Dorylus (Anomma) sjoestedti Emery new status

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") .

Emery's (1899e) description is at .

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).

Workers

The photomontage of the type major worker is collated from http://www.antweb.org/specimen.do?name=casent0915645. 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.	Cameroun A Fotso Kuate Dorylus nigricans	19.vi.2005 Mangomo 03°54'30" N 11°25'58" E	Pitfall in fallow	2
Dorylus (Anomma) sjoestedti B Taylor det.	Uganda S Uehara III-136	23.xi.2002 Kalinzu Forest 0°23'22.7" S 30°5'33.3" E	S of 714(E), forest	6

Polymorphism

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

Cameroun major

Mangomo; collector A Fotso Kuate (fk dorylus nigricans)