Camponotus hagensii

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Camponotus hagensii
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Camponotus
Subgenus: Myrmosaga
Species: C. hagensii
Binomial name
Camponotus hagensii
Forel, 1886

Camponotus hagensii casent0101492 profile 1.jpg

Camponotus hagensii casent0101492 dorsal 1.jpg

Specimen labels

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. 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

Rakotonirina and Fisher (2022) - 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.

Keys including this Species

Distribution

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

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.
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Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.
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Biology

Castes

Worker

Images from AntWeb

Camponotus hagensii casent0101494 head 1.jpgCamponotus hagensii casent0101494 profile 1.jpgCamponotus hagensii casent0101494 dorsal 1.jpgCamponotus hagensii casent0101494 label 1.jpg
Paralectotype of Camponotus hagensii. Worker (major/soldier). Specimen code casent0101494. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by MNHN, Paris, France.
Camponotus hagensii casent0104632 head 1.jpgCamponotus hagensii casent0104632 profile 1.jpgCamponotus hagensii casent0104632 dorsal 1.jpgCamponotus hagensii casent0104632 label 1.jpg
Paralectotype of Camponotus hagensii. Worker (major/soldier). Specimen code casent0104632. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by ZMHB, Berlin, Germany.

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • hagensii. Camponotus rubripes r. hagensii Forel, 1886f: 158 (s.w.) MADAGASCAR.
    • Type-material: lectotype minor worker (by designation of Rakotonirina & Fisher, 2022: 94), 3 paralectotype major workers, 2 paralectotype minor workers.
    • Type-locality: lectotype Madagascar: “Centre de Madagascar” (no further data) (J.M. Hildebrandt); paralectotypes with same data.
    • Type-depositories: MHNG (lectotype); MHNG, MNHN, MNHU (paralectotypes).
    • Forel, 1895c: 244 (q.m.).
    • Combination in C. (Myrmoturba): Forel, 1914a: 267;
    • combination in C. (Tanaemyrmex): Emery, 1925b: 92;
    • combination in C. (Myrmosaga): Rakotonirina & Fisher, 2022: 94.
    • 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; Rakotonirina & Fisher, 2022: 94 (redescription).
    • Distribution: Madagascar.

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

Description

Rakotonirina and Fisher (2022):

Morphological measurements: see Appendix 1 and Ratios of morphometric data for majors and minors

Minor In full-face view, head sides diverging towards broadly convex posterior margin or parallel anterior to eye level and rounding evenly to posterior border; eye protruding and large (EL/CS: 0.30±0.01; 0.28–0.33), breaking lateral cephalic margin; level of its posterior margin located ca. at posterior 1/4 of head (PoOc/CL: 0.25±0.01; 0.23–0.25); frontal carinae wide (FR/CS: 0.34±0.01; 0.31–0.35), posteriorly diverging, distance between them larger than their smallest distance to eye; clypeus without well-defined anterolateral corner, anteromedian margin approximately truncate; mandible with two apical teeth distantly spaced; antennal scape relatively long (SL/CS: 1.24±0.06; 1.09–1.36). Promesonotum weakly convex, mesonotum with posterior portion flat immediately anterior to weakly visible metanotal groove; propodeal dorsum almost straight, its junction to declivity bluntly angulate; height of propodeal declivity 3/4 length of dorsum. Petiolar node short and high; its dorsal margin inclined posteriorly, rounding to anterior margin; height of anterior face 2/3 that of posterior; femur of hind leg rounded axially, not twisted basally.

First and second gastral tergites without a pair of white spots; erect hairs on lateral margin of head lacking; more than six erect hairs present near posterior margin of head; antennal scape covered only with suberect hairs inclined at ca. 30° and appressed hairs; pronotum with few erect hairs, mesonotum bearing a pair of erect hairs; posterodorsal corner of propodeum with two pairs of erect hairs. Head, antenna, and gaster dark brown or reddish brown; mesosoma, petiolar node, and legs yellow to orange-yellow.

Major Differing from minor worker in having larger, heart-shaped head (CS: 2.37±0.26; 2.00–2.70; CWb/CL: 0.97±0.05; 0.92–1.04) with broadly concave posterior margin, anteromedian margin of clypeus slightly excised medially; apical 1/4 of antennal scape extending beyond posterior cephalic margin; robust mesosoma with distinct metanotum; propodeal dorsum convex immediately behind metanotum, < 2 × the height of declivity surface; petiolar node much higher than long and tapering dorsally.

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

  • Dalla Torre, K. W. von. 1893. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. Vol. 7. Formicidae (Heterogyna). Leipzig: W. Engelmann, 289 pp. (page 233, Raised to species)
  • Emery, C. 1920d. Studi sui Camponotus. Bull. Soc. Entomol. Ital. 52: 3-48 (page 6, Raised to species)
  • Emery, C. 1925d. Hymenoptera. Fam. Formicidae. Subfam. Formicinae. Genera Insectorum 183: 1-302 (page 92, Combination in C. (Tanaemyrmex))
  • Emery, C. 1925d. Hymenoptera. Fam. Formicidae. Subfam. Formicinae. Genera Insectorum 183: 1-302 (page 92, Raised to species)
  • Forel, A. 1886h. Études myrmécologiques en 1886. Ann. Soc. Entomol. Belg. 30: 131-215 (page 158, soldier, worker described)
  • 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 27, Race of maculatus)
  • Forel, A. 1895d. Nouvelles fourmis de l'Imerina oriental (Moramanga etc.). Ann. Soc. Entomol. Belg. 39: 243-251 (page 244, queen, male described)
  • Forel, A. 1914a. Le genre Camponotus Mayr et les genres voisins. Rev. Suisse Zool. 22: 257-276 (page 267, Combination in C. (Myrmoturba))
  • Forel, A. 1914a. Le genre Camponotus Mayr et les genres voisins. Rev. Suisse Zool. 22: 257-276 (page 267, Raised to species)
  • Rakotonirina, J.C., Fisher, B.L. 2022. Revision of the Malagasy Camponotus subgenus Myrmosaga (Hymenoptera, Formicidae) using qualitative and quantitative morphology. ZooKeys 1098: 1–180 (doi:10.3897/zookeys.1098.73223).
  • Santschi, F. 1922d. Camponotus néotropiques. Ann. Soc. Entomol. Belg. 62: 97-124 (page 101, Race of fumidus)
  • Wheeler, W. M. 1922k. Ants of the American Museum Congo expedition. A contribution to the myrmecology of Africa. IX. A synonymic list of the ants of the Malagasy region. Bull. Am. Mus. Nat. Hist. 4 45: 1005-1055 (page 1039, Raised to species)

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.
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