The Ants of Africa
Genus Proceratium
Contents - Proceratiinae - PROCERATIINAE Introduction

Genus Proceratium Roger (1863a: 171)


Diagnostic Features - Tergite of second gastral tergite strongly vaulted so that the remaining segments point anteriorly. Alitrunk devoid of sutures. Mandibles with three or more teeth, not overhung by the clypeus. Apical segment of the antenna moderately enlarged but not bulbous. Roger's (1863a) genus definition is at {short description of image}. Proceratium, junior synonym Sysphincta (Brown, in Borgmeier, 1957: 118).

Bolton (1973a) mentions a single, unnamed, West African species, known only from rotten wood in Ghana. Members elsewhere normally prey on the eggs of arthropods (Hölldobler and Wilson (1990, pages 224, 565).

The genus was revised by Baroni Urbane & De Andrade (2003). The parts relevant to species known from sub-Saharan Africa are at, pp 59-62, {short description of image}. and, pp 282-305, {short description of image}. Unfortunately, the illustrations they gave were mostly monochrome SEM images and have not scanned well [Baroni Urbani, C. and M. L. De Andrade. 2003. The ant genus Proceratium in the extant and fossil record (Hymenoptera: Formicidae). Museo Regionale di Scienze Naturali, Monografie, 36, 1-480]

Key to Afrotropical species, developed from Terron (1981) - {short description of image}.

1 {short description of image}Clypeus projecting forwards of the frontal carinae, with the anterior border notched; TL 2.7 mm; overall coarsely and regularly punctate; covered with dense golden pubescence, particularly visible on second gastral segment; black, appendages and clypeus brown .
<. Proceratium boltoni Ghana - boltoni
-- Clypeus in dorsal view not or only slightly projecting forwards of the frontal carinae, border entire 2
2 Eyes well developed with 8 or 25 ommatidia 3
-- Eyes with no more than one ommatidia or absent 4
3 {short description of image}Eyes well developed with about 25 ommatidia, also a well developed median ocellus; TL ca 3 mm; sculpturation of head granulose, similar but finer on the alitrunk and gaster, latter weakly shiny; overall covered with minute whitish pubescence; ferruginous, region of ocelli browner, propodeal margins black; seemingly Baroni Urbani and De Andrade Kenya - toschii
-- Proceratium burundenseEyes with about 8 ommatidia but no obvious ocelli; integumental foveae small, gaster with superficial sculpture Burundi - burundense
4 {short description of image}Eyes absent; second segment of gaster shorter than the first; TL 2.3 mm; overall sculpturation dense fine puncturation; pubescence reduced and whitish; yellow red .
. Proceratium terroni as coecum in Terron key - Cameroun - terroni
-- Eyes reduced but visible 5
5 Proceratium arnoldiWith no more than superficial foveae; apex of frontal carinae rounded; second segment of gaster about 1.2 X longer than first; TL 3 mm; reddish-yellow, margins of frontal carinae and propodeal teeth piceous; covered all over with dense yellowish-white pubescence, longest on the gaster Zimbabwe - arnoldi
-- {short description of image}Foveae all deep; second segment of gaster about the same length as the first; apex of frontal carinae angular; dark yellow-brown, appendages and apex of gaster yellower; integumental foveae large & deep, gaster with deep sculpture .
. Proceratium lunatum Cameroun - lunatum
Contents PONERINAE Introduction
© 2007, 2008, 2009, 2012, 2014 - Brian Taylor CBiol FSB FRES
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