Strumigenys clypeata

Broadly distributed across the southeastern United States. From known specimen records, most taken from litter samples, it prefers moist forest habitat.

Identification
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.

Distribution based on Regional Taxon Lists
Nearctic Region: United States.



Biology
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.

Nomenclature

 *  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.

Worker
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].