The Ants of Africa
Genus Crematogaster - Subgenus Nematocrema
Genus Crematogaster Introduction

Subgenus Nematocrema Santschi (1918d: 182)

Diagnostic Features - Antenna without a distinct club, filiform in female. Palp formula 4:3. Frontal carinae short. Mesonotum without a median carina. Propodeal spines long straight and acute frontal carinae well developed. Petiole with parallel sides, usually straight or scarcely arcuate, rarely broader posteriorly than anteriorly. Postpetiole entire.

Santschi's (1918d) subgenus description is at {original description}.

Bernard (1952) commented on the genus as large species with a very long petiole, particularly western African. Only the three species listed below are listed within the subgenus by Bolton (1995). Delage-Darchen (1972b) made a detailed study of the larvae of what she, advised by Baroni Urbani, took to be varieties of Cr. stadelmanni from Gabon and Ivory Coast.

Note: Blaimer (2012) has Nematocrema as a junior synonym of Oxygyne. From Africa, She listed  C. breviventris, C. donisthorpei, C. magitae, C.margaritae (including subspecies brevarmata, cupida, lujae); C. oscaris; C. santschii (including subspecies clymene re-transferred); C. stadelmanni (including subspecies anguliceps, angustata, dolichocephala, gracilenta, intermedia, ovinodis, schereri, spissata); C. trautweini (re-transferred).

Blaimer, B.B. 2012. Untangling complex morphological variation: taxonomic revision of the subgenus Crematogaster (Oxygyne) in Madagascar, with insight into the evolution and biogeography of this enigmatic ant clade (Hymenoptera: Formicidae). Systematic Entomology, 37: 240-260.

Species known from Africa


Queen only described; TL 7 mm; head more square but scapes short, SI only 105; glabrous and shiny; black, funiculi and tarsi brown, wings more brown - type images on species page
Cameroun & CAR - breviventris

Queen; TL 6.7 mm; black but with extremities dark to reddish-brown - type image shows a wholly red-brown colour, wings yellow-brown; head in full face view a narrow oval; scapes long, SI 133; erect pilosity short and quite sparse; distinct fine striation on head (see worker below, described as gracilenta)
West Africa - magitae

Queen from Mayr description, TL 8.8 mm; workers variable see species page; queens with ovoid heads - anguliceps has abundant short pilosity SI 143
West Africa & Congo Basin -  stadelmanni

WORKERS

1
Crematogaster stadelmanni type workerHead in full face view near square, CI 100, with distinct impression at median ocellus position; scapes shorter SI 88
stadelmanni type
2
Crematogaster gracilentaSmaller TL ca 4.7 mm; quite distinct with narrow ovoid head, CI 92; SI 94; propodeal spines shorter and stouter
gracilenta worker, queen  = magitae
Contents MYRMICINAE Introduction
2007, 2008, 2009, 2012, 2015, 2016, 2018 - Brian Taylor CBiol FRSB FRES
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