The Ants of Africa
Genus Dorylus - Subgenus Anomma
Dorylus (Anomma) sjoestedti Emery new status

SJOESTEDTI group - characterised by the head being widest at the anterior end and narrowing significantly from front to back, with almost straight sides and sharp posterior angles; the latter never produced into distinct teeth (unlike wilverthi).

Dorylus (Anomma) sjoestedti Emery new status

return to key {link to the Hymenoptera Name Server} Type locality Cameroun (Dorylus nigricans Ill. subsp. Sjöstedti n. subsp., Emery, 1899e: 461, worker; soldier by Santschi, 1912b: 160; queen by Raignier & van Boven, 1955: 98); workers and queen known (as in Bolton, 1995, but Emery appears to have described the "major") .

{Dorylus (Anomma) sjoestedti}Emery's (1899e) description is at {original description}.

Raignier & van Boven (1955, p 26) cite the original descriptions by Emery (1899e) and Santschi (1912b). Emery compared the specimen with arcens - head entirely matt and narrowed to the rear as arcens; posterior corners more pointed; petiole strongly resembling that of wilverthi narrower and more elongated. Santschi noted the sjoestedti funiculus had the penultimate segment three times as long as wide and twice the previous segment; but Raignier & van Boven found this incorrect with the segment no more than twice as long as wide, and often less.

At Yangambi, Raignier & van Boven (1955, p 72-74) made seven collections of sjoestedti, totalling 195 specimens. Their descriptive notes give -
TL range ca 13-3.6 mm; overall colour red-brown to red-black; major with head matt, sometimes shiny posteriorly; CI 100 or slightly more; posterior with sharp prominent angles; petiole with small posteroventral angles (not consistently so).

Wheeler (1922) listed other findings from Cameroun (Yukuduma, by Funck; Grand Batanga and Lolodorf by G. Schwab); and Congo (at Samkita, by F. Faure).


{Dorylus sjoestedti type major worker The photomontage of the type major worker is collated from Note: The scales on the original Antweb images clearly are wrong, they are the smaller lines on my collation, and I have added scales that give sizes, e.g HW = 3.6 mm, as in Emery (1899e).

Oxford University Museum specimens

Dorylus (Anomma) sjoestedti
B Taylor det.

A Fotso Kuate
Dorylus nigricans
03°54'30" N
11°25'58" E
Pitfall in fallow
Dorylus (Anomma) sjoestedti
B Taylor det.
S Uehara

Kalinzu Forest
0°23'22.7" S
30°5'33.3" E
S of 714(E),


Dorylus sjoestedti majorPolymorphism

The various morphs are shown in detail on the Cameroun specimens page and the Uganda morphs page.

Dorylus sjoestedti majorCameroun major

Mangomo; collector A Fotso Kuate (fk dorylus nigricans)

© 2007, 2008, 2010, 2011, 2012 - Brian Taylor CBiol FSB FRES
11, Grazingfield, Wilford, Nottingham, NG11 7FN, U.K.