Camponotus consobrinus

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Camponotus consobrinus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Camponotini
Genus: Camponotus
Species: C. consobrinus
Binomial name
Camponotus consobrinus
(Erichson, 1842)

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Camponotus consobrinus casent0217633 d 1 high.jpg

Specimen Labels

Synonyms

A ground nesting species that recruits via tandem running. Alate specimens at SAMA indicate that nuptial flights occurred near Adelaide on 20 January 1991 and 21 January 1992.

Photo Gallery

  • Tending a scale insect on a Eucalyptus trunk.
  • Returning to the nest with prey.
  • The enlarged gaster of this worker is the result of collecting honeydew while foraging on trees.
  • Workers tandem running to a food source in a large Eucalyptus approximately 15m from their nest.
  • These ants are ground nesting, often forming large mounds of loose soil around the entrance. Here, a queen ventures outside the nest, preparing for her nuptial flight.

Identification

A member of the Camponotus nigriceps species group. McArthur and Adams (1996) - Distinctly polymorphic. Maximum frequency of head widths in minor workers occurs at about 1.75 mm, in medium workers at about 2.8 mm and in major workers at about 3.25 mm. The relationship between log HW and Jog HL is practically linear. Major workers, whose role is to defend the nest, have developed large muscles attached to their mandibles. Thus, major workers possess disproportionately wide heads (Huxley 1936). Some populations of dark coloured C. consobrinus possess suberect pubescence on tibiae.

C. consobrinus, Camponotus loweryi and Camponotus longideclivis always lack setae on the gula and they may be distinguished as follows. C. loweryi major workers (maximum HW = 4·3 mm) are larger than C. consobrinus (maximum HW = 3·6 mm) and C. longideclivis (maximum HW = 3·7 mrn). Gaster colour in C. loweryi shows little variation from posterior to anterior whereas C. consobrinus is distinctly bicoloured. In Mallee areas, C. consobrinus, C. loweryi, Camponotus clarior and Camponotus nigriceps are sympatric. In the Blue Mountains of New South Wales, C. consobrinus and Camponotus pallidiceps are sympatric. In the north-east of New South Wales C. consobrinus and Camponotus eastwoodi are sympatric.

Keys including this Species

Distribution

McArthur and Adams (1996) - The known distribution is confined to south-eastern and eastern Australia. There is a single pinned specimen of C. consobrinus in ANIC labelled 'Perth. John Clark'. We await other finds before including it in our distribution map of this species.

Distribution based on Regional Taxon Lists

Australasian Region: Australia (type locality).


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Worker

Nomenclature

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

  • consobrinus. Formica consobrina Erichson, 1842: 258 (q.) AUSTRALIA. Smith, F. 1858b: 41 (w.); Imai, Crozier & Taylor, 1977: 346 (k.). Combination in Camponotus: Roger, 1863b: 4; in C. (Tanaemyrmex): Wheeler, W.M. 1933b: 22. Senior synonym of dimidiatus: Wheeler, W.M. 1933b: 23; Clark, 1934c: 70; of obniger: McArthur & Adams, 1996: 22.
  • dimidiatus. Camponotus dimidiatus Roger, 1863b: 4 (w.) AUSTRALIA. Combination in C. (Myrmoturba): Forel, 1913g: 181; in C. (Tanaemyrmex): Emery, 1925b: 103. Junior synonym of nigriceps: Mayr, 1876: 63. Revived from synonymy as subspecies of nigriceps: Emery, 1887a: 211; Stitz, 1911a: 372; Forel, 1915b: 97; Crawley, 1922c: 35. Junior synonym of consobrinus: Wheeler, W.M. 1933b: 23; Clark, 1934c: 70.
  • obniger. Camponotus nigriceps r. obniger Forel, 1902h: 506 (s.w.) AUSTRALIA. Forel, 1910b: 72 (q.). Combination in C. (Tanaemyrmex): Emery, 1925b: 103. Subspecies of consobrinus: Wheeler, W.M. 1933b: 23; Clark, 1934c: 71; of nigriceps: Taylor & Brown, D.R. 1985: 117. Junior synonym of consobrinus: McArthur & Adams, 1996: 22.

Type Material

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

Description

Black,shining head dark sides of the thorax and legs ferruginous.

Female. Length 6 lines (12.5 mm). Close to C herculaneus. Antennae scape black. Head is just wider than thorax. Black,opaque above, sparingly punctated obsoletely, finely grooved between the median ridges, two carinae between the antennae, carinae slightly bow shaped. Mandibles and palps black. Thorax oblong, somewhat compressed, smooth dorsal part of the notum with scattered punctures. Node subovate, front and back flat, ferruginous. Gaster with sparse and fine punctations, pilosity scarce. Black and shining, forepart is ferruginous. Wings are dark, stigmata and nerves are yellow. Differs from C.herculaneus by the less upright stature, dark head black border, thorax longer, dorsal metathorax black, gaster scarcely punctated, feet completely reddish.

McArthur and Adams (1996) - Colour: head black to red brown; mesosoma, node black to yellow including orange; anterior gaster lighter than posterior, posterior gaster usuall near colour of head. Pilosity always absent on gula; setae erect slightly forward pointing. 0.3-0.5 mm long on mesosoma dorsum, 3-10 on propodeum (Fig. 15 a, b), 5-20 on mesonotum, 15-30 on pronotum, plentiful on gaster pointing backward; on head and mandibles more erect and shorter, not plentiful. Short setae on scapes raised to an inclination of up to 20° when viewed from front. Short setae on midtibiae: inclination 5-40°. Pubescence(= short setae, length always < 0.2 mm) on head and mesosoma adpressed, spacing > setae length. Integument: glossy finely reticulate, front of head with shallow sparse punctation. Node summit viewed from the rear: straight or convex (Fig. 12b), occasionally slightly concave in largest majors.

HW = 1.30-3.30 mm; HL = 1.75-3.40 mm; n = 261. TL = 2.95-3.00 mm; n = 49. TL = 1.9 + 1.87 log HW (n = 49, r = 0.93, s.e.(y). = 0.07, s.e.(x)., = 0.07). PD:D = 1.3 in major workers increasing to 3.0 in minor workers.

Karyotype

  • n = 23, 2n = 46 (Australia) (Imai et al., 1977).

Etymology

McArthur and Adams (1996) - Consobrina (Latin: cousin). Erichson (1842) recognised some similarity of this species to Formica herculaneus.

References

  • Clark, J. 1934c. Ants from the Otway Ranges. Mem. Natl. Mus. Vic. 8: 48-73 (page 70, senior synonym of dimidiatus)
  • Erichson, W. F. 1842. Beitrag zur Insecten-Fauna von Vandiemensland, mit besonderer Berücksichtigung der geographischen Verbreitung der Insecten. Arch. Naturgesch. 8 (1): 83-287 (page 258, queen described)
  • Imai, H. T.; Crozier, R. H.; Taylor, R. W. 1977. Karyotype evolution in Australian ants. Chromosoma (Berl.) 59: 341-393 (page 346, karyotype described)
  • McArthur, A. J. and M. Adams. 1996. A morphological and molecular revision of the Camponotus nigriceps group (Hymenoptera: Formicidae) from Australia. Invertebrate Taxonomy. 10:1-46. (page 22, Senior synonym of obniger)
  • Roger, J. 1863b. Verzeichniss der Formiciden-Gattungen und Arten. Berl. Entomol. Z. 7(B Beilage: 1-65 (page 4, combination in Camponotus)
  • Smith, F. 1858a. Catalogue of hymenopterous insects in the collection of the British Museum. Part VI. Formicidae. London: British Museum, 216 pp. (page 41, worker described)
  • Wheeler, W. M. 1933b. Mermis parasitism in some Australian and Mexican ants. Psyche (Camb.) 40: 20-31 (page 22, combination in C. (Tanaemyrmex); page 23, senior synonym of dimidiatus)