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Monomorium anceps
| Monomorium anceps | |
|---|---|
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Hymenoptera |
| Family: | Formicidae |
| Subfamily: | Myrmicinae |
| Tribe: | Solenopsidini |
| Genus: | Monomorium |
| Species: | M. anceps |
| Binomial name | |
| Monomorium anceps Emery, 1895
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Specimen records show this species is commonly captured in pitfall traps and leaf litter samples. It has been found in habitats ranging from open (e.g., grassland), semi-open (e.g., Euclea Open Woodland ), to closed woodlands (e.g., Acacia Closed Woodland) at elevations from 100 - 1690 meters.
Identification
Bolton (1987) - A member of the M. australe complex in the M. salomonis species group.
Monomorium australe and its close relatives M. anceps and Monomorium termitarium, are members of the salomonis-group and may represent only a single species, but more material is necessary before any sound conclusions can be drawn.
As the three names M. australe, M. anceps and M. termitarium constitute a very close triad which may represent only one real species, the usual format of the revision is abandoned here so that the three may be considered together.
These three southern African forms are retained for the present as separate species until more material is collected for study, at which time it may be possible to show whether they are indeed separate or whether two or all of them are synonymous. All three are represented only by short syntypic series at the time of writing. The three together are characterized by the following snared characters within the salomonis group.
Relatively small forms, their combined dimensions being TL 2.4-2.6, HL 0.60-0.66, HW 0.46-0.52, CI 75-79, SL 0.47-0.54, SI 100-104, PW 0.30-0.35, AL 0.68.0-76. Maximum diameter of eye 0.24-0.26 x HW and with 7-9 ommatidia in the longest row. [Note that this combined range of dimensions is no greater than those frequently encountered in what are indubitably single species elsewhere in this species-group.]
Head with feebly developed shagreenate-granular sculpture so that the cephalic dorsum appears weakly shining and semi-smooth. Dorsal alitrunk lacking standing hairs of any description. Petiole with a single pair of backward directed hairs, postpetiole with 1-2 pairs of hairs. First gastral tergite with 2-3 pairs of hairs in front of the apical transverse row, the hairs confined to the basal half of the sclerite.
Within the limits of this diagnosis the dimensions of the three are as follows.
M. termitarium syntypes, TL 2.5-2.6, HL 0.60-0.64, HW 0.46-0.51 , CI 75-79, SL 0.48-0.53, SI 100-104, PW 0.30-0.35, AL 0.70-0.76; maximum diameter of eye 0.24-0.25 x HW, with 7-8 ommatidia in the longest row (6 measured).
M. australe syntypes, TL 2.5-2.6, HL 0.64-0.66, HW 0.50-0.52, CI 78-79, SL 0.50-0.54, SI 100-104, PW 0.32-0.34, AL 0.74-0.76; maximum diameter of eye 0.25-0.26 x HW, with 9 ommatidia in the longest row (4 measured).
M. anceps syntypes, TL 2.4, HL 0.60, HW 0.47, CI 78, SL 0.47, SI 100, PW 0.30, AL 0.68; maximum diameter of eye 0.26 x HW, with 7-8 ommatidia in the longest row (2 measured).
Characters which presently serve to isolate the three syntypic series include colour, sculpture and gastral pilosity, but all are weak and may prove to be gradient. For the present the differentiation is as follows.
M. termitarium is a uniformly yellow species from Botswana in which the mesonotal dorsum is superficially reticulate-punctate. The pronotal dorsum is similarly sculptured but the sculpture is more reduced and somewhat effaced so that the punctures are vestigial. In other words the pronotal dorsal sculpture is obviously a reduced and effaced version of that seen on the mesonotum. Two pairs of hairs are present on the basal half of the first gastral tergite.
M. australe, from Cape Province, South Africa, is a medium brown species with a darker brown gaster. Dorsal alitrunk sculpture corresponds with the above, being reticulate-punctate on the mesonotum and feebly reticulate on the pronotum, again the pronotal sculpture obviously a reduced and effaced version ofthe mesonotal. The syntypes show varying degrees of abrasion but it appears that two pairs of hairs occur on the basal half of the first gastral tergite.
M. anceps, from Transvaal, South Africa, is medium brown with a darker brown gaster. The mesonotal dorsum is sharply reticulate-punctate whilst the pronotal dorsum is finely shagreenate. In other words the two areas show distinctly contrasting sculpture and the pronotal component does not appear to be merely a reduced and effaced version of that seen on the mesonotum. Three pairs of hairs occur on the basal half of the first gastral tergite.
Keys including this Species
Distribution
Latitudinal Distribution Pattern
Latitudinal Range: -24.90998° to -30.5°.
| North Temperate |
North Subtropical |
Tropical | South Subtropical |
South Temperate |
- Source: AntMaps
Distribution based on Regional Taxon Lists
Afrotropical Region: South Africa (type locality).
Distribution based on AntMaps
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
   
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| Syntype of Monomorium subopacum anceps. Worker. Specimen code casent0904598. Photographer Will Ericson, uploaded by California Academy of Sciences. | Owned by MSNG, Genoa, Italy. |
Nomenclature
The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.
- anceps. Monomorium subopacum var. anceps Emery, 1895h: 24 (w.) SOUTH AFRICA.
- Type-material: syntype workers (number not stated).
- Type-locality: South Africa: Transvaal, Hamman’s Kraal, 1893 (E. Simon).
- Type-depository: MSNG.
- Combination in M. (Xeromyrmex): Wheeler, W.M. 1922a: 872.
- As unavailable (infrasubspecific) name: Arnold, 1916: 225; Emery, 1922e: 178; Wheeler, W.M. 1922a: 872.
- Subspecies of subopacum: Ettershank, 1966: 87.
- Status as species: Bolton, 1987: 336 (redescription); Bolton, 1995b: 259.
- Distribution: South Africa.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Description
Type Material
Bolton (1987) - Syntype workers, South Africa: Transvaal, Hamann's Kraal (E. Simon) (Museo Civico di Storia Naturale, Genoa) [examined].
References
- Bolton, B. 1987. A review of the Solenopsis genus-group and revision of Afrotropical Monomorium Mayr (Hymenoptera: Formicidae). Bulletin of the British Museum (Natural History). Entomology. 54: 263-452. (page 336, Raised to species)
- Emery, C. 1895i. Voyage de M. E. Simon dans l'Afrique australe (janvier-avril 1893). 3e mémoire. Formicides. Ann. Soc. Entomol. Fr. 64:15-56. (page 24, 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 872, Combination in M. (Xeromyrmex))
References based on Global Ant Biodiversity Informatics
- Ettershank G. 1966. A generic revision of the world Myrmicinae related to Solenopsis and Pheidologeton (Hymenoptera: Formicidae). Aust. J. Zool. 14: 73-171.
- Wheeler W. M. 1922. 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. Bulletin of the American Museum of Natural History 45: 711-1004