Crematogaster difformis

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Crematogaster difformis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Crematogaster
Species: C. difformis
Binomial name
Crematogaster difformis
Smith, F., 1857



Specimen Label


Nothing is known about the biology of Crematogaster difformis.


A member of the subgenus Physocrema. Hosoishi and Ogata (2009) - This species is similar to Crematogaster ampullaris and Crematogaster sewardi, but can be distinguished by the medially directed setae on the posterior portion of the fourth abdominal tergite.

Keys including this Species


Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo, Indonesia, Malaysia, Philippines, Singapore (type locality).
Oriental Region: Thailand.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb




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

  • difformis. Crematogaster difformis Smith, F. 1857a: 76 (w.) SINGAPORE. Emery, 1901g: 574 (q.); Forel, 1909d: 225 (m.); Wheeler, G.C. & Wheeler, J. 1952b: 261 (l.). Combination in C. (Physocrema): Forel, 1912f: 220. Senior synonym of edentata: Emery, 1901g: 574. [Name misspelled as deformis by Roger, 1863b: 37 and many subsequent authors.] See also: Hosoishi & Ogata, 2009b: 22.
  • edentata. Crematogaster edentata Mayr, 1867a: 104, pl. 2, fig. 10 (q.) INDONESIA (Java). Junior synonym of difformis: Emery, 1901g: 574.

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



Hosoishi and Ogata (2009) - HW 0.88–1.5; HL 0.84–1.34; CI 105–112; SL 0.74–1.06; SI 71–85; EL 0.15–0.28; PW 0.46–0.82; WL 1.01–1.74; PSL 0; PtL 0.26–0.48; PtW 0.19–0.4; PtH 0.15–0.26; PpL 0.16–0.28; PpW 0.2–0.4; PtHI 54–65; PtWI 74–95; PpWI 121–143; WI 90–107 (Three workers measured).

Workers with pronounced size polymorphism.

Scape just or not reaching posterior corner of head in large workers. Anterior-most portions of clypeus distinctly protruded anteriorly in large workers.

In lateral view, pronotum and mesonotum forming a single convexity; propodeum slightly raised relative to promesonotum. Anterior margin of pronotal collar slightly concave in dorsal view. Promesonotal suture sometimes visible in large workers. Metanotal groove convex posteriorly in dorsal view, deep and situated posteriorly to the posterior ridge of pronotum in lateral view; thorax strongly constricted in middle in dorsal view. In dorsal view, some longitudinal rugulae connecting between mesonotum and propodeum; the boundary distinct. Propodeal spiracle situated away from the metapleural gland orifice, the distance between them much greater than the propodeal spiracle diameter. Propodeal spines absent.

Clypeus sculptured with longitudinal rugulae.

Standing pilosity sparse on dorsal face of head, abundant on promesonotum. Dorsal face of head with decumbent setae. Clypeus with short setae. Fourth abdominal tergite with appressed setae. Dorsal setae on fourth abdominal tergite appressed and directed medially in the posterior portion.

Body color black.

Type Material

Hosoishi and Ogata (2009) - LECTOTYPE worker (large worker from SINGAPORE, TYPE HYM: 1017 1-2 / 6) (by present designation) and five paralectotype workers: one paralectotype worker from SINGAPORE; four paralectotype workers from MALAYSIA: Sarawak, Borneo (Oxford University Museum of Natural History) [examined]. We have not been able to examine type-material of C. edentata Mayr. Although Emery synomymised it with C. (P.) difformis, it is impossible to clarify the synonymy from the original description and figure.

The following notes on F. Smith type specimens have been provided by Barry Bolton (details):

Crematogaster difformis

Six worker syntypes in Oxford University Museum of Natural History. Labelled “Sing. 25” and “Sar. 33.” Both localities are recorded by Smith.


  • Attygalle, A. B.; Siegel, B.; Vostrowsky, O.; Bestmann, H. J.; Maschwitz, U. 1989. Chemical composition and function of metapleural gland secretion of the ant Crematogaster deformis Smith (Hymenoptera: Myrmicinae). Journal of Chemical Ecology 15:317-328.
  • Baltazar, C. R. 1966. A catalogue of Philippine Hymenoptera (with a bibliography, 1758-1963). Pac. Insects Monogr. 8: 1-488 (page 251, listed)
  • Emery, C. 1901i. Formiciden von Celebes. Zool. Jahrb. Abt. Syst. Geogr. Biol. Tiere 14: 565-580 (page 574, queen described)
  • Emery, C. 1901i. Formiciden von Celebes. Zool. Jahrb. Abt. Syst. Geogr. Biol. Tiere 14: 565-580 (page 574, Senior synonym of edentata)
  • Forel, A. 1909i. Ameisen aus Java und Krakatau beobachtet und gesammelt von Herrn Edward Jacobson. Notes Leyden Mus. 31: 221-232 (page 225, male described)
  • Forel, A. 1912g. Formicides néotropiques. Part III. 3me sous-famille Myrmicinae (suite). Genres Cremastogaster et Pheidole. Mém. Soc. Entomol. Belg. 19: 211-237 (page 220, Combination in C. (Physocrema))
  • Smith, F. 1857a. Catalogue of the hymenopterous insects collected at Sarawak, Borneo; Mount Ophir, Malacca; and at Singapore, by A. R. Wallace. [part]. J. Proc. Linn. Soc. Lond. Zool. 2: 42-88 (page 76, worker described)
  • Tanaka, H.O., Yamane, S. & Itioka, T. 2012. Effects of a Fern-Dwelling Ant Species, Crematogaster difformis, on the Ant Assemblages of Emergent Trees in a Bornean Tropical Rainforest. Ann. Entomol. Soc. Am. 105(4), 592-598 (doi:
  • Wheeler, G. C.; Wheeler, J. 1952b. The ant larvae of the myrmicine tribe Crematogastrini. J. Wash. Acad. Sci. 42: 248-262 (page 261, larva described)