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

Subgenus Sphaerocrema Santschi (1918d: 182)

Diagnostic Features - Antennae 11-jointed. Frontal carinae well developed. Petiole broadened in front, trapezoidal, sometimes truncated or rounded at the anterior angles. Postpetiole entire and without a median furrow.

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

Key to Workers

Crematoagster lamotteiWorkers poorly defined and apparently consisting of a mixture of species - type similar to kneri but varieties in striatula group (see 10 striatula)
Guinea - lamottei
. Long headed queens (cf Cr. wellmani) -
queen only Mali - longiceps
{Crematogaster angusticeps}queen only; TL 7.5 mm, with elongated rectangular head; propodeum unarmed; testaceous red with the legs lighter and the gaster blackish brown (perhaps the female of wellmani); photographs on species page
Mali - angusticeps
{Crematogaster stenocephala}Queen only; head narrower than angusticeps; other characters similar - no photographs available
Senegal - stenocephala
. -
1 Propodeum with spines absent or reduced to tubercles; 2
-- Propodeum with distinct spines 4
2 TL 3.8-4.0 mm; propodeum with denticles; colour generally black, appendages red-brown; head wider than long Equatorial Guinea - microspina
-- Colour orange-brown darkening posteriorly but not black; head longer than wide 3
3 {short description of image}TL 3.0-5.0 mm; propodeum with rounded tubercles; colour darkening posteriorly from orange-red head to brown gaster; .
. {Crematogaster wellmani} Pan-African - wellmani
-- {short description of image}TL 2.5-3.75 mm; propodeum with tubercles sharper and a distinctive large bordered spiracle; colour brownish-yellow, gaster darker .
. {Crematogaster pseudinermis} North-east Africa - pseudinermis
return to list Propodeum with distinct spines -
4 {short description of image}Propodeal spines stout and fairly blunt: TL 2.8-4.5 mm; essentially shiny with clypeus smooth and with an arcuate anterior margin; colour reddish-brown, gaster darker .
. {Crematogaster gambiensis} Pan-African - gambiensis
-- Propodeal spines sharp 5
5 Promesonotum concave 6
-- Promesonotum flat or convex 7
6 {Crematogaster concava}TL 3.0-3.75 mm; head near square in full face view; scape surpassing the occiput; pronotal dorsum distinctly concave; metanotal groove deep; propodeal spines long, sharp and distinctly divergent; colour chestnut brown, head and gaster very dark West Africa & Congo Basin - concava
. {Crematogaster lotti} (also, possible junior synonym lotti from Sudan)
-- Crematogaster juventaTL 2.7-3.0 mm; head square, very slightly longer than wide; scape reaching occiput; eyes slightly convex, about one-fifth of head and placed behind the mid-line; pronotum slightly concave (less than concava); head shiny very finely striate on gena; rest of body mostly smooth; few erect hairs but decumbent pubescence quite abundant, dense and erect on antennae; colour yellow brown, occiput darker, gaster blackish in posterior half Zare - juventa
-- {short description of image}TL 4 mm; not obviously differing from above two other than somewhat larger and darker brown .
. {Crematogaster similis} CAR & Eastern Zare - similis
Promesonotum flat or convex -
7 Promesonotum distinctly convex striatula-group - 8
-- Promesonotum flat kneri-group - 13
8 Base colour brown or darker 9
-- Base colour reddish 11
9
Base colour brown or darker 10
-- Base colour yellow brown head and alitrunk, gaster darker 10a
10 {Crematogaster gabonensis}TL 4.5 (holotype); head large, sides arcuate; promesonotum forming a single dome; promesonotal suture distinct; metanotal groove wide and deep; propodeal spines flat and sharp as long as propodeum dorsum; colour dark rust-red, gaster pitch brown West Africa & Congo Basin - gabonensis
-- {short description of image}TL 4.5 mm; not very obviously different to gabonensis, but head seemingly rather narrower; type with a dark brown head .
. {Crematogaster libengensis} Congo Basin (& West Africa?) - libengensis
-- {Crematogaster zonacaciae}TL 4.0-4.2 mm; eyes set behind mid-point of head, frontal carinae reaching level of eyes; head with distinct median furrow; propodeal spines narrow & acute but seemingly shorter; petiole from above with convex lobate sides, 1.5 x wider than long; sub-lucid, anterior of head shiny, rest striato-punctate; castaneous, appendages brown (the MCZ cotype has yellow funiculi) - may be a junior synonym of striatula .
. {Crematogaster zonacaciae} Southern Sudan - zonacaciae
-- {short description of image}TL 3.0-3.5 mm; head and lateral alitrunk finely but densely striate; appendages distinctively paler yellowish; propodeal spines moderately long and sharp, with a distinct downturn; Congo specimens darker and somewhat larger; usually with distinctive, contrasting, yellow apex to funiculus
.
. {Crematogaster striatula} Pan-African - striatula
-- {Crematogaster horatii}TL ca. 4.0; head large, sides arcuate, in profile anterior strongly domed; scapes relatively thick; promesonotum forming a single dome; promesonotal suture distinct; metanotal groove wide and deep; propodeal spines slightly downcurved; distinct spiculation on lateral mesonotum; colour very dark red-brown, dark rust-red Kenya & CAR - horatii
return to list Base colour yellow brown head and alitrunk, gaster darker
10a {Crematogaster bequaerti Nigeria}TL 3.0 mm; pronotum flat to slightly convex; metanotal groove not impressed; petiole spines straight, moderately long and flat; subpetiolar spine short and blunt; head very finely longitudinally striate; colour brown, shiny; gaster with semi-decumbent hairs on first tergite
.
. {Crematogaster bequaerti Nigeria form} Pan-African - bequaerti Nigeria form
-- {short description of image}TL 4-6.3 mm; HW > HL; propodeal spines very long, about 1.5 X length of propodeum dorsum; head, alitrink and pedicel mat, densely reticulate-punctate; slightly brownish-red, gaster blackish
.
. {Crematogaster bequaerti} Pan-African - bequaerti type form
return to list Base colour reddish -
11 {short description of image}TL 4.5-5.3 mm; scape surpassing occiput by about its maximum width; dorsum of alitrunk with strong longitudinal rugae, running right back to rear of propodeum; colour testaceous red, gaster slightly darker; .
. {Crematogaster paolii} Somalia - paolii
-- Colour red-brown 12
12 {short description of image}TL 2.3-4.5 mm; head as long as wide, sides moderately arcuate; eyes fairly convex, occupying the third quarter of the head but relatively small; scape slightly surpassing the occiput; metanotal declivity steep but metanotal groove shallow; propodeal spines about as long as one-third the spaces between the bases, horizontal with a large basal spiracle; a pair of erect hairs on each node of the pedicel; pubescence sparse short slightly raised on the thorax; smooth and shiny; colour red-brown with head and postpetiole darker, gaster brown-black with base more or less yellow-brown .
. {Crematogaster nigeriensis} West Africa - nigeriensis
-- {short description of image}TL 3.7 mm; eyes occupy about the third quarter of the head; promesonotal suture very deep, pronotum convex but mesonotum flat; propodeal spines about as long as the propodeum dorsum slightly raised and divergent; head finely and densely striate longitudinally; thorax with short longitudinal rugae with interspaced rugo-reticulation; lateral alitrunk densely striate; colour reddish-brown; mandibles, funiculus and articulations of scape and tarsi clear rust, rest of scape tarsi and petiole more brown Uganda - rustica
-- Crematogaster wilnigerTL 2.0-2.1 mm; head as long as wide, sides moderately arcuate; eyes fairly convex, occupying the third quarter of the head but relatively small; scape slightly surpassing the occiput; metanotal declivity steep but metanotal groove shallow; weakly sculptured and slightly dull; colour uniform red-brown; separable from Crematogaster nigeriensis by the large subpetiolar spine, erect hairs on the pronotum and longitudinal striation on the dorsum and sides of the propodeum Congo Basin - wilniger
return to list Promesonotum flat - kneri group -
13 {short description of image}Petiole of distinct narrow shape; TL 3.5 mm; with strong rugose sculpturation on dorsal alitrunk; colour brown-black, base of gaster lighter .
. {Crematogaster rugosa} West Africa & Congo Basin - rugosa
-- Petiole essentially triangular 14
14 Base colour black or blackish 15
-- Base colour brown, a shade of red-orange or lighter 17
15 {Crematogaster zavattarii}TL 3.0-3.8 mm; unusually convex eyes; scape quite thick and distinctly wider apically; propodeal spines long, acute and divergent but near horizontal in profile; colour piceous, darker than striatula, funiculus and tarsi rust; pubescence pallid .
. {Crematogaster zavattarii} West Africa & Congo Basin - zavattarii
-- {short description of image}TL 2.7 mm; pronotum with fine but distinct median longitudinal carina; propodeal spines long but quite thick with distinct down curve; petiole quite short, as hemiceros; very dark northern Congo Basin - fauconneti
-- Propodeal spines short 16
16 {Crematogaster hemiceros}TL 3.7-4.0 mm; head rectangular; eyes only about one-fifth of head length and set behind the mid-point; scape surpasses occiput by about twice its own width; propodeal spines slender and short, only about a third or quarter the interval between their bases; lateral mesonotum densely reticulo-punctate; anterior of pronotum dorsum with coarse irregular striations, finer more posteriorly, rest of insect smooth; gaster with quite long moderately abundant pubescence; colour black or blackish-brown, appendages lighter Zimbabwe - hemiceros
-- Crematogaster phoenixTL 3.5-3.8 mm; eyes occupy more than the third quarter of the head; propodeal spines slender throughout, slightly upcurved; in dorsal view postpetiole almost square; head matt, densely and finely striate except on the occiput; colour black; ends of tarsi and antennae rust-brown Tanzania - phoenix
Base colour brown or lighter -
17 Base colour brown 18
-- Base colour lighter 19
18 {short description of image}TL 3.5-4.3 mm; promesonotal suture distinct (deeper than in kneri); mesonotum with distinct median carina; colour dark-brown, base of gaster paler; appendages paler to reddish-brown; Tanzania & Zimbabwe - amita
-- {Crematogaster rugosior}TL 3.4-3.8 mm; close to luctans; head wider than long; scape slightly surpassing the occiput; propodeal spines more slender and closer together; shiny but sculpturation of most of body more strongly striated; colour brown more or less with reddish tinge; posterior border of gaster segments yellowish Congo Basin - rugosior
19 Crematogaster luctansTL 2.5-3.3 mm; kneri group but pronotum shorter and wider; scapes shorter; anterior margin of clypeus weakly impressed; occipital margin weakly impressed; dorsum of propodeum short, spines more robust; pronotal dorsum weakly but distinctly sculptured; colour ferruginous-red or yellower, basal segment of gaster clear brown, rest darker but segments with narrow yellowish borders West Africa, Congo Basin, Kenya - luctans
-- Base colour yellowish 20
20 Head and alitrunk essentially smooth and shiny 21
-- Head and alitrunk distinctly sculptured 22
21 {short description of image}TL 3.0-3.5 mm; close to kneri but head and pronotum mostly smooth and shiny; colour testaceous yellow with apex of abdomen blackish West Africa & Congo Basin - chlorotica
-- {short description of image}TL 3.0-3.9 mm; propodeal spines horizontal and short; head smooth and shining with only fine striation on anterior; head and thorax variably dull yellow, gaster dark brown; cf kneri .
. Crematogaster hottentota South Africa - hottentota
22 {short description of image}{short description of image}TL 4.0 mm; head rounded slightly wider than long; pro- and mesonotum marginate laterally; sculpturation of fine reticulation with overlying rugulation on anterior head and alitrunk; propodeal spines long and acute; colour yellowish, gaster darker .
. {Crematogaster kneri} Pan-African - kneri
-- {short description of image}TL 2.8 mm plus; head very finely and densely striate, with distinct but small hair pits, as is thorax; propodeal spines quite robust longer than the propodeal dorsum, divergent and a little recurved; petiole with small anterior ventral tooth; colour varying from brownish-yellow to darker yellow-brown; posterior border of gaster segments with a blackish border .
. {Crematogaster wilverthi} Congo Basin - wilwerthi.

Crematogaster (Sphaerocrema) near kneri

Eight workers were found by Majer (1976b) in a pkd sample at Kade in Ghana.


Crematogaster (Sphaerocrema) near striatula

This was listed from Ghana by Bigger (1993b), who recorded it as a sub-dominant on his study Block of Amazon cocoa at CRIG, in 1969-76. He noted that it was not as aggressive as Crematogaster striatula. It seems likely to be the same as Crematogaster species F 361, which was described by Strickland (1951a) as probably a variety of Crematogaster striatula, less common at CRIG but almost identical in habit.


Crematogaster (Sphaerocrema) undet. Bernard list

From Guinea, Mt. Nimba, Station T 44, Nion, several workers (Lamotte), plus others from leaf litter in the north-east forest (Villiers), defined by Bernard (1952) as soft and immature, therefore not certainly identifiable, although of the nigrans-lamottei group.

Contents MYRMICINAE Introduction
2007, 2008, 2009, 2010, 2011, 2013, 2015 - Brian Taylor CBiol FSB FRES
11, Grazingfield, Wilford, Nottingham, NG11 7FN, U.K.

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