The Ants of Africa
Genus Dorylus - Subgenus Anomma
Dorylus (Anomma) mayri Santschi

ARCENS group - characterised by the large head, very bulbous in profile and trapezoidal in full-face view.

Dorylus (Anomma) mayri Santschi

return to key {link to the Hymenoptera Name Server} Type locality Cameroun (Dorylus (Anomma) Mayri n. sp., Santschi, 1912b: 159, illustrated, worker) no location; worker only known (see Bolton, 1995) .

{Dorylus (Anomma) mayri}Santschi's (1912b) description is at {original description} - he emphasised that he probably had not seen the major or soldier, hence his image, of a 10 mm worker, has to be regarded with caution (I would not expect to see the extra teeth on the mandibles if it were a major).

Raignier & van Boven (1955) cite Santschi's original description from 3 specimens from Cameroun (passed to him by Emery, from Mayr). Santschi thought of it as a cousin of arcens but probably with a very large worker.

The key features are - antennal scape long and slender (width no more than 20% of length); petiole posterior no wider than anterior and twice as long as wide (as in wilverthi, although that has a petiole which is slightly wider posteriorly) rounded ventro-posterior teeth.

{Dorylus mayri worker} The photomontage of a type worker is collated from Clearly no more than a media worker, from the subapical teeth on the mandible.

Oxford University Museum specimens

Dorylus (Anomma) mayri
B Taylor det.

S Uehara
sample III-135

Kalinzu Forest
023'22.7" S
305'33.3" E
near Sunzu path in forest

{Dorylus mayri polymorphism}Polymorphism

The photomontages are of specimens collected in the Kalinzu Forest, Uganda (sample III-135, 21.xi.2002; by Shigeo Uehara). The major and other morphs, lacking the second media morph that probably would have matched Santschi's description (above), are shown on the polymorphism montage. The major morph is very large as predicted by Santschi.

The various morphs are shown in detail on the Dorylus (Anomma) mayri morphs page.

{Dorylus mayri major}Full new description - Uehara III-135
Overall - shiny matt mostly yellow brown, with apex of head and mandibles much darker, also dark on much of the gaster brown with distinct yellow brown apical bands to each tergite; yellow brown scapes, funiculi and legs
TL 13.1 HW 4.10 HL 3.60 HD 2.75 CI SL 1.2 SI AL 4.0 PW 1.1 PetL 1.0 GL 4.50 MFL 3.0
Head - trapezoid, widest pre-anterior, posterior little more than 1/2 as wide, sides weakly convex, rear third more convex and angled inward; posterior margin quite deep scallop, with very slight median outward bump, posterolateral angles sharp; sculpturation of extremely fine spiculation, almost effaced on posterior half of face, which has very minute and very sparse hair pits; median line always visible, clearly impressed in anterior third; clypeal margin a concave arc, with frontal carinae giving rise to distinct anterior points; median hair, very fine pair away from midpoint; mandible polished, very long but quite thick with a moderate basal tooth, hardly visible hair pits; scape very short, not reaching sides of head when directed laterally, moderately thick, broadening from base to apex, near smooth; funiculus segments progressively lengthening and widening; apex no more than 1/3 longer than 9; head in profile very bulbous, posterior corners fairly acute angles; hairs barely visible @ 32x.
Alitrunk - in profile a shallow dome; distinct and shallowly convex "saddle"; spiracle an angled oval rearward facing with top more forward than bottom; dorsum of propodeum long slightly convex and lower at posterior, declivity short and vertical with incurve at bottom; metapleural gland with upper margin distinctly longer than lower; all over very fine spiculation; hairs none.
Petiole - moderately long, flat dorsum, posterior face vertical but not in turned; dorsum first two-thirds parallel sides then widening front to back; posterior ventral processes well devoloped; spiracle small but distinctly raised; subpetiolar process a quite small triangle; sculpturation as alitrunk; pair of hairs on posterior dorsum, several hairs below.
Gaster - first segment much narrow anteriorly, sternite with notches to accomodate postero-lateral processes of petiole; all segments shiny; hairs sparse on posterior margins but long fringe on posterior of first tergite; very short and sparse pilosity on apical two segments.
Legs - coxae moderately long but more rounded outer surface; femora broad, without spiculation; tibiae moderately wide, almost no pilosity; tarsae long and slender, finely bristly, large claws.

{Dorylus mayri minima} Minima morph
Unusually small for the subgroup; head shiny, colour dark orange brown; lateral clypeus very narrow; dorsum with fine decumbent pilosity.

2007, 2011, 2012, 2014 - Brian Taylor CBiol FSB FRES
11, Grazingfield, Wilford, Nottingham, NG11 7FN, U.K.