Tetramorium voasary

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Tetramorium voasary
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Tetramorium
Species: T. voasary
Binomial name
Tetramorium voasary
Hita Garcia & Fisher, 2012

Tetramorium voasary casent0049240 p 1 high.jpg

Tetramorium voasary casent0049240 d 1 high.jpg

Specimen Labels

This new species is distributed in the rainforests and montane rainforests of eastern Madagascar from Befotaka-Midongo in the south to Makirovana in the northeast. The distribution range is comparatively large, but localities where T. voasary was encountered are often widely separated. Despite being known from approximately ten localities, T. voasary was collected relatively rarely with less than 25 specimens in total. One explanation might be that the species lives and forages in vegetation; it was mostly collected from lower vegetation, and only rarely from the ground or leaf litter. (Hita Garcia and Fisher 2012)


A member of the Tetramorium andrei species complex of the Tetramorium tortuosum-species group.

Hita Garcia and Fisher (2012) - Tetramorium voasary can be clearly distinguished from the remainder of the species complex by the following character combination: eyes moderately sized (OI 21 - 24); propodeal spines long to very long (PSLI 35 - 39); petiolar node rectangular nodiform but with relatively rounded anterodorsal and posterodorsal angles; posterodorsal corner of petiolar node not strongly protruding posteriorly; postpetiole in dorsal view usually slightly longer than wide, rarely as wide as long or longer than wide (DPpI 95 - 101); body uniform bright orange in colour.

Tetramorium electrum, Tetramorium elf, Tetramorium isectum, Tetramorium isoelectrum, or Tetramorium nify all have much smaller eyes (OI 15 - 19) than T. voasary. The remaining three species, Tetramorium ala, Tetramorium andohahela, and Tetramorium andrei, all have a petiolar node with well-defined antero- and posterodorsal margins while the node of T. voasary has fairly rounded margins. This character is shared with T. elf and T. isoelectrum, although they are not likely to be confused with T. voasary. Apart from the small eyes mentioned above, the first two also have extremely long propodeal spines (PSLI 58 - 64) that contrast with the shorter spines of T. voasary (PSLI 35 - 39).

Keys including this Species


Latitudinal Distribution Pattern

Latitudinal Range: 23.83517° to -15.03333333°.

Tropical South

Distribution based on Regional Taxon Lists

Malagasy Region: Madagascar (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.


Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.




Images from AntWeb

Tetramorium voasary casent0123392 p 1 high.jpgTetramorium voasary casent0123392 h 1 high.jpgTetramorium voasary casent0123392 d 1 high.jpgTetramorium voasary casent0123392 l 1 high.jpg
Worker. Specimen code casent0123392. Photographer Estella Ortega, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.
Tetramorium voasary casent0247162 h 1 high.jpgTetramorium voasary casent0247162 d 1 high.jpgTetramorium voasary casent0247162 p 1 high.jpgTetramorium voasary casent0247162 l 1 high.jpg
Holotype of Tetramorium voasaryWorker. Specimen code casent0247162. Photographer Estella Ortega, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.
Tetramorium voasary casent0488650 h 1 high.jpgTetramorium voasary casent0488650 p 1 high.jpgTetramorium voasary casent0488650 d 1 high.jpgTetramorium voasary casent0488650 l 1 high.jpg
Worker. Specimen code casent0488650. Photographer Estella Ortega, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.


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

  • voasary. Tetramorium voasary Hita Garcia & Fisher, 2012: 45, figs. 60, 71, 72, 99-101, 141 (w.) MADAGASCAR.

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



HL 0.94 - 1.23 (1.07); HW 0.87 - 1.15 (0.98); SL 0.70 - 0.99 (0.81); EL 0.18 - 0.27 (0.23); PH 0.49 - 0.59 (0.53); PW 0.69 - 0.80 (0.73); WL 1.20 - 1.49 (1.36); PSL 0.36 - 0.46 (0.39); PTL 0.32 - 0.36 (0.35); PTH 0.37 - 0.42 (0.40); PTW 0.29 - 0.34 (0.31); PPL 0.34 - 0.42 (0.38); PPH 0.36 - 0.43 (0.39); PPW 0.34 - 0.41 (0.38); CI 88 - 93 (92); SI 80 - 89 (82); OI 21 - 24 (23); DMI 52 - 58 (54); LMI 38 - 42 (39); PSLI 35 - 39 (37); PeNI 41 - 47 (43); LPeI 85 - 93 (89); DPeI 85 - 94 (90); PpNI 48 - 55 (52); LPpI 90 - 104 (97); DPpI 95 - 101 (98); PPI 113 - 125 (120) (ten measured).

Head distinctly longer than wider (CI 88 - 93). Posterior head margin weakly concave. Anterior clypeal margin medially impressed. Frontal carinae strongly developed, diverging posteriorly, and ending at corners of posterior head margin. Antennal scrobes weakly developed, shallow, narrow, and without defined posterior and ventral margins. Antennal scapes comparatively moderately long, not reaching posterior head margin (SI 80 - 89). Eyes small to moderately sized (OI 21 - 24). Mesosomal outline in profile flat to weakly convex, moderately marginate from lateral to dorsal mesosoma; promesonotal suture and metanotal groove absent; mesosoma comparatively stout and high (LMI 38 - 42). Propodeal spines long to very long, spinose, and acute (PSLI 35 - 39); propodeal lobes short, triangular, and rounded, rarely acute. Petiolar node in profile rectangular nodiform with fairly rounded margins, around 1.1 to 1.2 times higher than long (LPeI 85 - 93), anterior and posterior faces approximately parallel, anterodorsal and posterodorsal margins approximately at same height, dorsum weakly to moderately convex; node in dorsal view around 1.1 to 1.2 times longer than wide (DPeI 85 - 94). Postpetiole in profile globular, ranging from weakly longer than high to 1.1 times higher than long (LPpI 90 - 104); in dorsal view ranging from weakly longer than wide to feebly wider than long (DPpI 95 - 101). Postpetiole in profile appearing approximately as voluminous as petiolar node, in dorsal view approximately 1.1 to 1.3 times wider than petiolar node (PPI 113 - 125). Mandibles distinctly longitudinally rugose, sometimes weakly so; sculpture on clypeus variable, often longitudinally rugulose with three to five rugulae, sometimes more irregularly rugulose; cephalic dorsum between frontal carinae with seven to ten longitudinal rugae, rugae often broken or with cross-meshes; lateral and ventral head mostly reticulate-rugose. Mesosoma laterally and dorsally mainly longitudinally rugose. Forecoxae usually completely unsculptured, smooth, and shiny, sometimes with partial superficial sculpture. Waist segments rugulose, usually longitudinally so. Generally ground sculpture everywhere on body faint to absent. First gastral tergite unsculptured, smooth, and shining. All dorsal surfaces of head, mesosoma, waist segments, and gaster with abundant, long, and fine standing hairs. Anterior edges of antennal scapes with suberect to erect standing hairs. Body of bright orange to light orange brown colour.

Type Material

Holotype worker, MADAGASCAR, Toamasina, Montagne d'Anjanaharibe, 19.5 km 27° NNE Ambinanitelo, 15.17833 S, 49.635 E, 1100 m, montane rainforest, canopy moss and leaf litter, collection code BLF08213, 12.-16.III.2003 (B.L. Fisher, C. Griswold et al.) (California Academy of Sciences: CASENT0247162). Paratypes, 11 workers with same data as holotype (CASC: CASENT0497903; CASENT0497904; CASENT0497905; CASENT0497906); and one worker with same data as holotype except sampled from beating low vegetation and collection code BLF08151 (CASC: CASENT0489080).


The species epithet is an arbitrary combination of letters.


References based on Global Ant Biodiversity Informatics

  • Hita Garcia F., and B. L. Fisher. 2012. The ant genus Tetramorium Mayr (Hymenoptera: Formicidae) in the Malagasy region—taxonomic revision of the T. kelleri and T. tortuosum species groups. Zootaxa 3592: 1-85.