guinea, Ivory Coast Nigeria, Kenya and Tanzania.....Bothroponera silvestrii
 * Larger total length (6 - 7 mm); MandI 58.62 - 64.70; widespread, Congo Brazzaville, Gabon, Kenya, Mozambique and Tanzania.....Bothroponera ancilla