Strumigenys ogloblini

The collector of the type, Dr. A. A. Ogloblin, noted "Nido en la tierra" (nest in ground) on the specimen label.

Identification
The only member of the Strumigenys ogloblini-group.

Distribution based on Regional Taxon Lists
Neotropical Region: Argentina, Brazil, Paraguay.

Nomenclature

 *  ogloblini. Strumigenys (Strumigenys) ogloblini Santschi, 1936d: 409, figs. 15, 16 (w.) ARGENTINA. Brown, 1958f: 136 (q.). See also: Bolton, 2000: 544.

Worker
Brown (1958) - TL about 2.3-2.5 (estimate), HL 0.55-0.56, HW 0.44-0.45 (CI 80-81), ML 0.28-0.29 (MI 51-52), WL about 0.55 mm. (estimate). Readily distinguished by the strongly convex cephalic dorsum, the broad translucent margins along each dorsal scrobe border, and the mandibular form and dentition. There is a single preapical tooth on each mandible (no other preapical or submedian teeth or denticles) at some distance from the apical fork; two principal teeth of fork subequal in length; a single well developed and acute intercalary denticle between them.

Propodeal lamellae each in the form of a short, acute tooth above, below this concave, then broadly convex over the greater part of the length. Petiole with slender, dorsally bicarinate peduncle and small, anteroposteriorly compressed node, subtriangular and bluntly pointed above as seen from the side, but truncate anteriorly as seen from above. Node with broad posterodorsal spongiform collar extended down the sides as thick posterolateral flaps. Ventral spongy band well developed. Postpetiole transverse-elliptical, convex, its surface obscurely punctulate at the sides, becoming smooth and shining in the middle; surrounded by heavy spongiform borders and hung beneath with voluminous spongy masses. Gaster smooth and shining, with short but distinct basal costulae extending 1/5 the length of the basal segment.

Ground pilosity of head and alitrunk consisting of short, curved, subreclinate spatulate or cochlear hairs over most surfaces and extending to scape margins; some of the hairs in the center of the verticocciput are longer and more nearly erect, curved anteriad. Paired long flagelliform hairs—one hair on each lateral occipital border, one on each humerus, and one on each side at the base of the gastric dorsum. One or two pairs of posteriorly curved spatulate hairs on each node. Dorsal surface of gaster with 24-30 or more long, linear-spatulate hairs, curved posteromesad. Legs with short, fine, subreclinate, narrowcochlear pilosity. Short fine pilosity on gula, underside of gaster and surfaces of mandibles. Color ferruginous.

Bolton (2000) - Small species with HL 0.55-0.56, HW 0.44-0.45; CI 80-81 and MI 51-52 (after Brown, 1958e). The characters listed in the diagnosis of the group serve to define the species. In the Neotropical region this is the only species known that has the following characters in combination.

1 Mandible with a single preapical tooth and a single intercalary denticle.

2 Leading edge of scape with hairs present that curve toward base of scape.

3 Upper scrobe margin with hairs that curve posteriorly.

4 Ventral surface of petiole with a thick spongiform curtain.

Queen
Brown (1958) - (One alate and one dealate): TL 2.6-2.7, HL 0.57-0.58, HW 0.46-0.48 (CI 81-83), ML 0.29 (MI 50-51), WL 0.61-0.62, forewing L 2.0 mm. Eye rather modest in size, about 0.10 mm. max. diameter. Mesepisterna smooth and shining for the most part.

Type Material
Bolton (2000) - Syntype workers, ARGENTINA:Misiones, Loreto, No. 2080 (A. Ogloblin) [not seen].

References based on Global Ant Biodiversity Informatics

 * Bolton, B. 2000. The Ant Tribe Dacetini. Memoirs of the American Entomological Institute 65
 * Brandao, C.R.F. 1991. Adendos ao catalogo abreviado das formigas da regiao neotropical (Hymenoptera: Formicidae). Rev. Bras. Entomol. 35: 319-412.
 * Brown W. L. Jr. 1958. The neotropical species of the ant genus Strumigenys Fr. Smith: group of ogloblini Santschi. Journal of the New York Entomological Society 65: 133-137.
 * Cuezzo F. 1999. Nuevas citas de hormigas de las tribus Dacetini y Basicerotini (Hymenoptera: Formicidae) para la República Argentina. Rev. Soc. Entomol. Argent. 58(3/4): 209-210.
 * Cuezzo, F. 1998. Formicidae. Chapter 42 in Morrone J.J., and S. Coscaron (dirs) Biodiversidad de artropodos argentinos: una perspectiva biotaxonomica Ediciones Sur, La Plata. Pages 452-462.
 * Kempf W. W. 1978. A preliminary zoogeographical analysis of a regional ant fauna in Latin America. 114. Studia Entomologica 20: 43-62.
 * Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
 * Kusnezov N. 1978. Hormigas argentinas: clave para su identificación. Miscelánea. Instituto Miguel Lillo 61:1-147 + 28 pl.
 * Kusnezov, N., and R. Golbach. "Lista de las especies argentinas de la tribu Dacetini Hymenoptera, Formicidae." Acta Zoologica Lilloana 10 (1952): 423-426.
 * Leponce, M., L. Theunis, J.H.C. Delabie and Y. Roisin. 2004. Scale dependence of diversity measures in a leaf-litter ant assemblage. Ecography. 27:253-267.
 * Santschi F. 1936. Fourmis nouvelles ou intéressantes de la République Argentine. Revista de Entomologia (Rio de Janeiro). 6: 402-421.
 * Silva T. S. R., and R. M. Feitosa. 2019. Using controlled vocabularies in anatomical terminology: A case study with Strumigenys (Hymenoptera: Formicidae). Arthropod Structure and Development 52: 1-26.
 * Theunis, L., M. Gilbert, Y. Roisin and M. Leponce. 2005. Spatial structure of litter-dwelling ant distribution in a subtropical dry forest. Insectes Sociaux. 52:366377.
 * Vittar, F. 2008. Hormigas (Hymenoptera: Formicidae) de la Mesopotamia Argentina. INSUGEO Miscelania 17(2):447-466
 * Wild, A. L. "A catalogue of the ants of Paraguay (Hymenoptera: Formicidae)." Zootaxa 1622 (2007): 1-55.