Odontomachus coquereli

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Odontomachus coquereli
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ponerinae
Tribe: Ponerini
Genus: Odontomachus
Species: O. coquereli
Binomial name
Odontomachus coquereli
Roger, 1861

Odontomachus coquereli casent0005967 profile 1.jpg

Odontomachus coquereli casent0005967 dorsal 1.jpg

Specimen labels

Synonyms
At a Glance • Ergatoid queen  

 

A Madagascar endemic that forms small colonies of less than 50 workers.

Identification

Keys including this Species

Distribution

Endemic to Madagascar.

Distribution based on Regional Taxon Lists

Malagasy Region: Madagascar (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Fisher and Smith (2008) - Restricted in Madagascar to eastern and northern montane rainforest, lowland rainforest, and littoral forest from 10 to 1325 m. It is most abundant at mid-elevations in the northeast such as in Marojejy National Park. Nests of Odontomachus coquereli are most commonly found in rotten logs and consist of small colonies. Queens of coquereli are wingless and very similar to workers; colonies reproduce by fission. Males are collected in Malaise traps and yellow pan traps. Workers forage on the ground day and night. Solitary foragers have been observed high up on trunks and branches of large trees. It is not clear if they are foraging for plant or insect liquids up in the canopy.

Odontomachus coquereli is the only species in the genus where winged queens have never been found. Molet et al. (2007) investigated the Marojejy population of O. coquereli, and based on demography, morphometry, allometry and ovarian dissections demonstrated that the winged queen caste has been replaced by a wingless reproductive caste and that the strategy of colonial reproduction is fission. A single wingless reproductive (ergatoid) was found in each colony. The smallest colonies consisted of at least 5 workers and the largest colonies never exceeded 40 workers, indicating a threshold size at which a colony divides in two daughter colonies. In contrast, Odontomachus troglodytes reproduces by non-claustral independent foundation and colonies can reach 1300 workers .

Castes

Worker

Male

Nomenclature

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

  • coquereli. Odontomachus coquereli Roger, 1861a: 30 (w.) MADAGASCAR. Fisher & Smith, 2008: 14 (q.m.). Combination in Champsomyrmex: Emery, 1892d: 558. Senior synonym of minor: Brown, 1976a: 103. See also: Forel, 1891b: 105; Brown, 1976a: 143.
  • minor. Champsomyrmex coquereli var. minor Emery, 1899f: 273 (w.q.) MADAGASCAR. Junior synonym of coquereli: Brown, 1976a: 103.

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

Description

Worker

Fisher and Smith (2008) - Measurements: maximum and minimum based on n = 45 from Madagascar: HL 2.69–3.27, HW (across vertex) 1.26–1.77, HW (across upper eye margin) 1.54–2.02, CI 57–67, EL 0.46–0.55, ML 1.76–2.16, MI 61–68, SL 3.04–3.96, SI 164–207, WL 4.18–5.11. FL 3.32–4.68, PW 1.11–1.53.

Workers of this species can be easily distinguished from troglodytes by their larger size, mandible with long, acute apical and preapical teeth and lack of extraocular furrows and temporal ridges on vertex.

There is notable geographic variation in shape of petiole, sculpture and number of preapical teeth. Preapical teeth and denticles range from 7–12. Occasionally, adjacent teeth may be fused at base to form a single bidententate tooth. However, there is no consistent concordant pattern to this variation.

Queen

Fisher and Smith (2008) - Measurements: maximum and minimum based on n = 5 from Madagascar: HL 2.81–2.94, HW (across vertex) 1.39–1.55, HW (across upper eye margin) 1.83–1.98, CI 62–71, EL 0.45–0.55, ML 1.66–1.81, MI 59–62, SL 3.07–3.29, SI 155–179, WL 4.35–4.56, FL 3.60–3.84, PW 1.28–1.43. Preapical teeth count 7–10.

Male

Fisher and Smith (2008) - Measurements: maximum and minimum based on n = 5 from Madagascar: HL 1.11–1.22, HW 1.41–1.57, CI 128–134, EL 0.78–0.90, SL 0.30–0.38, SI 21–23, WL 3.38–3.85, FL 2.90–3.16.

Type Material

Fisher and Smith (2008):

Lectotype: worker, Madagascar (Coquerel) (Berlin Museum für Naturkunde der Humboldt-Universität), present designation [examined] AntWeb CASENT0104549.

Odontomachus coquereli minor. Lectotype; worker, Madagascar, Baie d' Antongil (Mocquerys) (Museo Civico di Storia Naturale, Genoa), present designation [examined] AntWeb CASENT0102021.

References

  • Brown, W. L., Jr. 1976c. Contributions toward a reclassification of the Formicidae. Part VI. Ponerinae, tribe Ponerini, subtribe Odontomachiti. Section A. Introduction, subtribal characters. Genus Odontomachus. Stud. Entomol. 19: 67-171 (page 103, Senior synonym of minor; page 143, see also)
  • Emery, C. 1892f [1891]. Voyage de M. Ch. Alluaud dans le territoire d'Assinie (Afrique occidentale) en juillet et août 1886. Formicides. Ann. Soc. Entomol. Fr. 60: 553-574 (page 558, Combination in Champsomyrmex)
  • Fisher, B. L. and M. A. Smith. 2008. A Revision of Malagasy Species of Anochetus Mayr and Odontomachus Latreille (Hymenoptera: Formicidae). PloS one. 3:e1787.
  • Forel, A. 1891c. Les Formicides. [part]. In: Grandidier, A. Histoire physique, naturelle, et politique de Madagascar. Volume XX. Histoire naturelle des Hyménoptères. Deuxième partie (28e fascicule). Paris: Hachette et Cie, v + 237 pp. (page 105, see also)
  • Roger, J. 1861a. Die Ponera-artigen Ameisen (Schluss). Berl. Entomol. Z. 5: 1-54 (page 30, worker described)