Acanthostichus laticornis

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Acanthostichus laticornis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Dorylinae
Genus: Acanthostichus
Species: A. laticornis
Binomial name
Acanthostichus laticornis
Forel, 1908

Acanthostichus laticornis casent0281970 p 1 high.jpg

Acanthostichus laticornis casent0281970 d 1 high.jpg

Specimen Labels

Synonyms

Mackay (1996) - One nest found under large rock, numerous workers, single female, apparently in a termite nest. A staphylinid (Aleocharinae: Paradoxenusa silvestrii Bruch) occurs with this species (Bruch, 1937). These ants forage in columns similar to Eciton, but smaller; they prey on termites (Kusnezov, 1962).

Identification

A member of the serratulus species complex. Mackay (1996) - The worker is similar to that of Acanthostichus kirbyi, but is easily distinguished by the short, thick scapes with a well formed angle (Fig. 4). The female is very similar to that of Acanthostichus quadratus, but differs in that the anterior surface of the scape is angulate and the female of this species possesses a well developed malar groove. The male is almost indistinguishable from that of A. laticornis. It differs primarily in that the sculpture of the propodeum is rougher.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina, Brazil, Paraguay (type locality), Uruguay.

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Biology

Castes

Nomenclature

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

  • laticornis. Acanthostichus laticornis Forel, 1908c: 345 (w.) PARAGUAY. Santschi, 1933e: 106 (m.); Mackay, 1996: 158 (q.). Senior synonym of obscuridens: Kusnezov, 1962a: 131.
  • obscuridens. Acanthostichus laticornis var. obscuridens Santschi, 1934c: 23 (w.) ARGENTINA. Bruch, 1934a: 4 (q.m.). Junior synonym of laticornis: Kusnezov, 1962a: 131.

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

Description

Worker

Mackay 1996. Figures 1-10.
Mackay 1996. Figures 11-33.

Mackay (1996) - HL 1.01-1.31, HW 0.86-1.20, SL 0.50-0.66, SW 0.23-0.29, FL 0.70-0.95, FW 0.24-0.35, WL 1.28-1.73, PW 0.38-0.53, PL 0.46-0.65, SI 49-50, CI 85-91, PI 123-124, FI 271-295, SL/SW 2.22-2.30.

Mandibles without teeth. but with slight undulations. lateral clypeal teeth well developed; scape relatively short and thick. with well developed angle (Fig. 4); vertex concave; petiole somewhat elongate. subpetiolar process rounded anteriorly with sharp ventral apex posteriorly (Fig. 27); femur not thickened.

Queen

Mackay (1996) - HL 1.64, HW 1.82, SL 0.73, SW 0.34, EL 0.20, WL 2.20, PW 1.60, PL 0.81, SI 45, CI 111, PI 51, SL/SW 2.15.

Mandibles without teeth; lateral clypeal angles well formed; malar groove well developed. but extending only ½ distance to eye; outer margin of scape angulate as in worker; femora not incrassate; petiole much wider than long, wider at posterior end. Entire ant covered with scarce, flexuous hairs, concolorous light brown.

Male

Mackay (1996) - HL 0.74-0.95, HW (posterior to eye) 0.66-0.96, SL 0.20-0.28, EL 0.39-0.48, WL 1.66-1.68, PW 0.36-0.39, PL 0.45-0.51, SI 27-29, CI 90-101, PI 124-132.

The male is similar to those of other species in the genus and is difficult to separate. Apparently the shape of the volsellae, shape of the petiole and sculpturing of the propodeum will separate this species from some of the other species (see key). The scape is slightly thickened, but bears no resemblance to the characteristic shape of the scape of the worker.

Type Material

Mackay (1996) - Worker. PARAGUAY: San Bernardino 15 cotype workers (12 worker cotypes, Musee d'Histoire Naturelle Genève, 1 worker cotype, Naturhistorisches Museum Basel, 2 workers, possibly cotypes, Museo Argentino de Ciencias Naturales) [all seen]. Acanthostichus laticornis, lectotype worker (here designated) (MHNG) and eleven paralectotype workers (MHNG), 1 paralectotype worker (NHMB), PARAGUAY. San Bernardino (Fiebig); A. laticornis Forel worker type Formic #5944., oll. Forel [all seen]. Two possible cotype workers in MACN. Acanthostichus laticornis var. obscuridens, ARGENTINA. Misiones. Estacion Experimental Loreto. Dr. A. A. Oglobin, 24-viii-1933, female, lectotype worker (here designated) (NHMB) and 4 paralectotype workers (NHMB) [seen], five paralectotype workers (Museu de Zoologia da Universidade de Sao Paulo) [seen].

References

  • Bruch, C. 1934a. La hembra dictadiforme de Acanthostichus laticornis For. v. obscuridens Sants. (Hymenoptera Formicidae). Rev. Soc. Entomol. Argent. 6: 3-8 PDF
  • Forel, A. 1908h. Ameisen aus Sao Paulo (Brasilien), Paraguay etc. gesammelt von Prof. Herm. v. Ihering, Dr. Lutz, Dr. Fiebrig, etc. Verh. K-K. Zool.-Bot. Ges. Wien 58: 340-418 (page 345, worker described)
  • Kusnezov, N. 1962a. El género Acanthostichus Mayr (Hymenoptera, Formicidae). Acta Zool. Lilloana 18: 121-138 (page 131, senior synonym of obscuridens)
  • MacKay, W. P. 1996. A revision of the ant genus Acanthostichus (Hymenoptera: Formicidae). Sociobiology 27: 129-179 (page 158, queen described)
  • Santschi, F. 1933f. Fourmis de la République Argentine en particulier du territoire de Misiones. An. Soc. Cient. Argent. 116: 105-124 (page 106, male described)