Nigeria specimens (as Tetramorium species
T¹, Taylor, 1980a: 55). WORKER. TL 2.86 mm, HL 0.67, HW 0.61, SL 0.56,
Superficially similar to Tetramorium
lucayanum, but with a smaller eye, and the margin of the
alitrunk not clearly defined. Sculpturation of the head, alitrunk and
pedicel more reticulate and less rugose. Clypeus very convex, with a
pronounced medial carina, projecting slightly on the anterior margin.
Propodeal spines long, acute and triangular pointing upwards;
metapleural lobes fairly large, upward pointing triangles. Petiole with
a more rounded anterior face. Colour dark red-brown.
Bolton (1980) described the holotype worker and 6
paratype workers from Nigeria, at IITA (B.R. Critchley,
16-23.ix.1974), other findings from Mokwa (B. Labesikan) and Ile Ife
(J.T. Medler). Nests in the soil and in dead wood on the ground and
forages on the wood. Also at the Cocoa Research Institute of Nigeria,
Idi Ayunre, collected by B. Bolton and myself. I found it on a cocoa
trunk at 100 cm above ground, perhaps tending Homoptera; also on
rotting blackwood at Block E6/1.
Listed by Bolton (1980) from Ghana at Mampong,
Legon, Kibi, Mt. Atewa (D. Leston), Mampong (P.M. Room) and CRIG (B.
Bolton). Since described as widespread from their leaf litter
collections (140 workers plus 4 from soil samples, at 11 sites) in the
semi-deciduous forest zone, by Belshaw & Bolton (1994b).
Curiously, although under Tetramorium
angulinode Bolton outlined at some length how he had
established specimens collected in Guinea by Lamotte and
thought by Bernard (1952) to be of "Tetramorium humerosum"
actually were of this species, he (Bolton) made no reference to the
story under ataxium. The Guinea records given by Bernard (1952)
were all from Mt. Nimba by Lamotte - several workers (TL 2.2-3.0) from
each of Kéoulenta, savanna (common); station B8.8, N'Zo; also 4 alate
queens from station B8.8 (TL 3.7-4.0). They can now be seen on
Antweb at http://www.antweb.org/specimenImages.do?code=casent0914276
Bernard also defined a new bicoloured
subspecies "muscicola" of "humerosum" from N'Zo, these specimens
were assigned to Tetramorium
coloreum by Bolton.
Other countries, all West African, listed by Bolton
(1980) were Ivory Coast, at the Palmeraie de Lame (36 workers,
T. Diomande, 23.i.1976) and Lamto (J. Lévieux).