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The holotype worker of this monotypic genus was collected in an evergreen forest in Taiwan.

At a Glance • Monotypic  


Terayama (2009) - Formosimyrma is a member of the Solenopsidini tribe in the Subfamily Myrmicinae. Within the genera of tribe Solenopsidini, this genus most resembles the genus Mayriella, distributed from Nepal through Southeast Asia into Papua New Guinea and Australia to New Zealand. However, it is distinguished from the latter by the median portion of clypeus with a thin and high longitudinal wall (anterior margin of clypeus armed with a pair of sharp teeth just above the mandibles in Mayriella), 8-segmented antennae (10-segmented in Mayriella), and oval eyes (eyes elongate and lower section narrows into a point in Mayriella)

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Keys including this Genus



Distribution and Richness based on AntMaps

Species by Region

Number of species within biogeographic regions, along with the total number of species for each region.

Afrotropical Region Australasian Region Indo-Australian Region Malagasy Region Nearctic Region Neotropical Region Oriental Region Palaearctic Region
Species 0 0 0 0 0 0 1 0
Total Species 2841 1736 3045 932 835 4379 1741 2862





The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • FORMOSIMYRMA [Myrmicinae: Solenopsidini]
    • Formosimyrma Terayama, 2009: 158. Type-species: Formosimyrma lanyuensis, by original designation.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.



Diagnosis of worker. Monomorphic terrestrial myrmicine ants with the following combination of characters.

  1. Mandible broad triangle, with 7 teeth.
  2. Median portion of clypeus with a thin and high longitudinal wall; the wall well produced anteriorly in full face view.
  3. Frontal lobes narrow, connected each other, and produced and covered to the level of anterior margin of clypeus.
  4. Frontal carinae and antennal scrobes developed.
  5. Eye small and oval, positioned in front of the midlength of the sides of the head.
  6. Antenna 8-segmented; scape short, apical 2 segments froming a distinct club.
  7. Mesosoma short and stout; promesonotal dorsum convex in profile.
  8. Metanotal groove present.
  9. Propodeum with a pair of acute teeth.
  10. Petiole with long peduncle and reversed U-shape node.
  11. Postpetiole higher than long.
  12. Middle and hind tibiae without tibial spur.


Formosi, old name of Taiwan, 'Formosa' + myrma, Gr., ant.