Strumigenys clypeata

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Strumigenys clypeata
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. clypeata
Binomial name
Strumigenys clypeata
Roger, 1863



Broadly distributed across the southeastern United States. From known specimen records, most taken from litter samples, it prefers moist forest habitat. Nest records are from soil cover, beneath stones, and rotten logs.


Bolton (2000) - A member of the clypeata group. Within the group clypeata is quickly identified. In full-face view it has an anteriorly broadly rounded glossy (when clean) clypeus, without visible bimargination; the clypeus dorsally has small dense appressed spatulate hairs and laterally has larger spatulate hairs that project as a regular anteriorly curved fringe; the lateral clypeal margins are convex and conceal the outer mandibular margins; it has a small but distinct basal mandibular gap at full closure and relatively fine small teeth, and has a number of flagellate hairs on the head.

Because of the somewhat variable length of the basal mandibular gap this common species is run out twice in the key.

Keys including this Species


Distribution based on Regional Taxon Lists

Nearctic Region: United States (type locality).

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb


Wesson and Wesson (1939) - A nest of S. clypeata was found in the duff at the base of a small pine tree a few inches from a colony of Myrmica punctiventris. The location was on a dry sandstone bluff in Jackson County, Ohio on which many colonies of Strumigenys pergandei had been found.

Brown (1964) - Buhl, Alabama, 2 nests in rotten chips, swampy river bottom forest. Howardsville, New Jersey, worker in rotten log in oak grove on sand. A worker from Donaldson, Arkansas, in forest debris (H. H. Ross and L. J. Stannard leg.).





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

  • clypeata. Strumigenys clypeata Roger, 1863a: 213 (w.) U.S.A. [Misspelled as clipeata in original description; justified emendation to clypeata by Mayr, 1887: 571.] Emery, 1895c: 328 (q.m.). Combination in S. (Cephaloxys): Emery, 1924d: 325; in S. (Trichoscapa): Smith, M.R., 1947f: 587; Creighton, 1950a: 304; in Smithistruma: Smith, M.R., 1951a: 827; Brown, 1953g: 58; in Pyramica: Bolton, 1999: 1673; in Strumigenys: Baroni Urbani & De Andrade, 2007: 117. See also: Wilson, 1954: 486; Smith, D.R. 1979: 1406; Bolton, 2000: 103.

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



Bolton (2000) - TL 2.0-2.3, HL 0.58-0.64, HW 0.38-0.42, CI 63-68, ML 0.09-0.10, MI 14-17, SL 0.29-0.32, SI 74-80, PW 0.26-0.30, AL 0.54-0.61 (15 measured).

Fully closed mandibles with a small but distinct basal gap between basal tooth and anterior clypeal margin; in general the gap shorter than the length of the basal tooth but subequal in some samples. Anterior clypeal margin broadly evenly rounded. Bimargination of anterior and lateral clypeal margins extremely feebly developed, the lower margin mostly overhung and concealed by the upper. Dorsum of clypeus shining when clean, with dense appressed short-spatulate small hairs. In full-face view lateral clypeal margins shallowly convex and concealing basal portions of outer margins of mandibles. Lateral clypeal margins with a row of anteriorly curved spatulate hairs that stand out from the surface, these hairs larger than those on the clypeal dorsum. Ground-pilosity on head behind clypeus narrowly spatulate to filiform. Dorsolateral margin of head with 2-3 projecting fine flagellate hairs and a pair present on the cephalic dorsum close to the occipital margin. Flagellate hairs present at pronotal humeri, on dorsa of pronotum and mesonotum, on first gastral tergite and on dorsal (outer) surfaces of hind tibia and basitarsus.

Type Material

Bolton (2000) - Syntype workers, U.S.A. Louisiana. [no types known to exist].


  • Baroni Urbani, C. & De Andrade, M.L. 2007. The ant tribe Dacetini: limits and constituent genera, with descriptions of new species. Annali del Museo Civico di Storia Naturale “G. Doria” 99:1-191.
  • Bolton, B. 1999. Ant genera of the tribe Dacetonini (Hymenoptera: Formicidae). Journal of Natural History. 33:1639-1689. PDF (page 1673, Combination in Pyramica)
  • Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028.
  • Brown, W. L., Jr. 1953. Revisionary studies in the ant tribe Dacetini. American Midland Naturalist. 50:1-137. PDF (page 58, Combination in Smithistruma, redescriptions of worker, queen, male)
  • Emery, C. 1895d. Beiträge zur Kenntniss der nordamerikanischen Ameisenfauna. (Schluss). Zool. Jahrb. Abt. Syst. Geogr. Biol. Tiere 8: 257-360 (page 328, queen, male described)
  • Emery, C. 1924f [1922]. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [concl.]. Genera Insectorum 174C: 207-397 (page 325, Combination in S. (Cephaloxys))
  • Forel, A. 1886a. Einige Ameisen aus Itajahy (Brasilien). Mitt. Schweiz. Entomol. Ges. 7: 210-217 (page 216, justified emendation of spelling)
  • Roger, J. 1863a. Die neu aufgeführten Gattungen und Arten meines Formiciden-Verzeichnisses nebst Ergänzung einiger früher gegebenen Beschreibungen. Berl. Entomol. Z. 7: 131-214 (page 213, worker described)
  • Smith, D. R. 1979. Superfamily Formicoidea. Pp. 1323-1467 in: Krombein, K. V., Hurd, P. D., Smith, D. R., Burks, B. D. (eds.) Catalog of Hymenoptera in America north of Mexico. Volume 2. Apocrita (Aculeata). Washington, D.C.: Smithsonian Institution Pr (page 1406, see also)
  • Smith, M. R. 1947f. A generic and subgeneric synopsis of the United States ants, based on the workers. Am. Midl. Nat. 37: 521-647 (page 587, Combination in S. (Trichoscapa))
  • Wesson, L. G. and R. G. Wesson. 1939. Notes on Strumigenys from southern Ohio, with descriptions of six new species. Psyche. 46:91-112.
  • Wilson, E. O. 1954a [1953]. The ecology of some North American dacetine ants. Ann. Entomol. Soc. Am. 46: 479-495 (page 486, see also)