Tetheamyrma

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Tetheamyrma
Tetheamyrma subspongia
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Tetheamyrma
Bolton, 1991
Type species
Tetheamyrma subspongia
Diversity
2 species
(Species Checklist, Species by Country)

Tetheamyrma subspongia casent0101593 profile 1.jpg

Tetheamyrma subspongia

Tetheamyrma subspongia casent0101593 dorsal 1.jpg

Specimen Label

Evolutionary Relationships



Cardiocondyla



Ocymyrmex






Nesomyrmex



Xenomyrmex





Terataner




Atopomyrmex



Cataulacus










Carebara



Diplomorium






Melissotarsus



Rhopalomastix






Calyptomyrmex



Tetramorium





Cyphoidris



Dicroaspis










Aretidris



Vollenhovia





Dacetinops



Indomyrma








Crematogaster



Meranoplus






Lophomyrmex




Adlerzia



Recurvidris






Stereomyrmex




Trichomyrmex





Eutetramorium




Royidris




Malagidris



Vitsika








Huberia



Podomyrma





Liomyrmex



Metapone













Kartidris



Mayriella





Tetheamyrma




Dacatria



Proatta









Dilobocondyla



Secostruma






Acanthomyrmex



Myrmecina





Perissomyrmex



Pristomyrmex









some Lordomyrma



Propodilobus





Lasiomyrma




[some Lordomyrma




Ancyridris



some Lordomyrma









Paratopula




Poecilomyrma




Romblonella



Rotastruma








Gauromyrmex



Vombisidris





Temnothorax




Harpagoxenus




Formicoxenus



Leptothorax













Based on Ward et al. (2014) and Blaimer et al. (2018).

The genus, comprised of two species, appears to be restricted to forests in good condition on Borneo and in the Philippines.

Identification

General and Buenavente (2018), changes in genus definition from Bolton (1991) are numbered

Monomorphic ants. Head and mesosoma densely rugoreticulate dorsally, laterally, and ventrally, except for smooth genal bridge. Head pilosity composed of fine hairs of varying lengths and flexibility.

Antennae with 10 - 11 segments, with very large 2-segmented apical club (1). Antennal scape short, just reaching or barely exceeding posterior margin of compound eye. Antennal scrobe absent. Compound eye small, located laterally, just forward of midlength of head. Frontal carina present or absent (2). Frontal lobe wide, completely concealing torulus, wider than median part of clypeus inserted between them. Posterior median clypeus narrowly inserted between frontal lobes. Anterior clypeus medially with a pair of setae straddling midpoint. Median clypeus narrowly bicarinate. Mandible triangular.

In lateral view, palp formula 2,2 (undissected). Mesosoma in profile with smoothly convex dorsal outline. Metanotal groove impressed or obsolete (3). Propodeum with short, acute, triangular spines. Infradental lamella between propodeal spine and metapleural lobe present or absent (4). Propodeal lobe low and rounded. Propodeal spiracle conspicuous, variable in location. Petiole sculptured. Anteroventral petiolar process present. Anteroventral postpetiolar process present or absent (5). Spongiform tissue on venter of petiole, postpetiole, and first gastral sternite present or absent (6). Spine absent from mesotibia and metatibia. Sting simple and functional.  

Distribution

Sabah, Malayasia.

Distribution and Richness based on AntMaps

Biology

Spongiform material on the waist segments and base of the gaster ventrally was previously known only in the tribe Dacetini and the non-dacetine genus Dacetinops. Tetheamyrma is not related to either of these and thus represents a third independent evolution of this feature, whose function remains unknown.

Castes

Morphology

Worker Morphology

  • Antennal segment count: 11
  • Antennal club: 2
  • Palp formula: 2,2
  • Total dental count: 5-8
  • Spur formula: 0, 0
  • Sting: present

Male Morphology

 • Caste unknown

Nomenclature

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

  • TETHEAMYRMA [Myrmicinae: Stenammini]
    • Tetheamyrma Bolton, 1991: 9. Type-species: Tetheamyrma subspongia, by original designation.

References