Strumigenys auctidens

Specimens of  were collected from secondary forest litter.

Identification
Bolton (2000) - A member of the crassicornis complex in the Strumigenys gundlachi group. Within the entire gundlachi-group the dentition of auctidens is unique and immediately diagnostic. Within the gundlachi group crassicornis-complex, auctidens is closest related to Strumigenys zeteki and Strumigenys stenotes. All three have narrow flattened heads (CI 66-71; maximum depth of head capsule in profile 0.35-0.41 X HL) and a flattened pronotum that is bluntly marginate laterally. For general description of head, body and pilosity see under diagnosis of species-complex and under zeteki.

Distribution based on Regional Taxon Lists
Neotropical Region: Costa Rica, French Guiana.

Nomenclature

 *  auctidens. Pyramica auctidens Bolton, 2000: 179, fig. 130 (w.) FRENCH GUIANA. Combination in Strumigenys: Baroni Urbani & De Andrade, 2007: 116

Worker
HOLOTYPE. TL 1.8, HL 0.52, HW 0.36, CI 69, ML 0.18, MI 35, SL 0.19, SI 53, PW 0.27, AL 0.50. Characters of crassicomis-complex. Proximal to apicodorsal mandibular tooth is a series of 4 - 5 minute denticles. These are followed, close to one-third the distance from apex, by an obviously larger tooth (the submedian, shifted somewhat distally in this species). Proximal to this tooth is a series of 3 - 4 denticles that terminate, at about the basal third, in a second enlarged tooth that is as large as the submedian. Proximal to this tooth the basal third of the margin is edentate. Outer margin of mandible concave through the middle third of its length. Apex of mandible with 4 minute intercalary denticles between apicodorsal and apicoventral teeth. Head strongly dorsoventrally flattened; in profile the maximum vertical distance between highest and lowest point of head capsule is only about 0.35 X HL. Ventral spongiform lobe of postpetiole minute.

PARATYPE. TL 1.7-1.8, HL 0. 50, HW 0.34, CI 68, ML 0.16-0.18, MI 33-36, SL 0.17-0.18, SI 50-53, PW 0.24-0.25, AL 0.46-0.48 (2 measured).

Type Material
Holotype worker, French Guiana: Paracou, xi. 1996 (P.M. Hammond)

Paratypes. 2 workers with same data as holotype (BMNH, ).

References based on Global Ant Biodiversity Informatics

 * Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
 * Fichaux M., B. Bechade, J. Donald, A. Weyna, J. H. C. Delabie, J. Murienne, C. Baraloto, and J. Orivel. 2019. Habitats shape taxonomic and functional composition of Neotropical ant assemblages. Oecologia 189(2): 501-513.
 * Franco W., N. Ladino, J. H. C. Delabie, A. Dejean, J. Orivel, M. Fichaux, S. Groc, M. Leponce, and R. M. Feitosa. 2019. First checklist of the ants (Hymenoptera: Formicidae) of French Guiana. Zootaxa 4674(5): 509-543.
 * Groc S., J. H. C. Delabie, F. Fernandez, F. Petitclerc, B. Corbara, M. Leponce, R. Cereghino, and A. Dejean. 2017. Litter-dwelling ants as bioindicators to gauge the sustainability of small arboreal monocultures embedded in the Amazonian rainforest. Ecological Indicators 82: 43-49.
 * Groc S., J. H. C. Delabie, F. Fernandez, M. Leponce, J. Orivel, R. Silvestre, Heraldo L. Vasconcelos, and A. Dejean. 2013. Leaf-litter ant communities (Hymenoptera: Formicidae) in a pristine Guianese rainforest: stable functional structure versus high species turnover. Myrmecological News 19: 43-51.
 * Groc S., J. Orivel, A. Dejean, J. Martin, M. Etienne, B. Corbara, and J. H. C. Delabie. 2009. Baseline study of the leaf-litter ant fauna in a French Guianese forest. Insect Conservation and Diversity 2: 183-193.
 * Lapolla, J.S., T. Suman, J. Soso-Calvo and T.R. Schultz. 2006. Leaf litter ant diversity in Guyana. Biodiversity and Conservation 16:491510
 * Sosa-Calvo J. 2007. Ants of the leaf litter of two plateaus in Eastern Suriname. In Alonso, L.E. and J.H. Mol (eds.). 2007. A rapid biological assessment of the Lely and Nassau plateaus, Suriname (with additional information on the Brownsberg Plateau). RAP Bulletin of Biological Assessment 43. Conservation International, Arlington, VA, USA.
 * Sosa-Calvo J., T. R. Schultz, and J. S. LaPolla. 2010. A review of the dacetine ants of Guyana (Formicidae: Myrmicinae). Journal of Hymenoptera Research 19: 12-43.