The Ants of Africa Genus Tetramorium species-groups - Part 3
Tetramorium Introduction

DIV3
Species groups
Part 3 - former Tetramorium (species with long antennal scapes)

DIV3 12-segmented antennae (Tetramorium)
SD1 Scape index 100 or more (scape longer than head width; usually surpasses occiput) Otherwise next secondary division
Frontal carinae extended back beyond posterior of eyes Otherwise next tertiary division
setigerum-group - complex-A	Diameter of eye usually > 0.25 X HW; petiole node high and narrow in dorsal view Otherwise next species group
.	With variable clavate hairs	Tetramorium parasiticum	queen only - South Africa
-	With exceptionally long appendages; SI > 150
114	Dorsum of head and alitrunk rugulose with dense inter-rugal sculpture; TL 4.3-4.7 mm; uniform dark brown	Tetramorium dolichosum	Zaïre
114	Dorsum of head and alitrunk weakly rugulose with little inter-rugal sculpture; TL 4.8-5.4 mm; dark brown	.	.
.		Tetramorium perlongum	Angola
-	With relatively short appendages
-	Propodeum with short spines
155	Sides of head behind eyes without projecting hairs; TL 3.0-3.3 mm; mid-brown	.	.
.		Tetramorium praetextum	Namibia
-	Propodeum with long spines and strongly developed frontal carinae
138	Smooth mandibles; TL 4.0-4.1 mm; medium to dark brown, gaster darker	Tetramorium agile	Zimbabwe
144	Promesonotal dorsum smooth & shining; mandibles striated; TL 3.0-3.5 mm; mid- to dark brown	.	.
.		Tetramorium laevithorax	East & South Africa
-	Promesonotal dorsum distinctly rugulo-punctate; mandibles striated
145	Eye diameter 0.28-0.31 X HW; smaller specimens HW at least 0.68; with numerous strong standing hairs on dorsum; TL 3.4-4.0 mm; mid- to dark brown, gaster darker	.	.
.		Tetramorium setigerum	East & South Africa
-	Eye diameter 0.25-0.28 X HW; HW 0.58-0.67
146 & 156	Petiole node rounded as shown; striated mandibles; 3.1-3.7 mm; mid-brown or darker	.	.
.		Tetramorium avium	South Africa
146	Petiole node angular as shown; TL 2.9-3.4 mm; uniform dark brown	.	.
.		Tetramorium frenchi	South Africa & Zimbabwe
flabellum-group (part)	Diameter of eye no more than 0.24 X HW; petiole node long and low in profile
flabellum-complex	With long scapes (SI 90-100+) and strongly developed frontal carinae; clypeus with strong median carina and diagonal lateral carinae
149	Dorsal surfaces with bizarre fan-shaped hairs; TL 2.9-3.2 mm; dark brown	Tetramorium flabellum	Ivory Coast & Ghana
-	Dorsal surfaces with simple, usually stout and blunt, erect hairs
150	Postpetiole dorsum less strongly sculptured than sides or petiole, with a median smooth strip; TL 2.8-3.0 mm; dark brown, gaster lighter	.	.
.		Tetramorium sigillum	Ivory Coast
-	Postpetiole dorsum sculptured as sides and petiole dorsum
152	Light coloured, yellowish-brown; TL 3.0-3.1 mm	Tetramorium kestrum	Eastern & southern Africa
153	Dorsum of head with erect hairs no longer than diameter of eye; TL 3.0-3.5 mm; dark brown	.	.
.		Tetramorium ataxium	West Africa & Congo Basin
153	Dorsum of head with erect hairs markedly longer than diameter of eye; TL 3.4 mm; reddish-brown dark and glossy	Tetramorium geminatum	Cameroun & Gabon
Frontal carinae end at or forward of posterior of eyes
aculeatum-group former Macromischoides	Petiole node high and narrow in profile, in dorsal view broader than long Otherwise next species group
99	Metapleural lobes elongate triangular; petiole with low node; TL 4.8 mm; dark brown	.	.
		Tetramorium rimytyum	Ghana
-	Metapleural lobes much reduced or absent; petiole node high and narrow in profile
.	Petiole with long peduncle; erect pilosity long	.	.
60 & 100	Petiole with long peduncle; TL 3.2-5.4 mm +; variable forms light brown to near black (propodeal spines may be much reduced)	.	.
.		Tetramorium aculeatum	pan-African forests
.		Tetramorium aculeatum queen	.
new species	Overall size smaller, wing smaller; CuA cell proportionally smaller; mandibles completely smooth; head frontal area with little sculpturation; eye longer than wide (circular in aculeatum); head in profile with occiput shallowly but distinctly convex (near flat in aculeatum); distance between dorsal ocelli = 2.11 X length of ocelli (in aculeatum = 2.84); HW/width across eyes/HW = 123 (aculeatum = 118); CI = 84 (aculeatum CI = 90); funiculus segment 3-4 together shorter than segment 1 (in aculeatum 3+4 = 1); scape proportionally longer and SL greater, SI 131 (aculeatum SI = 110); pronotum dorsum with 9-10 strong parallel rugae; postpetiole in profile relatively narrow; longer erect hairs on hind legs and scapes; overall much paler orange-brown (aculeatum ranging from near black to brown	Tetramorium robini	Central African Republic - new species
.	Petiole with short peduncle; erect pilosity short	.	.
60 &100	TL 3.7-4.7 mm; uniform light to medium brown; gaster with dense short pilosity	.	.
Queen		Tetramorium africanum	West Africa & Congo Basin
Queen only	With erect hairs on gaster absent or restricted to posterior border of segments	Tetramorium rotundatum	Congo Basin
sericeiventre-group	Petiole node long and low in profile, in dorsal view usually longer than broad; clypeus laterally with a prominent tooth or crest Otherwise next species group
longicorne-complex	Mandibles unsculptured; no pilosity; large eyes
41	TL 4.4-5.1 mm; dull red, gaster darker	.	.
.		Tetramorium longicorne	East Africa
bequaerti-complex	Striated mandibles; numerous short erect hairs on scapes and tibiae of middle and hind legs
96	All over with very dense pile of short soft hairs; TL 3.3 mm; uniform dark brown	Tetramorium xuthum	Ghana
-	Numerous short erect hairs all stout and scattered
97	Head with distinctive lug on posterior ventral corner; TL 4.3-4.6 mm; dull red	.	.
.		Tetramorium bequaerti	eastern Zaïre & Tanzania
-	Head with rounded posterior ventral corner
98	Dorsum of head behind eyes feebly sculptured to smooth; TL 3.0-3.4 mm; reddish yellow to dull red	.	,
.		Tetramorium bulawayense	Zimbabwe
98	Dorsum of head behind eyes strongly rugulose; TL 3.0-3.2 mm; reddish yellow to dull red	.	.
.8		Tetramorium hortorum	Zimbabwe
sericeiventre-complex	Striated mandibles; no erect hairs on scapes and tibiae of middle and hind legs
-	Propodeal dorsum with one or more pairs of erect hairs Otherwise
-	Short, stout, erect hairs projecting on sides of head behind the eyes
121	Densely hairy; promesonotum dorsum coarsely longitudinally rugose; TL 4.1 mm; uniform dark brown, with reddish tint	.	.
.		Tetramorium asetyum	Nigeria
121	Densely hairy; promesonotum dorsum smooth or nearly so: TL 3.6-3.7 mm; light brown, with reddish tint, gaster darker	Tetramorium petersi	Namibia
-	Without erect hairs projecting behind the eyes
122	Propodeal dorsum with only a single pair of hairs; first gastral tergite with blunt hairs; TL 4.0-4.3 mm; dull red, gaster blackish-brown	Tetramorium khyarum	Nigeria round western savannah to Botswana
122	Propodeal dorsum with several pairs of erect hairs; first gastral tergite with slender acute hairs TL 3.8-4.4 mm; dull red or reddish-brown, gaster darker	.	.
.		Tetramorium sepositum	Zimbabwe & South Africa
-	Without erect hairs on propodeum
123	Dorsal alitrunk very coarsely rugose, spaces shining; TL 3.8-4.5 mm; dark red, gaster blackish, glossy	Tetramorium gladstonei	Zimbabwe
124	Dorsal alitrunk and head with fine rugulae and dense reticulate puncturation; base of gaster usually completely finely sculptured, matt and dull; TL 3.3-4.4 mm; colour dull red variable from yellowish through to dark, gaster usually darker	.	.
.		Tetramorium sericeiventre	Pan-african
124	Dorsal alitrunk and head feebly sculptured at most; base of gaster smooth and shiny; TL 3.6-4.0 mm; colour dull red variable from yellowish through to dark, near black	.	.
.		Tetramorium quadrispinosum	southern Africa & Madagascar
Queen only	inquiline found in nests of sepositum and sericeiventre	Tetramorium microgyna	Southern Africa
setigerum-group - complex-B	Petiole node high and narrow in profile, in dorsal view usually longer than broad; clypeus laterally not strongly modified
-	Propodeum with no more than denticles; weak frontal carinae
118 & 157	Sides of head behind eyes with projecting hairs; pronotal dorsum sculptured: TL 3.2-3.8 mm; yellowish-brown to mid-brown	Tetramorium doriae	Ethiopia also Arabian Peninsula
118 & 157	Sides of head behind eyes with projecting hairs; pronotal dorsum mostly unsculptured; TL 3.4 mm; uniform mid-brown	.
.		Tetramorium gracile	Ethiopia
-	Propodeum with long spines but weak frontal carinae
141	Longitudinal rugulae on head without cross-meshes, almost smooth between rugae; TL 3.6-4.1 mm; dark brown, appendages yellow	.	.
.		Tetramorium metatactum	Kenya
141	Longitudinal rugulae on head with cross-meshes, distinct ground-sculpture between rugae; TL 3.4 mm; glossy blackish-brown, appendages pale yellow	Tetramorium youngi	Angola

© 2007, 2008, 2010, 2011, 2013, 2014, 2016 - Brian Taylor CBiol FRSB FRES 11, Grazingfield, Wilford, Nottingham, NG11 7FN, U.K.

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