|The Ants of
SUBFAMILY MYRMICINAE - Genus Decamorium
|Contents - Myrmicinae - MYRMICINAE Introduction|
In Tribe TETRAMORIINI.
Diagnostic Features - The key feature is the 10-segmented antenna, with a 3-segmented club.
Bolton (1976, 1995) listed only two species.
Note: Hita Garcia & Fisher (2014) (see http://zookeys.pensoft.net/articles.php?id=3817) opine that Decamorium should be subsumed under Tetramorium, with Decamorium being a "species-group"
|Key following Hita Garcia
& Fisher (2014)
||Dorsum of promesonotum with
conspicuous longitudinally rugose/rugulose sculpture
||Dorsum of promesonotum
unsculptured, smooth, and usually very shiny
||Slightly smaller species, TL ca 3.2 mm, (WL 0.88–0.93); HL 0.64-0.68, HW 0.53-0.56; propodeum armed
with shorter, triangular, and acute teeth (PSLI 10–11); dorsum of
promesonotum longitudinally rugulose with very little ground sculpture,
lateral pronotum mostly unsculptured and shiny, only dorsally
longitudinally rugulose; generally of uniform dark brown colour;
Nigeria - raptor
larger species (WL 0.98–1.06); HL 0.67-0.72, HW 0.54-0.59; propodeum
with longer, triangular to elongate-triangular, and acute teeth (PSLI
16–18); dorsum of promesonotum and lateral pronotum strongly
longitudinally rugose with
distinct punctate ground sculpture; strongly bicoloured species with
dark brown or black gaster contrasting with light brown to reddish
remainderof body; savannah species
Africa & Congo Basin - uelense
||Generally larger species (WL 1.02–1.16); HL 0.71-0.74, HW 0.59-0.62; propodeal teeth
relatively longer (PSLI 17–19); petiolar node in profile relatively higher, in profile
1.2 to 1.3 times higher than long (LPeI 77–82); strongly bicoloured species with
dark brown or black gaster contrasting with light brown to reddish brown
remainder of body
Tanzania, Zimbabwe - decem
||Generally smaller species (WL
0.85–0.98); propodeal teeth relatively shorter (PSLI 9–13); petiolar node relatively lower, in profile around 1.0 to
1.2 times higher than long (LPeI 86–100); usually of uniform brown colour, if
bicoloured, then only slightly so and never as well developed as above
||Smaller eyes (OI 33–36); HL 0.62-0.70, HW 0.48-0.58; body
colouration uniformly light brown to chestnut brown
||Cameroun & East
Africa - ultor
||Larger eyes (OI 37–40); HL 0.64-0.71, HW 0.51-0.59; body
colouration uniformly dark brown to black, always darker than above.
east to Uganda - venator
© 2007, 2011, 2012, 2015 - Brian Taylor CBiol FSB FRES
11, Grazingfield, Wilford, Nottingham, NG11 7FN, U.K.