Hypoponera inexorata

Nests and workers are found below ground, sometimes under stones, and nests are often near other ant species. Colony size is less than 20 workers. With its tiny workers, underground nesting habits and small colony size this ant species is not commonly collected. (Navajo Nature, 2010).

Identification
Small ants with minute eyes and a head that is finely punctate and much longer than broad. In viewing the head in full face view, the posterior margin is slightly concave and the mandibles are sinuate along their outer border.

This species is recognized in the United States fauna by its orange color, relatively large size, and sinuate outer border of the mandibles. Confidence with the latter feature requires a little practice, or comparison with species that have convex outer borders to the mandibles. An unidentified southwestern species that resembles H. inexorata in size and color lacks the sinuate mandibles. There is a little variation in size, as in other species of Hypoponera, but this seems to have no geographic basis. Specimens from different regions and habitats, such as the beaches of south Florida and the sandhills of north Florida, seem structurally identical. Presumed males from Florida are distinguished by their large size (length over 3mm), well-pigmented wing veins, and round eyes.

Distribution
Costa Rica and Mexico north through to South Carolina in the east and Arizona in the west. Through much of its range H. inexorata is known from widely scattered localities, perhaps reflecting the difficulty of collecting an ant that is usually subterranean

Distribution based on Regional Taxon Lists
Nearctic Region: United States. Neotropical Region: Costa Rica, Mexico.

Biology
Nests and workers are found below ground, sometimes under stones, and nests are often near other ant species. Colony size is less than 20 workers. With its tiny workers, underground nesting habits and small colony size this ant species is not commonly collected

This species has been found in dry coastal hammocks, Florida scrub and sandhill habitats in Florida. Specimens are found under objects or in sand, or occasionally extracted from leaf litter in dry habitats. Complete colony are yet to be found. Ergatoid males have not been seen and neither have large-eyed females without wings or wing stubs. Alates have been collected in Florida in June and July.

Mississippi
Joe MacGown, Ants (Formicidae) of the southeastern United States: This species has recently been collected in Black Belt Prairie remnants in MS. Colonies have been found underneath the soil by random digging. At least one colony has been found underneath an imported fire ant colony (Pers. Comm. JoVonn G. Hill).

Texas
Wheeler (1903) reported: I have found it only on dry hill-slopes under rather small stones (limestone in central Texas, volcanic rock in the Trans-Pecos).

Nomenclature

 *  inexorata. Ponera inexorata Wheeler, W.M. 1903b: 94, fig. 2 (w.q.) U.S.A. Combination in Hypoponera: Taylor, 1968a: 65. Current subspecies: nominal plus fallax.

Worker
Length: 2.75-3.25 mm. Mandibles long and flattened, with concavely sinuate lateral borders and about a dozen teeth, which are small and indistinct toward the base, but longer and more pointed toward the tips of the blade. Head distinctly longer than broad with concave occipital margin and subparallel sides. Clypeus broadly rounded in front, convex in the middle. Antennae rather slender, scape reaching to the posterior angle of the head, joints 2-5 of the funiculus fully as long as broad, the remaining joints longer than broad. Eyes very small, with at most 3-4 ommatidia in their longest diameter and situated about one-fourth the distance from the anterior to the posterior border of the head. Thorax with very distinct pro-mesonotal and mesoepinotal sutures; pronotum broader then the succeeding thoracic segments, rounded, with rather sloping anterior angles; mesonotum convex; epinotum laterally compressed, its basal portion in profile horizontal and nearly straight, its declivity flattened, with rounded sides, not carinate. Petiole decidedly narrower than the first gastric segment, its anterior surface flattened dorsoventrally but distinctly convex from side to side; posterior surface flat in both directions, so that the segment when seen from above is somewhat semicircular; seen from behind the border of the node is nearly circular in outline. Gaster of the usual form. Legs moderately stout, each tibia with a pair of spurs, one of which is pectinated.

Surface of the body, especially the dorsal surface of the head, thorax, and petiole, shining. Mandibles with coarse, scattered, piligerous punctures. Head covered rather densely but not confluently with coarse piligerous punctures or small foveolae. Pronotum with similar but smaller and sparser punctures; neck and mesonotum finely corrugated above; meso- and metapleura similarly but more coarsely sculptured, subopaque. Petiole and gaster covered with piligerous punctures like those on the pronotum.

Whole body clothed with pale yellow, reclinate or appressed hairs, among which there are longer, more scattered, suberect hairs, especially on the thorax and abdomen.

Yellowish ferruginous throughout, mandibles, antennae, and legs somewhat paler. Epinotum, mesopleurae, and posterior gastric segments sometimes more reddish or brownish. Teeth of mandibles and anterior border of clypeus blackish.

Queen
Dealated. Length: 3.25 mm. Very much like the worker in form and coloration. Each ocellus with a small black spot at its margin. Head distinctly more opaque than in the worker, owing to a denser aggregation of the piligerous foveolae; the node is thinner antero-posteriorly and its anterior surface is very flat or evenly slightly concave from side to side. Alar insertions black.

Type Material
Described from two females and numerous workers, taken at Austin, San Angelo, and Fort Davis (Texas).

References based on Global Ant Biodiversity Informatics

 * Atchison R. A., J. Hulcr, and A. Lucky. 2018. Managed fire frequency significantly influences the litter arthropod community in longleaf pine flatwoods. Environmental Entomology 20(10): 1-11.
 * Castano-Meneses, G., M. Vasquez-Bolanos, J. L. Navarrete-Heredia, G. A. Quiroz-Rocha, and I. Alcala-Martinez. 2015. Avances de Formicidae de Mexico. Universidad Nacional Autonoma de Mexico.
 * Cokendolpher J. C., and O. F. Francke. 1990. The ants (Hymenoptera, Formicidae) of western Texas. Part II. Subfamilies Ecitoninae, Ponerinae, Pseudomyrmecinae, Dolichoderinae, and Formicinae. Special Publications, the Museum. Texas Tech University 30:1-76.
 * Cokendolpher J.C., Reddell J.R., Taylor S.J, Krejca J.K., Suarez A.V. and Pekins C.E. 2009. Further ants (Hymenoptera: Formicidae) from caves of Texas [Hormigas (Hymenoptera: Formicdae) adicionales de cuevas de Texas]. Texas Memorial Museum Speleological Monographs, 7. Studies on the cave and endogean fauna of North America, V. Pp. 151-168
 * Cover S. P., and R. A. Johnson. 20011. Checklist of Arizona Ants. Downloaded on January 7th at http://www.asu.edu/clas/sirgtools/AZants-2011%20updatev2.pdf
 * Dash S. T. 2011. A taxonomic revision of the New World Hypoponera Santschi, 1938 (Hymenoptera: Formicidae). PhD Thesis University of Texas at El Paso, 296 pages.
 * Dattilo W. et al. 2019. MEXICO ANTS: incidence and abundance along the Nearctic-Neotropical interface. Ecology https://doi.org/10.1002/ecy.2944
 * Deyrup, M. and J. Trager. 1986. Ants of the Archbold Biological Station, Highlands County, Florida (Hymenoptera: Formicidae). Florida Entomologist 69(1):206-228
 * Deyrup, Mark A., Carlin, Norman, Trager, James and Umphrey, Gary. 1988. A Review of the Ants of the Florida Keys. The Florida Entomologist. 71(2):163-176.
 * Fernández F., and T. M. Arias-Penna. 2008. Las hormigas cazadoras en la región Neotropical. Pp. 3-39 in: Jiménez, E.; Fernández, F.; Arias, T.M.; Lozano-Zambrano, F. H. (eds.) 2008. Sistemática, biogeografía y conservación de las hormigas cazadoras de Colombia. Bogotá: Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, xiv + 609 pp.
 * Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
 * Graham, J.H., A.J. Krzysik, D.A. Kovacic, J.J. Duda, D.C. Freeman, J.M. Emlen, J.C. Zak, W.R. Long, M.P. Wallace, C. Chamberlin-Graham, J.P. Nutter and H.E. Balbach. 2008. Ant Community Composition across a Gradient of Disturbed Military Landscapes at Fort Benning, Georgia. Southeastern Naturalist 7(3):429-448
 * Hess C. G. 1958. The ants of Dallas County, Texas, and their nesting sites; with particular reference to soil texture as an ecological factor. Field and Laboratory 26: 3-72.
 * Hill J.G. & Brown R. L. 2010. The Ant (Hymenoptera: Formicidae) Fauna of Black Belt Prairie Remnants in Alabama and Mississippi. Southeastern Naturalist. 9: 73-84
 * Johnson R. Personnal Database. Accessed on February 5th 2014 at http://www.asu.edu/clas/sirgtools/resources.htm
 * Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
 * Longino J. et al. ADMAC project. Accessed on March 24th 2017 at https://sites.google.com/site/admacsite/
 * Longino, J.T. 2010. Personal Communication. Longino Collection Database
 * MacGown J. A., J. G. Hill, R. L. Brown, T. L. Schiefer, J. G. Lewis. 2012. Ant diversity at Noxubee National Wildlife Refuge in Oktibbeha, Noxubee, and Winston Counties, Mississippi. Mississippi Agricultural and Forestry Experiment Station Bulletin 1197: 1-30
 * MacGown, J.A., J.G. Hill, R.L. Brown and T.L. 2009. Ant Diversity at Noxubee National Wildlife Refuge in Oktibbeha, Noxubee, and Winston Counties, Mississippi Report #2009-01. Schiefer. 2009.
 * Macgown J. A., S. Y. Wang, J. G. Hill, and R. J. Whitehouse. 2017. A List of Ants (Hymenoptera: Formicidae) Collected During the 2017 William H. Cross Expedition to the Ouachita Mountains of Arkansas with New State Records. Transactions of the American Entomological Society, 143(4): 735-740.
 * Maes, J.-M. and W.P. MacKay. 1993. Catalogo de las hormigas (Hymenoptera: Formicidae) de Nicaragua. Revista Nicaraguense de Entomologia 23.
 * Menozzi C. 1931. Contribuzione alla conoscenza del microgenton di Costa Rica. III. Hymenoptera - Formicidae. Bollettino del Laboratorio di Zoologia Generale e Agraria della Reale Scuola Superiore d'Agricoltura. Portici. 25: 259-274.
 * Mirmecofauna de la reserva ecologica de San Felipe Bacalar
 * Moreau C. S., M. A. Deyrup, and L. R. David Jr. 2014. Ants of the Florida Keys: Species Accounts, Biogeography, and Conservation (Hymenoptera: Formicidae). J. Insect Sci. 14(295): DOI: 10.1093/jisesa/ieu157
 * O'Keefe S. T., J. L. Cook, T. Dudek, D. F. Wunneburger, M. D. Guzman, R. N. Coulson, and S. B. Vinson. 2000. The Distribution of Texas Ants. The Southwestern Entomologist 22: 1-92.
 * Reddell J. R., and J. C. Cokendolpher. 2001. Ants (Hymenoptera: Formicidae) from caves of Belize, Mexico, and California and Texas (U.S.A.) Texas. Texas Memorial Museum Speleological Monographs 5: 129-154.
 * Smith M. R. 1927. An additional annotated list of ants of Mississippi, with a description of a new species of Pheidole (Hym.: Formicidae). Entomological News 38: 308-314.
 * Smith M. R. 1936. A list of the ants of Texas. Journal of the New York Entomological Society 44: 155-170.
 * Smith M. R. 1936. Ants of the genus Ponera in America, north of Mexico. Annals of the Entomological Society of America 29: 420-430.
 * Vasquez-Bolanos M. 2011. Checklist of the ants (Hymenoptera: Formicidae) from Mexico. Dugesiana 18(1): 95-133.
 * Vásquez-Bolaños M. 2011. Lista de especies de hormigas (Hymenoptera: Formicidae) para México. Dugesiana 18: 95-133
 * Wheeler W. M. 1903. A decad of Texan Formicidae. Psyche (Cambridge). 10: 93-111.
 * Wheeler W. M. 1908. The ants of Texas, New Mexico and Arizona. (Part I.). Bulletin of the American Museum of Natural History 24: 399-485.
 * Wheeler, G.C. and J. Wheeler. 1985. A checklist of Texas ants. Prairie Naturalist 17:49-64.
 * Zettler J. A., M. D. Taylor, C. R. Allen, and T. P. Spira. 2004. Consequences of Forest Clear-Cuts for Native and Nonindigenous Ants (Hymenoptera: Formicidae). Ann. Entomol. Soc. Am. 97(3): 513-518.