Threat Level: Low

Strumigenys rogeri is a minute reddish species with a triangular head, linear mandibles, six-segmented antennae with a two-segmented antennal club, antennal scrobes, spongiform appendages on the waist, and spatulate hairs on the dorsal surfaces of the waist and gaster. Like all myrmicines, S. rogeri also has a two-segmented waist and a gaster armed with a sting.

Strumigenys godeffroyi is the only other ant included in PIAkey from the genus Strumigenys, and it shares the same general appearance as S. rogeri. There are many characters for separating the species, however. Strumigenys rogeri has two preapical teeth, a notch on the ventral portion of the head and spatulate hairs on the waist and gaster. Strumigenys godeffroyi, in contrast, has one preapical tooth, no notch on the ventral portion of the head and flagellate hairs on the waist and gaster.

Pyramica is closely related to Strumigenys, and both are genera within the tribe Dacetini. The most reliable character for separating P. membranifera from the two species of Strumigenys included in PIAkey is the shape of the mandibles. The mandibles of P. membranifera are triangular, and those of the Strumigenys are linear.

he tribe Dacetini is very diverse, and its species can be difficult to identify because of their minute size and subtle morphological differences. There are many native species and introduced species of dacetines in the Pacific. If the species included in PIAkey do not match the specimen in question, explore images on Antweb or use the keys published by Wilson and Taylor (1967) or Bolton (2000) for identification confirmation.

Strumigenys rogeri is believed to be native to Africa, and is not known to cause significant damage to ecological or agricultural system, and is mostly restricted the forests. It is a relatively rare ant, despite its widespread distribution across the Pacific. The species is most commonly collected from forest leaf litter and is rarely seen foraging on the surface. Furthermore, S. rogeri does not typically recruit to baits or food resources.

Waist with two segments (petiole & postpetiole)
Propodeal spines present
Antennal club with two segments Antenna with a total of six segments
Head shape triangular
Mandibles triangular
Mandibles with two preapical teeth
Head with ventral notch present
Petiole, postpetiole & gaster with spatulate (shaped like a spatula) hairs

	S. rogeri	S. godeffroyi	P. membranifera
Head
Profile
Head shape	triangular	triangular	triangular
Mandible shape	linear	linear	triangular
Number of preapical teeth on mandible	two	one	(not applicable)
Head with ventral notch	present	absent	(not applicable)
Hairs on dorsum of petiole, postpetiole & gaster	spatulate (shaped like a spatula)	flagellate (long, thin & tapering)	(not applicable)
	S. rogeri	S. godeffroyi	P. membranifera

• Antweb: specimen images, data & maps
  
  
• Bolton, B. (1995) A new general catalogue of the ants of the world. Harvard University Press, Cambridge, Massachusetts, 504 pp.
  
  
• Wilson, E.O. & Taylor, R.W. (1967) The ants of Polynesia (Hymenoptera: Formicidae). Pacific Insects Monograph, 14, 1-109.