Dorymyrmex flavopectus

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Dorymyrmex flavopectus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Dolichoderinae
Tribe: Leptomyrmecini
Genus: Dorymyrmex
Species: D. flavopectus
Binomial name
Dorymyrmex flavopectus
Smith, M.R., 1944

Dorymyrmex flavopectus casent0103887 profile 1.jpg

Dorymyrmex flavopectus casent0103887 dorsal 1.jpg

Specimen labels

An attractive species of the highly drained, infertile rosemary scrub and open sand pine woodlands of peninsular Florida.


Trager (1988) - Head, except near base of mandibles, and gaster uniform dark brown; thorax clear orange-yellow; slenderer and with somewhat longer legs and scapes than Dorymyrmex bureni: colonies polycalic, interconnected by trails.

D. flavopectus workers from the Ocala National Forest are notably larger than those from Highlands Co., where the types were collected. Northern specimens have HTL 1.90-2.25 mm, while Highlands Co. specimens have HTL 1.70-.2.00. Specimens from the 2 localities are alike in all other respects.

Keys including this Species


Dorymyrmex flavopectus is restricted to stands of Florida rosemary, Ceratiola ericoides Michaux, including those in early stages of succession to sand pine woodland in the sterile, highly drained, white "sugar sands" of central Florida.

Distribution based on Regional Taxon Lists

Nearctic Region: United States (type locality).
Neotropical Region: Mexico.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb


Trager (1988) - The only other Dorymyrmex likely to be encountered in the habitat occupied by D. flavopectus is Dorymyrmex bossutus, though of course Dorymyrmex bureni is found along roads through such areas. D. flavopectus is spottily distributed, and though much apparently suitable habitat is not occupied, where found it is conspicuous by its polycalic colonies; the several nests occupied by each colony are interconnected in clement conditions by well-travelled trails of the strikingly colored workers. Nests are difficult to excavate in the fine, crumbly sand, but are apparently shallow and many-branched. Queens have never been taken.



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

  • flavopectus. Dorymyrmex pyramicus subsp. flavopectus Smith, M.R. 1944d: 15 (w.) U.S.A. Combination in Conomyrma: Kusnezov, 1952g: 430; in Dorymyrmex: Shattuck, 1992c: 85. Raised to species: Kusnezov, 1952g: 430. See also: Snelling, R.R. 1973b: 4; Buren, Nickerson & Thompson, 1976: 306; Trager, 1988: 22; Johnson, C. 1989b: 192 (in key).

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

Trager (1988):



HL 0.78-1.00, HW 0.63-0.90, SL 0.88-1.14, EL 0.18-0.24, FL 0.80-1.03, WL 1.00-1.43, HTL 1. 78-2.43, CI 80.8-90.0, SI 126.4-142.0, OI 21.2-24.5, FI 96.4-106.3, TI 128.2-143.0. N =26. (Holotype not measured)

General form and characters as in figures and in key.

Head broadest at or slightly below midpoint of eye, converging more strongly toward mandibles; occipital border straight to weakly convex; promesonotal curvature as in Fig. 11, generally less arched than that of D. bureni, though variable in both species; propodeal cone a little higher and sharper than in D. bureni and apparently deflected to rear in most specimens.

Mandibular striae as in Dorymyrmex bureni; tessellation of body surface of larger "mesh" than that of D. bureni, so D. flavopectus shinier overall, in spite of having longer, more conspicuous pubescence on head and gaster.

Color pattern unique; mandibles, clypeus, and thorax, especially the latter, clear uninfuscated orange-yellow, or rarely there is faint infuscation near lower lateral edges of pronotum; underside and coxae dark brown, at some viewing angles showing through edges of nota giving illusion of infuscation; head and gaster piceous brown; gaster appears grayer because of long whitish pubescence; legs dark brown. Among sympatric species, only Dorymyrmex bossutus may approximate this color pattern, but is smaller, shinier and with thorax browner than D. flavopectus.

Type Material

Five paratypes: Archbold Biological Station, Lake Placid. Florida. Aug. 24 1943. #35. T. C. Schnierla. (at U. S. National Museum).

Smith (1944) lists a holotype and 12 paratypes as the material upon which he based his description. Only 5 specimens from the type series are now found at the U. S. National Museum, none of them labeled as a holotype. I have not chosen a lectotype, since the holotype may be rediscovered. These specimens have slightly different collection data than those listed in Smith's description.


D. flavopectus derives from Latin flavus (yellow) plus pectus (chest) referring to the striking yellow thorax of workers of this species. The name is a noun in apposition, and is not modified to agree in gender with Dorymyrmex.


  • Buren, W. F.; Nickerson, J. C.; Thompson, C. R. 1976 [1975]. Mixed nests of Conomyrma insana and C. flavopecta - Evidence of parasitism (Hymenoptera: Formicidae). Psyche (Camb.) 82: 306-314 (page 306, see also)
  • Johnson, C. 1989b. Taxonomy and diagnosis of Conomyrma insana (Buckley) and C. flava (McCook) (Hymenoptera: Formicidae). Insecta Mundi 3: 179-194 (page 192, see also (in key))
  • Kusnezov, N. 1952j [1951]. El estado real del grupo Dorymyrmex Mayr (Hymenoptera, Formicidae). Acta Zool. Lilloana 10: 427-448 (page 430, Combination in Conomyrma)
  • Kusnezov, N. 1952j [1951]. El estado real del grupo Dorymyrmex Mayr (Hymenoptera, Formicidae). Acta Zool. Lilloana 10: 427-448 (page 430, Raised to species)
  • Shattuck, S. O. 1992c. Generic revision of the ant subfamily Dolichoderinae (Hymenoptera: Formicidae). Sociobiology 21: 1-181 (page 85, Combination in Dorymyrmex)
  • Smith, M. R. 1944d. Additional ants recorded from Florida, with descriptions of two new subspecies. Fla. Entomol. 27: 14-17 (page 15, worker described)
  • Snelling, R. R. 1973b. The ant genus Conomyrma in the United States (Hymenoptera: Formicidae). Contr. Sci. (Los Angel.) 238: 1-6 (page 4, see also)
  • Trager, J. C. 1988a. A revision of Conomyrma (Hymenoptera: Formicidae) from the southeastern United States, especially Florida, with keys to the species. Florida Entomologist. 71:11-29. (page 22, see also)