Atopomyrmex

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Atopomyrmex
Atopomyrmex mocquerysi
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Atopomyrmex
André, 1889
Type species
Atopomyrmex mocquerysi
Diversity
3 species
(Species Checklist)

Atopomyrmex mocquerysi casent0178286 profile 1.jpg

Atopomyrmex mocquerysi

Atopomyrmex mocquerysi casent0178286 dorsal 1.jpg

Specimen Label

Evolutionary Relationships

Rostromyrmex






Cardiocondyla



Ocymyrmex






Nesomyrmex



Xenomyrmex





Terataner




Atopomyrmex



Cataulacus










Carebara



Diplomorium






Melissotarsus



Rhopalomastix






Calyptomyrmex



Tetramorium





Cyphoidris



Dicroaspis










Aretidris



Vollenhovia





Dacetinops



Indomyrma








Crematogaster



Meranoplus






Lophomyrmex




Adlerzia



Recurvidris






Stereomyrmex




Trichomyrmex





Eutetramorium




Royidris




Malagidris



Vitsika








Huberia



Podomyrma





Liomyrmex



Metapone













Kartidris



Mayriella





Tetheamyrma




Dacatria



Proatta









Dilobocondyla



Secostruma






Acanthomyrmex



Myrmecina





Perissomyrmex



Pristomyrmex









some Lordomyrma



Propodilobus





Lasiomyrma




[some Lordomyrma




Ancyridris



some Lordomyrma









Paratopula




Poecilomyrma




Romblonella



Rotastruma








Gauromyrmex



Vombisidris





Temnothorax




Harpagoxenus



Formicoxenus



Leptothorax













Based on Ward et al. (2014) and Blaimer et al. (2018).

Hita Garcia, Wiesel and Fischer (2013) - Atopomyrmex is endemic to the Afrotropical zoogeographical region and with only three species is a relatively small genus. Nevertheless, the distribution of the genus extends to much of Sub-Saharan Africa. Atopomyrmex was revised by Bolton (1981a) who recognised two species, and a third was later described by Snelling (1992). Species identification can be easily performed with the species key from Bolton (1981a) and the diagnostic notes in Snelling (1992). Atopomyrmex are highly polymorphic, arboreal ants that nest in living wood (Bolton, 1981a; Kenne et al., 2009). From one species it is known that its wood-excavating nest activities cause the tree branches to dry out (Kenne et al., 2009). Atopomyrmex ants forage in the vegetation or on the ground and their diet is variable. It can consist of honeydew or small arthropods. In addition, they seem to prefer the canopy stratum of secondary forests or woodlands, but are only rarely encountered in old growth forests (Kenne et al, 2009; F.H.G. & G.F., unpublished data).

Identification

Bolton (1981) - The genus most closely related to Atopomyrmex is the Ethiopian and Malagasy genus Terataner. Differences separating them, and other related genera, are noted in the discussion of Terataner (p. 290). At its inception Atopomyrmex contained only Atopomyrmex mocquerysi. Soon afterwards Atopomyrmex cryptoceroides was added and this was followed by a number of others, added later by several authors. Later still these extra species were progressively removed from Atopomyrmex until the present time, when mocquerysi and cryptoceroides are again its only members. These species, originally described in Atopomyrmex but now placed elsewhere, are as follows. The species alluaudi Emery, bottegoi Emery, foreli Emery, luteus Emery, scotti Forel, and steinheili Forel were transferred to Terataner by Emery (1912); nodifier Emery was originally made type-species of genus Atopula Emery but is now included in [Tetramorium]] Mayr, see Bolton (1976; 1980); selebensis Emery was made type-species of Dilobocondyla Santschi, by Santschi (1910); escherichi Forel was transferred to Dilobocondyla by Forel (1913c); ceylonicus Emery was made type-species of Paratopula Wheeler, by Wheeler (1919).

Distribution

World distribution based on political regions. View/Edit Data
Atopomyrmex Distribution.png Worlddistribution legend.jpg

Species richness

Species richness by country based on regional taxon lists (countries with darker colours are more species-rich). View Data

Atopomyrmex Species Richness.png

Biology

Bolton (1981) - Atopomyrmex is a small genus of strongly polymorphic arboreal ants. The two species included, Atopomyrmex mocquerysi and Atopomyrmex cryptoceroides, nest in the wood of standing trees and forage arboreally, frequently coming down the trunk but only rarely venturing onto the ground. Arnold (1916) points out that mocquerysi is usually carnivorous and, when disturbed, exudes a whitish secretion from the anal glands. Nests are made in hollow stems or rotten parts of standing timber but it is not known if the species tunnel their own galleries or take over the galleries of termites and boring beetles. Of the two species mocquerysi is very widely distributed, being found in wooded and forested areas almost throughout sub-Saharan Africa; Wheeler (1922: 181) gives a distribution map. A. cryptoceroides has a more limited range, being confined to the rain-forest zones of west of central Africa, where it is sympatric with mocquerysi.

Castes

Morphology

Worker Morphology

 • Antennal segment count 9, 10, 12 • Antennal club 3 • Palp formula 5,3; 4,3 • Total dental count 4-7 • Spur formula 0, 0 • Eyes present • Scrobes absent • Caste polymorphic • Sting present

Nomenclature

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

  • ATOPOMYRMEX [Myrmicinae: Formicoxenini]
    • Atopomyrmex André, 1889: 226. Type-species: Atopomyrmex mocquerysi, by monotypy.

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

Snelling (1992) - The following new species is at variance with the generic characterization provided by Bolton, and that characterization must now be modified. In the brief descriptive statements below, the character state as described by Bolton is indicated in parentheses.

Palpal formula 5,3 in all sizes (4,3). Antenna 9-segmented, with short, stout scape and thickly clavate flagellum (12-segmented, scape slender, flagellum longer and with distinct 3-segmented club). Pronotum hardly marginate at side (bluntly marginate). Promesonotal suture distinct across dorsum in small workers (obsolete in workers of all sizes). Mesonotum not tuberculate in profile (tuberculate) and larger workers without transverse impression at midlength (transverse impression present). Petiole without dorsal spine pair (spines present). Head and body with numerous standing hairs (standing hairs absent except on mouthparts, flagellum, and gastral sterna).

Bolton (1981) - Polymorphic arboreal myrmicine ants. Mandibles short and stout, the apical (masticatory) margin armed in smallest workers with 2 teeth followed by 2 denticles and an unarmed straight edge; in slightly larger workers the edge crenulate or feebly denticulate. Most medium-sized and large workers with 2 teeth + 4-5 denticles but in large workers all the teeth may be worn down and rounded. Palp formula 4, 3 in all sizes; in smallest workers the two basalmost maxillary palp segments may be partially fused. Median portion of clypeus shield-like, broad, posteriorly broadly inserted between the frontal lobes. Anterior clypeal margin indented to concave medially, the median portion separated from the lateral parts by a longitudinal carina on each side. Anterior tentorial pit represented by a deep and sharply incised hole which is roughly circular, situated immediately behind the clypeus close to the antennal insertions and more obvious in larger workers. Development of frontal carinae varying with worker size. In smallest workers short and only feebly divergent, ending in front of the level of the anterior margins of the eyes. In largest workers extending back beyond the level of the posterior margins of the eyes and strongly divergent from source to level of eyes; behind this roughly parallel. Workers between largest and smallest showing intermediate development of frontal carinae. Antennal scrobes absent in smallest workers, becoming longer and deeper with increasing size; conspicuous and capable of accommodating the scape in largest workers. Antennae 12-segmented with a 3-segmented club. With head in full-face view the eyes situated behind the midlength of the sides, and the occipital corners broadly and evenly rounded. Pronotum more or less flat to shallowly concave transversely, bluntly marginate laterally, the margination more acute in smaller workers. Promesonotal suture vestigial to absent from dorsum but at sides forming an impression separating pronotum and mesonotum. Mesonotum in profile usually broadly and bluntly bituberculate behind, then sloping almost vertically to the broad metanotal groove. In medium to large workers the mesonotum with a shallow but quite broad transverse impression at about the midlength. Propodeum in profile raised immediately behind the metanotal groove then sloping downwards to a pair of strong spines. Metapleural lobes inconspicuous, very narrow and low. Propodeal spiracle circular. Lower margin of metapleuron without a broad groove running forward from the orifice of the metapleural glands; instead the margin rounded and folded under, giving the appearance of being smoothly eroded away, the hind coxa appearing to rest upon the bulla of the metapleural gland. Ventral surface of alitrunk with a very conspicuous roughly circular deep pit between the hind coxae, a sieve-plate apparently present at the bottom of the pit. Petiole dorsally with a pair of short stout spines of variable size. Dorsal surfaces of head and body without standing hairs, such hairs present only on mouthparts and gastral sternites.

References

  • André, E. 1889. Hyménoptères nouveaux appartenant au groupe des Formicides. Rev. Entomol. (Caen) 8: 217-231 (page 226, Atopomyrmex as genus)
  • Arnold, G. 1916. A monograph of the Formicidae of South Africa. Part II. Ponerinae, Dorylinae. Ann. S. Afr. Mus. 14: 159-270 (page 190, Atopomyrmex in Myrmicinae, Myrmecinini)
  • Ashmead, W. H. 1905c. A skeleton of a new arrangement of the families, subfamilies, tribes and genera of the ants, or the superfamily Formicoidea. Can. Entomol. 37: 381-384 (page 383, Atopomyrmex in Myrmicinae, Stenammini)
  • Bolton, B. 1981b. A revision of six minor genera of Myrmicinae (Hymenoptera: Formicidae) in the Ethiopian zoogeographical region. Bull. Br. Mus. (Nat. Hist.) Entomol. 43: 245-307 (page 249, Revision of genus)
  • Bolton, B. 1994. Identification guide to the ant genera of the world. Cambridge, Mass.: Harvard University Press, 222 pp. (page 105, Atopomyrmex in Myrmicinae: Formicoxenini)
  • Bolton, B. 2003. Synopsis and Classification of Formicidae. Mem. Am. Entomol. Inst. 71: 370pp (page 244, Atopomyrmex in Myrmicinae: Formicoxenini)
  • Dalla Torre, K. W. von. 1893. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. Vol. 7. Formicidae (Heterogyna). Leipzig: W. Engelmann, 289 pp. (page 60, Atopomyrmex in Myrmicinae)
  • Dlussky, G. M.; Fedoseeva, E. B. 1988. Origin and early stages of evolution in ants. Pp. 70-144 in: Ponomarenko, A. G. (ed.) Cretaceous biocenotic crisis and insect evolution. Moskva: Nauka, 232 pp. (page 79, Atopomyrmex in Myrmicinae, Podomyrmini)
  • Emery, C. 1895l. Die Gattung Dorylus Fab. und die systematische Eintheilung der Formiciden. Zool. Jahrb. Abt. Syst. Geogr. Biol. Tiere 8: 685-778 (page 769, Atopomyrmex in Myrmicinae, Myrmicini)
  • Emery, C. 1912b. Études sur les Myrmicinae. [I-IV.]. Ann. Soc. Entomol. Belg. 56: 94-105 (page 105, Atopomyrmex in Myrmicinae, Myrmecinini)
  • Emery, C. 1914e. Intorno alla classificazione dei Myrmicinae. Rend. Sess. R. Accad. Sci. Ist. Bologna Cl. Sci. Fis. (n.s.) 18: 29-42 (page 41, Atopomyrmex in Myrmicinae, Myrmecinini)
  • Emery, C. 1924f [1922]. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [concl.]. Genera Insectorum 174C: 207-397 (page 239, Atopomyrmex in Myrmicinae, Myrmecinini [subtribe Podomyrmini])
  • Forel, A. 1917. Cadre synoptique actuel de la faune universelle des fourmis. Bull. Soc. Vaudoise Sci. Nat. 51: 229-253 (page 244, Atopomyrmex in Myrmicinae, Myrmecinini)
  • Snelling, R. R. 1992a. Two unusual new myrmicine ants from Cameroon (Hymenoptera: Formicidae). Psyche (Camb.) 99: 95-101 PDF
  • Wheeler, W. M. 1910b. Ants: their structure, development and behavior. New York: Columbia University Press, xxv + 663 pp. (page 139, Atopomyrmex in Myrmicinae, Myrmicini)
  • Wheeler, W. M. 1922i. Ants of the American Museum Congo expedition. A contribution to the myrmecology of Africa. VII. Keys to the genera and subgenera of ants. Bull. Am. Mus. Nat. Hist. 45: 631-710 (page 663, Atopomyrmex in Myrmicinae, Myrmecinini)