Monomorium carbo

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Monomorium carbo
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Solenopsidini
Genus: Monomorium
Species: M. carbo
Binomial name
Monomorium carbo
Forel, 1910

Monomorium carbo casent0249908 p 1 high.jpg

Monomorium carbo casent0249908 d 1 high.jpg

Specimen Labels

Only known from a single collection of a few workers.

Identification

Bolton (1987):

Worker. TL 2.3-2.4, HL 0.60-0.63, HW 0.43-0.45, CI 71-72, SL 0.44-0.48, SI 102-107, PW 0.30-0.31, AL 0.66-0.70 (2 measured).

Anterior margin of median portion of clypeus shallowly concave. With head in full-face view the sides weakly divergent from back to front, the occipital margin shallowly concave. Maximum diameter of eye 0-24-0-26 x HW and with 7 ommatidia in the longest row. The eyes very slightly in front of the midlength of the sides. Metanotal groove scarcely impressed in profile, the propodeal dorsum flattened to weakly depressed medially, without sharp lateral margins. Occipital margin of head with a pair of hairs straddling the midline and another pair closer to the occipital corners. Dorsal alitrunk without hairs. Petiole and postpetiole each with 1-2 pairs of backward directed hairs. First gastral tergite with numerous hairs which are evenly distributed over the surface in front of the apical transverse row. Dorsum of head opaque, shagreenate-punctulate everywhere. Dorsal alitrunk finely reticulate-punctate, the sides similarly sculptured but somewhat effaced on the sides of the pronotum. First gastral tergite shining, with superficial reticular patterning only. Colour uniform dark brown to blackish brown. This enigmatic Ethiopian species is only known from the type-series of a couple of workers.

At first glance it appears to be related to Monomorium minor, a yellow species from Namibia and Angola which itself seems to be intermediate between this complex and the viator-complex, but the wide separation of their habitats and the differences in their scape indices stand against this apparent relationship.

Fresh material will have to be obtained before a clear picture of what constitutes carbo can be developed.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Afrotropical Region: Eritrea, Saudi Arabia, United Arab Emirates.
Palaearctic Region: Ethiopia (type locality), Oman.

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Queens and males are unknown.

Nomenclature

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

  • carbo. Monomorium salomonis var. carbo Forel, 1910c: 251 (w.) ETHIOPIA. Combination in M. (Xeromyrmex): Wheeler, W.M. 1922a: 870. Raised to species: Bolton, 1987: 339.

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

Description

Worker

Bolton (1987) - TL 2.3-2.4, HL 0.60-0.63, HW 0.43-0.45, CI 71-72, SL 0.44-0.48, SI 102-107, PW 0.30-0.31, AL 0.66-0.70 (2 measured).

Anterior margin of median portion of clypeus shallowly concave. With head in full-face view the sides weakly divergent from back to front, the occipital margin shallowly concave. Maximum diameter of eye 0.24-0.26 x HW and with 7 ommatidia in the longest row. The eyes very slightly in front of the midlength of the sides. Metanotal groove scarcely impressed in profile, the propodeal dorsum flattened to weakly depressed medially, without sharp lateral margins. Occipital margin of head with a pair of hairs straddling the midline and another pair closer to the occipital corners. Dorsal alitrunk without hairs. Petiole and postpetiole each with 1-2 pairs of backward directed hairs. First gastral tergite with numerous hairs which are evenly distributed over the surface in front of the apical transverse row. Dorsum of head opaque, shagreenate-punctulate everywhere. Dorsal alitrunk finely reticulate-punctate, the sides similarly sculptured but somewhat effaced on the sides of the pronotum. First gastral tergite shining, with superficial reticular patterning only. Colour uniform dark brown to blackish brown.

Type Material

Monomorium salomonis var. carbo Forel, 1910d: 251. Syntype workers, ETHIOPIA: Ghinda (K. Escherich) (Musee d'Histoire Naturelle Genève) [examined].

References

  • Bolton, B. 1987. A review of the Solenopsis genus-group and revision of Afrotropical Monomorium Mayr (Hymenoptera: Formicidae). Bull. Br. Mus. (Nat. Hist.) Entomol. 54: 263-452 (page 339, Raised to species)
  • Forel, A. 1910c. Ameisen aus der Kolonie Erythräa. Gesammelt von Prof. Dr. K. Escherich (nebst einigen in West-Abessinien von Herrn A. Ilg gesammelten Ameisen). Zool. Jahrb. Abt. Syst. Geogr. Biol. Tiere 29: 243-274 (page 251, worker described)
  • Wheeler, W. M. 1922j. Ants of the American Museum Congo expedition. A contribution to the myrmecology of Africa. VIII. A synonymic list of the ants of the Ethiopian region. Bull. Am. Mus. Nat. Hist. 45: 711-1004 (page 870, Combination in M. (Xeromyrmex))