Strumigenys filirrhina

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Strumigenys filirrhina
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Strumigenys
Species: S. filirrhina
Binomial name
Strumigenys filirrhina
(Brown, 1950)

Pyramica filirrhina casent0105848 profile 1.jpg

Pyramica filirrhina casent0105848 dorsal 1.jpg

Specimen labels

Brown (1964) - This species was described from a single worker taken in pine-holly leaf mold in North Carolina. Since then, I have examined a series of workers from Tryon, North Carolina, in leaf mold (L. Eisenach leg.); and a single worker from Champion Springs, Annapolis, Missouri (G. A. Ulrich leg.).


Bolton (2000) - A member of the clypeata group. Only filirrhina and Strumigenys bimarginata of the entire Nearctic fauna have the strongly bimarginate clypeus discussed under the introduction to the group. The described differences in clypeal and cephalic pilosity quickly separate the two.

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




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

  • filirrhina. Smithistruma (Smithistruma) filirrhina Brown, 1950b: 37 (w.) U.S.A. Combination in Pyramica: Bolton, 1999: 1673; in Strumigenys: Baroni Urbani & De Andrade, 2007: 120. See also: Brown, 1953g: 63; Bolton, 2000: 104.

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



Bolton (2000) - TL 2.0-2.2, HL 0.56-0.58, HW 0.38-0.40, CI 67-69, ML 0.08-0.09, MI 16-20, SL 0.27-0.29, SI 69-73, PW 0.24-0.26, AL 0.52-0.55 (3 measured).

Clypeus in full-face view distinctly bimarginate around its entire anterior and lateral borders; the two margins concentric, the outer (lower) margin in this view projects out beyond the inner (upper) margin. In profile the upper and lower margins seen to be separated by a marked concave peripheral groove or gutter. Hairs on anterior and lateral upper clypeal margin fine and filiform. At least the pair closest to the midline curved weakly away from the midline; frequently others or most marginal hairs so oriented. Dorsum of clypeus immediately behind margin with a series of curved hairs that arise from very conspicuous pits. Dorsum of clypeus in profile with a pair of extremely long erect flagellate hairs that arise in front of the antennal socket. Dorsolateral margin of head with 2 (rarely 3) pairs of flagellate hairs; the apicoscrobal hairs freely project laterally but the more anterior hairs seem usually to be more erect. Ground-pilosity of head very fine, in full-face view conspicuously curved toward the midline. A pair of flagellate hairs present on cephalic dorsum close to occipital margin; a pair on dorsum of pronotum and another on mesonotum. Sparse flagellate hairs present on first gastral tergite, especially anteriorly.

Type Material

Bolton (2000) - Holotype worker, U. S. A. North Carolina, Williamston, 17.xii.1946, pine-holly leaf mould (D.L. Wray) (National Museum of Natural History) [examined].