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Petalomyrmex phylax
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Plagiolepidini
Genus: Petalomyrmex
Snelling, R.R., 1979
Type species
Petalomyrmex phylax
Single species: P. phylax

Petalomyrmex phylax casent0101210 profile 1.jpg

Petalomyrmex phylax

Petalomyrmex phylax casent0101210 dorsal 1.jpg

Specimen Label



Distribution and Richness based on AntMaps

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The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • PETALOMYRMEX [Formicinae: Plagiolepidini]
    • Petalomyrmex Snelling, R.R. 1979: 5. Type-species: Petalomyrmex phylax, by original designation.

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



Monomorphic. Head cordate in frontal view. Apical margin of mandible oblique, with six distinct teeth, basal somewhat offset. Maxillary and labial palpi three-segmented. Median lobe of clypeus broader than long, entire apical margin of clypeus continuously gently convex; basal margin at about midpoint of antenna I sockets, lateral margin confluent with antennal sockets. Antennal scape reaching occipital margin; flagellum eight-segmented, without distinct club, only first and last segments longer than broad. Eye oval, at about middle of side of head; distance between eye and antennal socket much greater than distance between eye and margin of head in frontal view. Ocelli small but distinct, placed little below occipital margin. Occipital lobes distinct.

Mesosoma much as in Aphomomyrmex, but metanotum, in profile, distinctly convex and with spiracle minute, dorsal; opening of metapleural gland with a few long guard hairs.

Legs as in Aphomomyrmex.

Petiole about as in Aphomomyrmex, but spiracle about one-third of distance from base to summit of scale.

Head and body without appressed pubescence but with conspicuous erect hairs of varied length on all areas, including appendages.


Head about as in worker but occipital margin broadly concave so that head is not truly cordate. Mandible eight-toothed. Eye large, lateral, slightly below middle of side of head. Ocelli slightly enlarged, near occipital margin. Flagellum nine-segmented.

Mesosoma conspicuously flattened. Mesonotum flat, broader than long. Scutellum, metanotum and propodeum, in profile, continuously oblique.

Wings as in Aphomomyrmex.

Node of petiole low and thick in profile, with spiracle near summit; from above about twice wider than long; summit, from behind, much wider than base, broadly concave.

Gaster somewhat elongate.

Pilosity as in worker.


The following references are based on the 2007 CD version of the New General Catalogue.

  • Agosti, D. 1991. Revision of the oriental ant genus Cladomyrma, with an outline of the higher classification of the Formicinae (Hymenoptera: Formicidae). Syst. Entomol. 16: 293-310 (page 296, Petalomyrmex in Formicinae, Pseudolasius genus group)
  • Bolton, B. 1994. Identification guide to the ant genera of the world. Cambridge, Mass.: Harvard University Press, 222 pp. (page 50, Petalomyrmex in Fomicinae, Brachymyrmecini)
  • Bolton, B. 1995b. A new general catalogue of the ants of the world. Cambridge, Mass.: Harvard University Press, 504 pp. (page 316, Petalomyrmex in Fomicinae, Brachymyrmecini)
  • Bolton, B. 2003. Synopsis and Classification of Formicidae. Mem. Am. Entomol. Inst. 71: 370pp (page 104, Petalomyrmex in Fomicinae, Plagiolepidini)
  • Hölldobler, B.; Wilson, E. O. 1990. The ants. Cambridge, Mass.: Harvard University Press, xii + 732 pp. (page 18, Petalomyrmex in Formicinae, Myrmelachistini)
  • Snelling, R. R. 1979a. Three new species of the Palaeotropical arboreal ant genus Cataulacus (Hymenoptera: Formicidae). Contr. Sci. (Los Angel.) 315: 1-8 (page 5, Petalomyrmex as genus)
  • Wheeler, G. C.; Wheeler, J. 1985b. A simplified conspectus of the Formicidae. Trans. Am. Entomol. Soc. 111: 255-264 (page 258, Petalomyrmex in Fomicinae, Brachymyrmecini)

Additional References

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