The Ants of Africa Genus Tetramorium species-groups - Part 4
Tetramorium Introduction

DIV3 SD2
Species groups - Part 4 - former Tetramorium (Tetramorium)
species with short antennal scapes and small eyes or larger eyes and squamiform petioles

DIV3 12-segmented antennae (Tetramorium)
Scape index < 100 (scape shorter than head width; usually does not reach occiput)
TD3 Eyes very small to minute; width less than maximum width of scape Otherwise tertiary division
shilohense-group	Diameter of eye usually < 0.17 X HW
Complex-1	With bizarre pilosity and irregular outline to alitrunk
26	Dorsum of head between frontal carinae with 3-5 very coarse rugae; flattened hairs on gaster scale-like; TL 3.1-3.5 mm; uniform brown	.	.
.		Tetramorium diomandei	Ivory Coast
26	Dorsum of head between frontal carinae with 9-12 fine rugae; flattened hairs on gaster long and spatulate; TL 3.1-3.4 mm; reddish brown	.	.
.		Tetramorium somniculosum	Mozambique
Complex-2	Without bizarre pilosity and irregular outline to alitrunk
83 & 104	Dorsum of alitrunk gaster with abundant fine erect pilosity; TL 2.8-3.1 mm; uniform yellow	.	.
.		Tetramorium intonsum	West Africa
-	Dorsum of alitrunk gaster with spaced out relatively elongate and stout erect pilosity
105	Pronotal dorsum regularly longitudinally rugulose; TL 2.4-2.8 mm; uniform yellow to yellowish-brown	Tetramorium shilohense	southern East Africa
106	Pronotal dorsum rugoreticulate or irregularly rugose; sides of head reticulate-rugose; TL 2.2-2.6 mm; yellow tinged with brown	.	.
.		Tetramorium jugatum	West Africa and Angola
106	Pronotal dorsum rugoreticulate or irregularly rugose; sides of head punctulate or granular; head relatively large; TL 2.5-2.8 mm; yellow	Tetramorium termitobium	Congo Basin
Complex-3	Irregular outline to alitrunk but eye reduced to a single facet and frontal carinae very feeble
109	Dorsal alitrunk sculptured; TL 2.4 mm; uniform yellow	Tetramorium dysderke	Nigeria
Complex-4	Reduced sculpturation, eye reduced to 1-5 ommatidia and frontal carinae vestigial
108	Eye with 3-4 ommatidia; TL 2.6-3.1 mm; yellow	.	.
.		Tetramorium amaurum	Zimbabwe
111	Eye of single ommatidium; lateral clypeus strongly raised; TL 2.1-2.3 mm; uniform clear pale yellow	.	.
.		Tetramorium warreni	South Africa
111	Position of eye marked by a small dark patch; lateral clypeus low and not raised; TL 2.0-2.1 mm; uniform clear pale yellow	.	.
.		Tetramorium typhlops	Ivory Coast
112	Eye of a single ommatidium; mandibles feebly sculptured; TL 2.4-3.0 mm; yellow	.	.
.		Tetramorium subcoecum	Southern East Africa
112	Eye of two ommatidia; mandibles strongly striate; TL 2.8-3.0 mm; yellow	.	.
<.		Tetramorium traegaordhi	South Africa & Congo Basin

TD4 Eyes larger > 0.20 X HW, wider than maximum width of scape
QD1 Petiole and sometimes postpetiole squamiform Otherwise quarternary division
squaminode-group	-
Complex-1	Eyes set well back on head
45	Alitrunk dorsum finely and predominantly longitudinally rugose; TL 3.0-3.4 mm; glossy mid-brown, gaster darker	.	.
.		Tetramorium repentinum	Zimbabwe
45	Alitrunk dorsum coarsely rugo-reticulate; TL 3.3-3.6 mm; uniform dark brown	Tetramorium sitefrum	Ghana
Complex-2	Eyes about midlength of head
46	Pronotum and mandibles smooth; no hairs on first gastral tergite; TL 2.5-2.6 mm; uniform brown, appendages lighter	.	.
.		Tetramorium matopoense	Zimbabwe
-	Strongly sculptured, mandibles striated Otherwise
-	Pronotum dorsum sculptured, first gastral tergite with hairs
47	First gastral tergite with conspicuous basal costulae; dorsum of head completely rugo-reticulate; TL 2.8-3.2 mm; yellow, gaster darker	.	.
.		Tetramorium umtaliense	Zimbabwe
-	First gastral tergite without basal costulae; dorsum of head rugulose
49	Petiole with distinct transverse sharp transverse crest; TL 3.3-3.9 mm; brown	.	.
.		Tetramorium squaminode	Tanzania
-	Petiole with rounded apex
52	Postpetiole very broad and with weak sculpturation; TL 3.3 mm; mid-brown, head and gaster darker	.	.
.		Tetramorium platynode	South Africa
53	Postpetiole not so broad and unsculptured; dorsum of head finely reticulate; TL 2.5 mm; yellow brown, appendages and underside of gaster lighter - the Tanzania specimens differ slightly	.	.
.		Tetramorium dogieli	Kenya & Tanzania
53	Postpetiole not so broad and unsculptured; dorsum of head longitudinally rugose; TL 3.2-3.4 mm; dark brown, gaster darker	.
.		Tetramorium nube	South Sudan
-	Less strongly sculptured, mandibles smooth
48	First gastral tergite with dense, long sharp hairs; TL 3.7-4.0 mm; dark brown to blackish		.
.		Tetramorium akermani	southern Africa
-	First gastral tergite with short stout hairs, generally sparse
50	Postpetiole strongly compressed in profile, as squamate as petiole; TL 3.0-3.2 mm; mid-brown, gaster darker	.	.
.		Tetramorium do	Zimbabwe
-	Postpetiole not strongly compressed in profile and differing from petiole
54	Eyes relatively small, < 0.24 X HW; dorsum of head strongly longitudinally rugose; TL 2.7-4.0 mm; uniform light brown	Tetramorium frigidum	South Africa
55	Eyes larger, > 0.26 X HW; dorsum of head weakly sculptured; frontal carinae wide apart, postpetiole node somewhat compressed; TL 2.4-3.2 mm; yellowish-brown, gaster much darker	Tetramorium flaviceps	Zimbabwe
55	Eyes larger, > 0.26 X HW; dorsum of head weakly sculptured; frontal carinae closer together; postpetiole node low and rounded; TL 2.7-3.2 mm; uniform pale yellow	.	.
.		Tetramorium jejunum	Zimbabwe

© 2007, 2008, 2010, 2011, 2013, 2014 - Brian Taylor CBiol FSB FRES 11, Grazingfield, Wilford, Nottingham, NG11 7FN, U.K.

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