Dorylus gribodoi

Dorylus gribodoi is a West African species of army ants in the genus Dorylus.[2]

Dorylus gribodoi
D. gribodoi worker from the Ivory Coast
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Insecta
Order:
Hymenoptera
Family:
Formicidae
Subfamily:
Dorylinae
Tribe:
Dorylini
Genus:
Dorylus
Species:
D. gribodoi
Binomial name
Dorylus gribodoi
Emery, 1892
Synonyms
  • Dorylus gerstaeckeri Emery, 1895[1]
  • Dorylus lamottei Bernard, 1953[1]

Habitat and distribution

The species occurs in West Africa, from Guinea and Liberia to Cameroon.[3] It is restricted to humid habitats such as rainforest and gallery forest in mixed savanna–forest landscapes and occurs at least up to 1600 m above sea level.[4]

Biology
Frontal view of the head of a D. gribodoi male from Taï, Ivory Coast[5]

Raids are conducted in the leaf-litter stratum. Workers retreat in tunnels when disturbed or exposed to sun. Limited observations indicate that the species seems to prey almost exclusively on earthworms, but this information has to be viewed with caution since variation in prey composition can be considerable in other Dorylus species. Chimpanzees are known to feed on D. gribodoi at two sites (Bossou in Guinea and Taï in Ivory Coast); they either use sticks to "dip" for ant workers at trails or nests or open nests and take brood and workers with their hands.[6] Nests are much less conspicuous than those of driver ant species and extremely difficult to find (for humans; chimpanzees seem to do much better). D. emeryi is broadly sympatric with D. gribodoi and has nearly identical hunting behavior and habitat requirements, such that the two species may be easily confused in the field. The largest workers of D. emeryi are much larger.[4]

Description

The diagnostic features of the D. gribodoi male are its mandible shape (the anterior quarter notably flexed inward) and the nearly flat posterior head margin. In the original description Emery compared D. gribodoi with D. atratus and stated that D. atratus was darker than D. gribodoi and that its scape was longer than half the length of the funiculus. Both Smith (1859) in the original description and later Santschi (1914) mentioned that the posterior head margin of the D. atratus male was convex. While the colouration of D. gribodoi is variable, it is not uniformly black in any of the specimens examined by us and the head shape is nearly rectangular with a flat posterior margin. Workers of D. gribodoi are unique (and easily identifiable) among all Dorylus species in having a nearly round petiole in dorsal view and a distinct ridge on the posterior head margin that is laterally developed into tiny horns in larger specimens. D. gribodoi workers of the same size class can be separated from workers of the D. kohli / D. congolensis complex also by the posterior margin of the head being angular in lateral view and not smoothly rounded.[7]

Larger D. emeryi workers can be separated from D. gribodoi workers of the same size class by the following features: posterior angles of head drawn out backwards and ventrally, petiole in dorsal view angled at widest point, petiole has several conspicuous erect setae on dorsal surface (which are lacking in D. gribodoi), largest workers have massive heads with width ≤ 3.92 mm. The unique petiole shape of D. gribodoi was recognized by Emery in his original description of D. gerstaeckeri (Emery 1895) and also by Bernard (1952) who described D. lamottei based on workers collected at Mount Nimba in Guinea but failed to realize that these specimens were in fact conspecific with Emery’s D. gerstaeckeri. Bernard (1953) also identified males taken from the same location as D. gribodoi, but the association between these males and his D. lamottei workers necessarily remained unknown to him.[8]

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References
  1. Schöning et al. 2008, p. 43
  2. "Species: Dorylus gribodoi". antweb.org. AntWeb. Retrieved 15 October 2013.
  3. Schöning et al. 2008, p. 46
  4. Schöning et al. 2008, pp. 46–47
  5. Schöning et al. 2008, p. 44
  6. Boesch & Boesch 1990, p. 87
  7. Schöning et al. 2008, pp. 47–48
  8. Schöning et al. 2008, p. 48
  • Bernard, F. (1953) La reserve naturelle integrale du Mt Nimba. XI. Hymenopteres, Formicidae. Memoires de l'Institut Francais d'Afrique Noire, 19, 165–270.
  • Boesch, C.; Boesch, H. (1990). "Tool use and tool making in wild chimpanzees". Folia Primatologica. 54 (1–2): 86–99. doi:10.1159/000156428. PMID 2157651.
  • Emery, C. (1895) Die Gattung Dorylus Fab. und die systematische Eintheilung der Formiciden. Zoologische Jahrbücher Abteilung für Systematik Ökologie und Geographie der Tiere, 8, 685–778.
  • Santschi, F. (1914b) Formicides de l'Afrique occidentale et australe du voyage de Mr. le Professeur F. Silvestri. Bollettino del Laboratorio di Zoologia Generale e Agraria della R. Scuola Superiore d'Agricultura, 8, 309–385.
  • Schöning, Caspar; Gottwald, William H.; Kronauer, Daniel J.C.; Vilhelmsen, Lars (2008), "Taxonomy of the African army ant Dorylus gribodoi Emery, 1892 (Hymenoptera, Formicidae) — new insights from DNA sequence data and morphology" (PDF), Zootaxa, 1749: 39–52
  • Smith, F. (1859) Catalogue of Hymenopterous insects in the collections of the British Museum. Part VII. Dorylidae and Thynnidae. British Museum, London. 76 pp.
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