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The Ants of
Africa Genus Crematogaster - Subgenus Orthocrema |
Genus Crematogaster Introduction |
Diagnostic Features - Antennal club 2-jointed. 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 . Described by Bernard (1952) as primarily
oriental, small ants, often soil-inhabiting, considered as the most
primitive of the genus by virtue of the petiole structure.
Key to workers
1 | Overall with numerous fine erect hairs; head more circular than square; promesonotum marginate and wider in front than long; in dorsal view petiole quadrate and straight-sided; erect hairs quite abundant and slender | 2 |
-- | With few or no erect hairs |
3 |
- | Numerous fine erect hairs |
-- |
2 | ![]() |
Ivory Coast - n. sp. Dupont |
-- | ![]() Cr. sordidula marocana type TL ca. 2.8 mm, HL 0.60, HW 0.54, SL 0.47, PW 0.35; CI 92, SI 89. |
Circum-mediterranean - sordidula |
-- | ![]() |
Tanzania - dolens |
-- | Few erect hairs |
-- |
3 | ![]() |
Zaïre & Gabon - gratiosa |
-- | Scape not or only just surpassing the occiput, eyes convex or flat | 4 |
4 |
Alitrunk flat to slightly concave; few erect hairs in pairs on alitrunk and pedicel; relatively long propodeal spines | 5 |
-- | Alitrunk convex; no or only short propodeal teeth | 7 |
-- | Alitrunk flat to slightly concave; few erect hairs in pairs on alitrunk and pedicel; long propodeal spines | -- |
5 | ![]() |
Kenya - jeanneli |
-- | Other than unicolourous black | 6 |
6 | ![]() |
Congo & South Sudan - molongori |
-- | ![]() TL 2.0-2.6 mm; head wider than long, angles rounded; eyes placed well back; scape robust and surpassing occiput; club two-segmented; alitrunk distinctly bordered; propodeum with a small circular spiracle, the spines long and straight angled upward posteriorly; pubescence fine and sparse, erect hairs slender and obtuse; few and short on anterior of head, on alitrunk three pairs of large long hairs placed on lateral border placed as shown; petiole and postpetiole each with one pair; gaster with only narrower hairs; smooth and shiny, sides of alitrunk reticulate, pedicel and gaster finely punctate; colour testaceous yellow, gaster more brown-red; |
West Africa & Congo Basin - pauciseta |
-- | Alitrunk convex; no or only short propodeal teeth | -- |
7 |
Head more circular than square; promesonotum marginate and wider in front than long; in dorsal view petiole quadrate and straight-sided; erect hairs quite abundant and slender | 8 |
-- | Head rectangular; petiole not quadrate in dorsal view | 10 |
8 | ![]() |
Comoro Is - voeltzkowi |
-- | With short, sharp propodeal spines | 9 |
9 | ![]() |
Zimbabwe - rectinota |
-- | ![]() |
Kenya - litoralis |
-- | Head rectangular; petiole not quadrate in dorsal view | -- |
10 | ![]() |
South Africa - transvaalensis |
-- | Head square not longer than wide | 11 |
11 | ![]() |
Zimbabwe - boera |
-- | TL no more than 2.5 mm | 12 |
12 | ![]() |
South Africa - natalensis |
Promesonotum wider in front than long | 13 | |
13 | ![]() |
West Africa & Central African Republic - muralti |
-- | ![]() |
Uganda - ugandensis |
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MYRMICINAE Introduction |
© 2007, 2008, 2009, 2010, 2013, 2015, 2016, 2018 - Brian
Taylor
CBiol
FRSB FRES 11, Grazingfield, Wilford, Nottingham, NG11 7FN, U.K. |
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