Bothroponera pumicosa

Bothroponera are recognized by their behavior in that they build small colonies under stones in moist clay soils. They are mainly specialized to feed on termites (Wheeler, 1922; Wheeler and Wheeler, 1971). Specimens of this species have been found in grassland and karro.

Identification
Joma and Mackay (2015) - The worker of Bothroponera pumicosa is characterized by a large total length (11- 12 mm). The main distinguishing character of the B. pumicosa worker is the long (up to 0.50 mm or more) golden hairs that are distributed on the entire body including the mandibles, clypeus, and legs. The hairs on the scape are long, at least as long as greatest diameter of the scape. The mandibles are hairy and smooth. The anterior medial margin of the clypeus is convex, “u” shaped, with a raised smooth medial clypeal area on the lower part and is partially carinate on the upper part between the frontal lobes. The lower part of the medial raised area tends to form a groove. The scape does not reach the posterior lateral corner of the head.

The worker of B. pumicosa has a similar “u” shaped anterior margin of the clypeus as those of Bothroponera strigulosa, Bothroponera cariosa, Bothroponera berthoudi, and Bothroponera laevissima. The upper part of the raised area of the clypeus forms a partial carina while it forms a complete longitudinal sharp carina in both B. strigulosa and B. cariosa, but B. berthoudi, and B. laevissima lack the carina. The long hairs (up to 0.50 mm or more) separate B. pumicosa from all of the other members of the B. pumicosa species complex. The hair length of the other B. pumicosa species complex species is less than 0.20 mm for the head; less than 0.25 mm for the pronotum, mesonotum, and propodeum; and less than 0.35 mm for the petiole and postpetiole. The traits of B. pumicosa are very similar to those of B. berthoudi and B. strigulosa, but it can be separated by the longer hairs and the form of the anterior medial border of the clypeus.

Distribution based on Regional Taxon Lists
Afrotropical Region: South Africa.

Nomenclature

 *  pumicosa. Ponera pumicosa Roger, 1860: 290 (w.) SOUTH AFRICA. Forel, 1901f: 344 (m.); Wheeler, G.C. & Wheeler, J. 1971c: 390 (l.). Combination in Bothroponera: Mayr, 1862: 717; in Pachycondyla (Bothroponera): Emery, 1901a: 45; in Bothroponera: Wheeler, W.M. 1922a: 72; in Pachycondyla: Brown, in Bolton, 1995b: 308; in Bothroponera: Joma & Mackay, 2013: 3; Schmidt & Shattuck, 2014: 76. Current subspecies: nominal plus sculpturata. See also: Arnold, 1915: 62.

Worker
Joma and Mackay (2015) - (n=5), HL 2.50 - 2.75, HW 2.05 - 2.15, ML 1.30 - 1.40, EW 0.30 - 0.35, EL 0.40, SL 1.75 - 1.80, FL 2.35 - 2.60, WL 3.25 - 3.70, WPL 4.10 - 4.30, PL 1.00, PW 1.20 - 1.25, PH 1.00 - 1.55, CI 82.00 - 78.18, OI 19.51 - 18.60, MandI 51.00 - 52.00, SI 81.39 - 85.36, PetI 120 – 125. Head subquadrate; mandibles with about 8 teeth, covered with hair (0.20 mm in length); maximum clypeal length 1.85 - 2.00 mm; scape not reaching posterior lateral corner of head; maximum frontal lobes width 0.90 - 0.95 mm; frontal furrow well developed; length of malar space from lower edge of eye to base of mandible 0.50 mm; length from upper edge of eye to edge of posterior lobe 1.20 mm; frontal furrow well developed; lower margin of pronotum straight with anteropronotal area forming strongly curved angle, rounded inferior pronotal angle; basalar sclerite oval shaped; mesometapleural suture developed; anterior face of petiole from dorsal view rounded, slightly narrowed, posterior face vertical, slightly concave posteriorly (side view); posterior edge of petiole with slight depression (seen from above); mandibles shiny; antennae, legs, edges of frontal lobes, surface of head densely punctate; pronotum, mesonotum, propodeum, lateropropodeum, and metapleuron densely foveolate; mesopleuron rough with few scattered punctae and foveolae; petiolar and postpetiolar surfaces covered with larger foveolae than those of mesosoma; postpetiolar dorsum partially covered with striae; dorsum of second segment of gaster covered with shallower foveolae than those of petiole and postpetiole, covered with large striae; gastral segments rough, shiny; long golden hairs (up to 0.50 mm or more) distributed on entire body including mandibles, clypeus, legs; hairs on scape long, at least as long as greatest diameter of scape; erect and suberect hairs on body surface as following: head, funiculus, mandibles with long hairs (0.20 mm), hairs on scape about 0.20 mm on far end, about 0.40 mm on near area of scape’s base, hairs on legs about 0.25 - 0.30 mm, on pronotum, mesonotum, propodeum (0.40 - 0.45 mm), on petiole, postpetiole, entire gaster (0.50 - 0.55 mm); head, pronotum, mesonotum, mesopleuron, propodeum, petiole, postpetiole, entire gaster black; femora, mandibles brownish black; tibia, tarsi, antennae, edges of frontal lobes brown.

Type Material
Joma and Mackay (2015) - South Africa: Kaffernlande, Transkei District, 31°30’0’’ S; 29°0’0’’ E, Bothroponera pumicosa type (Roger, 1860) (1 w holotype, #11522.) SAM-ENT (Iziko).