Perissomyrmex

Identification
Xu and Zhang (2012) - The genus Perissomyrmex is most similar to Pristomyrmex in the tribe Myrmecinini, but mandibles rectangular, with two basal teeth on the masticatory margin; clypeus without longitudinal central carina; antennae nine-segmented; antennal scrobes absent; pronotum without teeth; anteroventral corner of mesopleuron not extruding; propodeal lobes short and obtuse at apices; sting usually not extruding; head and mesosoma striate.

Species richness
Species richness by country based on regional taxon lists (countries with darker colours are more species-rich). View Data



Nomenclature

 *  PERISSOMYRMEX [Myrmicinae: Myrmecinini]
 * Perissomyrmex Smith, M.R. 1947i: 281. Type-species: Perissomyrmex snyderi, by original designation.

Worker
Xu and Zhang (2012) - Weakly dimorphic terrestrial myrmicine ants with the following combination of characters.

1. Head nearly square, slightly divergent forward.

2. Mandibles elongate and roughly rectangular; inner margin long, with distinct triangular tooth; masticatory margin short, with apical tooth, subapical tooth, diastema, and basal tooth.

3. Palp formula 4, 2.

4. Anterior clypeal margin protruding, with developed teeth or lobes, and significantly notched or depressed between teeth or lobes; posterior extension between antennal sockets roughly triangular.

5. Frontal lobes absent; frontal carinae poorly developed.

6. Antennal sockets exposed.

7. Antennae nine-segmented, scapes reach to or surpass occipital corners; antennal clubs three-segmented.

8. Antennal scrobes absent.

9. Eyes developed and convex, situated at about midpoints of lateral sides of head, or slightly behind midpoints.

10. Promesonotal profile is a convexity distinctly higher than propodeum.

11. Promesonotal suture present and weakly impressed.

12. Metanotal groove deeply depressed.

13. Propodeal spines developed, long and acute.

14. Propodeal spiracles circular, situated in middle of lateral surfaces of propodeum.

15. Propodeal lobes short and obtuse at apices.

16. Petiole pedunculate anteriorly, the petiolar spiracles situated at about midlength of peduncle; petiolar node roughly triangular or trapezoidal, with distinct anterodorsal corner, posterodorsal corner usually indistinct and rounded. Subpetiolar process usually reduced, sometimes weakly toothed.

17. Postpetiolar node roughly triangular and strongly inclined backward, anteroventral corner of postpetiole toothed.

18. Head and mesosoma usually strongly striate.

19. Pilosity abundant.