The Ants of Africa
SUBFAMILY DOLICHODERINAE

Genus Axinidris Weber
Dolichoderinae Introduction

Genus Axinidris Weber (1941a: 192)

Diagnostic Features - The propodeum is armed with a pair of teeth, tubercles or acute angles posterolaterally, sometimes these are linked by a narrow carina; propodeal spiracle located near the dorsal surface of the propodeum, at least anterior border raised on a slight projection, directing opening rearwards. Between the armament, or somewhat more dorsally, is a prominent tubercle, projecting plate, longitudinal ridge or tooth. Petiolar node broadly rounded dorsally and strongly inclined anteriorly.

Weber's (1941a) genus description is at {original description}. Shattuck's (1991) genus revision is at {original description} - pdf not available on HNS.

The revision by Shattuck (1991) enlarged Axinidris, hitherto containing only one species from East Africa, into a multi-species genus, with the nine West African species, a Central African species (denticulatum, which might well be found in West Africa); and three East African species. Surprisingly, Shattuck did not give measurements of Total Length, although he cites genus members as being between 2.9 and 4.5 mm in overall body length.


Key to all species known from Africa (developed from Shattuck, 1991; and the extended key of Snelling, 2007).

1 Propodeal ridge cariniform or absent; pronotum with evenly rounded sides 2
-- {short description of image}Propodeal ridge compressed and strongly elevated; pronotum dorsum with weakly margined sides; fresh specimens with an abundance of long, slender whitish hairs ,
. {short description of image} South Sudan & Kenya - acholli
2 Pronotum and scape without raised hairs; gaster tergites usually without erect hairs 3
-- Pronotum with at least 2 erect hairs; scape and gaster tergites with or without erect hairs 10
3 Propodeum with dorsal median carina at least on the posterior half; propodeum with variable spines 4
-- {Axinidris bidens}Propodeal dorsum without a median carina; spines triangular in profile with surface between them straight;
Head, alitrunk and gaster reddish-brown; lateral areas of head finely imbricate and with widely spaced punctures
West Africa - bidens [part?]
4 Pronotum dorsum with imbricate sculpturation and only slightly shiny; rest of alitrunk duller with fine contiguous puncturation; dorsal surfaces with abundant appressed pubescence; distance between outer margins of propodeal spines subequal to width of propodeum at the spiracles 5
-- Pronotum and mesepisternum smooth and shiny; contrasting with with finely and contiguously puncturate propodeum; pronotum with sparse appressed pubescence; distance between outer margins of propodeal spines much less than width of propodeum at the spiracles 7
5 Vertex of head and gastral tergites without erect hairs 6
-- {short description of image}Vertex of head with one pair of erect hairs below the dorsal margin; gastral tergites 3 & 4 each with several erect hairs;
?? yellowish-red, tarsi light yellow
Liberia - occidentalis
6 HL > HW; HW < 0.70 mm; head and body dark brown, lower half of clypeus, mandibles and most of scape yellowish-red; meso- and metatarsi whitish Kenya - icipe
-- {short description of image}HL < HW; HW 0.97 mm; head and body black; hypostomal area, ventral head, mandibles and legs reddish-black; tarsi dark yellowish-red .
. Axinidris kakamegensis Kenya - kakamagensis
7 Propodeum with the carina low and right-angle to obtuse in profile 8
-- {short description of image} Propodeum with the carina elevated and acute in profile
raised dorsally into a tooth
.
. {short description of image} Malawi, South Africa - tridens
8 At least fourth gastral tergite with 2 or more erect hairs; head and body light brown 9
-- {short description of image}Third & fourth gastral tergites without erect hairs; head and pro-mesonotum light reddish; petiole and base of gaster yellowish Central African Republic - mlalu
9 Axinidris okekaiHypostomal area without erect or suberect hairs; longest hair on fourth gastral tergite about 0.1 mm long and erect hair on vertex of head about 0.66 of that on the frontal lobe Kenya - okekai
-- Hypostomal area with several erect or suberect hairs; longest hair on fourth gastral tergite about 0.06 mm long and longest erect hair on vertex of head about 0.60 of that on the frontal lobe Namibia - namib
. Pronotum with at least 2 erect hairs; scape and gaster tergites with or without erect hairs .
10 Propodeum lacking a median carina and lateral spines much reduced in dorsal view; pronotum with one pair of long erect hairs and propodeal spines each with a similar hair; clypeal notch broad and shallow 11
-- Propodeum with distinct median carina; pilosity not as foregoing; clypeal notch relatively narrow 12
11 {Axinidris bidens} Medium to dark brown; gena distinctly finely imbricate; HW > 0.5 mm West Africa & [?] Kenya - bidens [part?]
-- {short description of image}Head and body light reddish-yellow, gaster sometimes darker; genae smooth and shiny, sometimes weakly imbricate; HW usually < 0.50 mm (may be up to 0.52 mm)
Antennal scapes attaining but not surpassing the occiput?; dark yellow brown; finely shagreened, most densely on head and propodeum; pair of long hairs on clypeus, pronotum, propodeum and gaster; pubescence sparse; head near rectangular, eyes large (ca quarter of head), set around the midpoint; pro-mesonotum convex, propodeum with dorsum about four times as long as the declivity, with a distinct transverse ridge and declivity concave (former parvus is a junior synonym)
Liberia, (Gabon) Zare & Kenya - hypoclinoides
12 In dorsal view, distance between outer margins of propodeal spines equal to or greater than width of propodeum at spiracles; pronotum dull due to coarse imbrication or puncturation, and closely pubescent 13
-- In dorsal view, distance between outer margins of propodeal spines distinctly less than width of propodeum at spiracles and/or pronotum shiny and sparsely pubescent 14
13 Axinidris nirgripesErect hairs on head and alitrunk brown, coarse and seta-like; propodeal spines short, no longer than thick in profile Ghana - nigripes
-- {short description of image}Erect hairs on head and alitrunk fine and yellowish; propodeal spines distinctly longer than thick in profile Kenya - luhya
14 Mesonotum either smooth and shiny between short longitudinal rugae or slightly shiny and coarsely rugulose 15
-- Mesonotum moderately shiny, anteriorly finely imbricate, posteriorly duller and densely puncturate 16
15 Mesonotum smooth and shiny between short longitudinal rugae; head and body light reddish brown Tanzania - stageri
-- {short description of image}Mesonotum slightly shiny and coarsely rugulose; head and body dark brown South Africa - lignicola
16 Scape with fine prostrate pubescence but no erect or suberect hairs; front of head with six erect hairs (two along each frontal carina and two posteriorly) 17
-- Scape with at least one or two erect hairs in addition to prostrate pubescence; front of head with two erect hairs along each frontal carina and four or more posteriorly 19
17 In dorsal view, distance between outer margins of propodeal spines distinctly less than width of propodeum at spiracles; frons and vertex moderately shiny, weakly imbricate and with scattered weak punctures; gaster concolorous with alitrunk 18
-- {short description of image} In dorsal view, distance between outer margins of propodeal spines at least equal to width of propodeum at spiracles; frons and vertex weakly shiny, contiguously finely puncturate and strigulate; alitrunk brown, gaster yellowish red .
. Axinidris palligastrion Ghana - palligastrion
18 {short description of image} Median carina of propodeum broadly rounded in profile; second tergite of gaster moderately shiny and densely punctate; body colour reddish-brown; proximal region of tarsi similar in colour to distal tibia Congo Basin - denticulatum
-- Axinidris ghanensisMedian carina of propodeum subacute in profile; second tergite of gaster shiny between sparse punctures
tarsi light yellow
Ghana - ghanensis
19 Pronotum with at least two fully erect hairs in addition to humeral pair; frons slightly shiny to shiny; with weak sculpturation 20
--
{short description of image}Pronotum with only two fully erect hairs, one at each humerus; frons shiny, with variable sculpturation; head blackish, distal mandible yellowish, with reddish-yellow teeth, body dark brown, petiole mostly whitish, legs brown with paler tarsi Gabon - gabonica
20 Scape with six or more short erect hairs; frons slightly shiny; finely colliculate to imbricate 21
-- {short description of image} Scape with one or two short erect hairs; frons shiny, weakly coriaceous
Body colour dark reddish brown to black; proximal region of tarsi much lighter than the distal tibia
.
. Axinidris kinoin Nigeria - kinoin
21 {short description of image}Body colour reddish-yellow; gaster yellow and similarly coloured to posterior of petiole .
. {Axindris hylekoites} Ghana - hylekoites
-- {short description of image}Body and gaster colour reddish-brown; gaster darker than posterior of petiole West Africa & Gabon - murielae
Contents
2007, 2009, 2010, 2013, 2015 - Brian Taylor CBiol FSB FRES
11, Grazingfield, Wilford, Nottingham, NG11 7FN, U.K.

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