Tetramorium species groups

It is convenient to organize the species by region. Most of the recent taxonomic treatments have revised species based on geography. The contents of this page is organizing information from many papers (see the references at the bottom of the page), with much work still in progress.

Afrotropical region Tetramorium
More than half of the ~ 450 species occur in this region.

Key to the Afrotropical weitzeckeri-group species.

Indo-Australian
Key to the Australian Tetramorium

Malagasy Tetramorium
The species of the Malagasy region can be placed into 14 species groups.

Key to Malagasy Tetramorium species groups

Tetramorium bicarinatum species group
A number of species in this group are tramp species. There are three members of the group in the Malagasy region.


 * ''Tetramorium bicarinatum
 * ''Tetramorium insolens
 * ''Tetramorium pacificum

Tetramorium bessonii species group
An endemic Malagasy group with 5 species.

Tetramorium dysalum species group
The group has 2 described and more than 15 undescribed species. All appear to be endemic to the Malagasy region.

Tetramorium marginatum species group
An endemic Madagascar group comprised of 6 species.

Tetramorium New Species Group 1
An endemic Madagascar group comprised of 8 species.

Tetramorium obesum species group
The single member of this group that occurs in the Malagasy species is well known is a well known, widespread tramp species.


 * ''Tetramorium lanuginosum

Tetramorium ranarum species group
An endemic species group only found in the Malagasy region that holds 7 valid and more than 25 tentatively undescribed species.

Tetramorium schaufussii species group
An endemic Madagascar group that includes 6 described species and possibly dozens more that are undescribed.

Tetramorium sericeiventre species group
This group is present in the Malagasy region in the form of two species, one of which is shared with the Afrotropical and Southern Palaearctic regions, while the other represents a new species (T. mahafaly) endemic to Madagascar.


 * ''Tetramorium mahafaly
 * ''Tetramorium sericeiventre

Tetramorium severini species group
This species group contains a single species, T. severini, that is one of the most conspicuous Tetramorium species found in Madagascar.


 * Tetramorium severini

Tetramorium simillimum species group
This group includes species from other regions. Within the Malagasy region there are 5 described species and potentially 2 new species.

Tetramorium tortuosum species group
This group is widespread and present in most zoogeographic regions except the Palaearctic. Nevertheless, the highest species richness can be found in the Oriental and Indo-Australian regions while the Afrotropics and the New World are relatively species-poor. In the Malagasy region it is represented by 7 described species and around 10 new species.

Tetramorium tosii species group
An apparently endemic group from the Malagasy region.


 * ''Tetramorium tantillum
 * ''Tetramorium tosii

Tetramorium weitzeckeri species group
1 representative Tetramorium humbloti

New World Tetramorium
Relatively depauperate with just 13 species.

Palaearctic Tetramorium
See Steiner et al., 2005; Schlick-Steiner et al., 2006a; Csösz et al., 2007; Csösz & Schulz, 2010; Steiner et al., 2010.