Camponotus hagensii

Camponotus hagensii is known mostly from montane rainforest, montane ericoid thicket, philipia forest, montane shrubland, and savannah grassland of the high plateau ranging from the PN Marojejy in the north to the Anosyenne Mountains in the south of Madagascar (Fig. 56D). The species has been found nesting in the ground, in root mat layers on the ground, and in rotting tree stumps. Workers have been found foraging frequently on the ground and leaf litter, rarely on low vegetation. (Rakotonirina & Fisher, 2022)

Identification
In full-face view, lateral margin of head anterior to eye level diverging posteriorly and covered with erect hairs; anterior clypeal margin truncate; mesosoma in proﬁle low and long; gastral tergites without abundant pubescence; head and gaster black, mesosoma reddish orange to brown.

Camponotus hagensii is similar to [[Camponotus aurosus] with respect to the bicolored body and the presence of erect hairs on the lateral margin of the head anterior to eye level, but in C. aurosus the anterior clypeal margin is broadly triangular, the mesosoma is short and high in proﬁle, and the gastral tergites are covered with abundant pubescence.

Distribution based on Regional Taxon Lists
Malagasy Region: Madagascar.

Nomenclature

 * . Camponotus rubripes r. hagensii Forel, 1886f: 158 (s.w.) MADAGASCAR.
 * Forel, 1895c: 244 (q.m.).
 * Combination in C. (Myrmoturba): Forel, 1914a: 267;
 * combination in C. (Tanaemyrmex): Emery, 1925b: 92.
 * Subspecies of maculatus: Forel, 1891b: 27 (redescription); Emery, in Dalla Torre, 1893: 233, 241 (footnote); Emery, 1896d: 370 (in list).
 * Subspecies of fumidus: Santschi, 1922c: 101.
 * Status as species: Dalla Torre, 1893: 233; Forel, 1895c: 244; Forel, 1914a: 267; Emery, 1920c: 6, 9 (in key); Wheeler, W.M. 1922a: 1039; Emery, 1925b: 92; Bolton, 1995b: 102.

Type Material

 * Lectotype minor worker, by present designation, Centre de Madagascar (Hildebrandt) AntWeb CASENT0910112 (MHNG) [Rakotonirina & Fisher, 2022].
 * Paralectotypes: 2 minor workers and 3 major workers of same data as lectotype but respectively specimen coded as: FOCOL2423, FOCOL2424 (ZMHB), and CASENT0910111 (MHNG), CASENT0104632 and FOCOL2422 (ZMHB), CASENT0101494 (MNHN) [Rakotonirina & Fisher, 2022].

References based on Global Ant Biodiversity Informatics

 * Fisher B. L. 1997. Biogeography and ecology of the ant fauna of Madagascar (Hymenoptera: Formicidae). Journal of Natural History 31: 269-302.
 * Fisher B. L. 2003. Formicidae, ants. Pp. 811-819 in: Goodman, S. M.; Benstead, J. P. (eds.) 2003. The natural history of Madagascar. Chicago: University of Chicago Press, xxi + 1709 pp.
 * Forel A. 1886. Études myrmécologiques en 1886.. Annales de la Société Entomologique de Belgique. 30: 131-215.