Nesomyrmex

Nesomyrmex Temporal range: 20.43–0 Ma K Pa Eo Ol Mi Pl Early Miocene – Recent
Nesomyrmex angulatus
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Myrmicinae
Tribe:	Crematogastrini
Genus:	Nesomyrmex Wheeler, W.M., 1910
Type species
Nesomyrmex clavipilis
Diversity
84 species 2 fossil species (Species Checklist, Species by Country) Nesomyrmex angulatus Specimen Label
Synonyms
Caulomyrma Forel, 1914 Goniothorax Emery, 1896 Ireneopone Donisthorpe, 1946 Limnomyrmex Arnold, 1948 Meia Pagliano & Scaramozzino, 1990 Tetramyrma Forel, 1912

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) - Nesomyrmex, formerly a subgenus of the large and almost cosmopolitan Leptothorax, was raised to genus in 2003 (Bolton, 2003) and 52 species can be encountered in the tropics and subtropics of the Neotropical, Malagasy and Afrotropical regions (Bolton, 2012). The biology of the genus is not well studied. Most species prefer arid habitats while a few live in rainforests. Generally, Nesomyrmex ants can nest either in the soil, as most South African species do, or in trees (Mbanyana & Roberson, 2008), often in pre-existing cavities.

Identification

Superficially, Nesomyrmex workers with a rounded propodeum that lacks spines can be confused with Monomorium, but can be distinguished by lacking the isolated median setae on the anterior clypeal margin. Those species of Nesomyrmex that have the propodeum armed or angulate, superficially resemble Tetramorium species, and can be separated from them mainly by the lateral portions of clypeus, which are not raised into a narrow ridge or shield-wall in front of the antennal insertions, unlike in Tetramorium. Nesomyrmex can also be confused with Cardiocondyla because the median portion of the clypeus extends over the mandibles in both genera. They are most easily distinguished by the shape of the postpetiole in dorsal view, which in Cardiocondyla is considerably broader than the petiolar node. In addition, the eyes of Cardiocondyla are in front of the midlength of the sides whereas in Nesomyrmex they are at the midlength. (Mbanyana and Robertson 2008)

Nesomyrmex species groups of the Afrotropical and Malagasy regions

See images of species within this genus

Keys including this Genus

• Key to North American Genera of Myrmicinae

 

Keys to Species in this Genus

• Key to Nesomyrmex of southern Africa
• Key to Nesomyrmex species groups of the Malagasy region
• Key to Nesomyrmex hafahafa group
• Key to Afrotropical Nesomyrmex
• Key to Malagasy Nesomyrmex angulatus group workers
• Key to Afrotropical Nesomyrmex angulatus group workers
• Key to Nesomyrmex species groups of the Afrotropical region
• Key to Arabian Nesomyrmex
• Key to Nesomyrmex brevicornis group species
• Key to Malagasy Nesomyrmex sikorai group workers
• Key to Malagasy Nesomyrmex madecassus species-group workers
• Key to Nesomyrmex species of Neotropical region

Distribution

Fossils

Fossils are known from: Dominican amber, Dominican Republic (Burdigalian, Early Miocene).

Biology

Life History Traits

• Mean colony size: ~22-47 to "rarely" >100 (Greer et al., 2021)
• Compound colony type: not parasitic (Greer et al., 2021)
• Nest site: hypogaeic; arboreal (Greer et al., 2021)
• Diet class: omnivore (Greer et al., 2021)
• Foraging stratum: subterranean/leaf litter; arboreal (Greer et al., 2021)
• Foraging behaviour: cooperative (Greer et al., 2021)

Morphology

Worker Morphology

• Antennal segment count: 11, 12 • Antennal club: 3 • Palp formula: 5,3 • Total dental count: 3-5 • Spur formula: 2 simple, 2 simple; 0, 0 • Eyes: 11->100 ommatidia • Pronotal Spines: absent • Mesonotal Spines: absent • Propodeal Spines: dentiform; present • Petiolar Spines: absent • Caste: none or weak • Sting: present • Metaplural Gland: present • Cocoon: absent

Male Morphology

 • Antennal segment count 12; 13 • Antennal club 0 • Palp formula 5,3 • Total dental count 5 • Spur formula 0, 0

Nomenclature

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

• NESOMYRMEX [Myrmicinae: Formicoxenini]
  • Nesomyrmex Wheeler, W.M. 1910a: 259. Type-species: Nesomyrmex clavipilis, by monotypy.
  • Nesomyrmex subgenus of Leptothorax: Emery, 1915g: 24; Wheeler, W.M. 1922a: 679; Smith, M.R. 1950: 30; Smith, M.R. 1951a: 816; Kempf, 1959c: 393; Brown, 1971a: 4; Kempf, 1972a: 133; Smith, D.R. 1979: 1391.
  • Nesomyrmex as genus: Francoeur & Loiselle, 1988b: 43 (possibly valid); Hölldobler & Wilson, 1990: 14 [junior synonyms of Nesomyrmex left under Leptothorax]; Jaffe, 1993: 11.
  • Nesomyrmex junior synonym of Goniothorax: Emery, 1924d: 249; Donisthorpe, 1943f: 674. [Incorrect procedure as Goniothorax is a junior homonym for which Nesomyrmex is the first available replacement name, see Smith, M.R. 1950: 30.]
  • Nesomyrmex senior synonym of Caulomyrma: Emery, 1915g: 24; Forel, 1915c: 364.
  • Nesomyrmex senior synonym of Limnomyrmex: Brown, 1971a: 4.
  • Nesomyrmex senior synonym of Meia: Bolton, 1994: 105.
  • Nesomyrmex junior synonym of Leptothorax: Bolton, 1982: 319.
  • Nesomyrmex revived from synonymy with status as genus and senior synonym of Caulomyrma, Ireneopone, Limnomyrmex, Meia, Tetramyrma: Bolton, 2003: 249, 272.
• CAULOMYRMA [junior synonym of Nesomyrmex]
  • Caulomyrma Forel, 1914d: 233 [as subgenus of Leptothorax]. Type-species: Leptothorax echinatinodis, by original designation.
  • Caulomyrma junior synonym of Nesomyrmex: [Forel, 1915c: 364 (provisional synonym)]; Emery, 1915g: 24.
  • [Caulomyrma and Nesomyrmex junior synonyms of Goniothorax: Emery, 1924d: 249 (incorrect procedure as Goniothorax is a junior homonym for which Nesomyrmex is the first available replacement name; see Smith, M.R. 1950: 30).]
• GONIOTHORAX [junior homonym, see Nesomyrmex]
  • Goniothorax Emery, 1896g: 58 (diagnosis in key) [as subgenus of Leptothorax]. Type-species: Leptothorax vicinus, by subsequent designation of Wheeler, W.M. 1911f: 164. [Junior homonym of Goniothorax Milne-Edwards, 1879: 103 (Crustacea).]
  • Goniothorax Emery senior synonym of Caulomyrma, Nesomyrmex: Emery, 1924d: 249. Nesomyrmex is oldest junior synonym of Goniothorax Emery and hence first available replacement name: Smith, M.R. 1950: 30.
  • [Goniothorax as subgenus of Leptothorax: Wheeler, W.M. 1910g: 139; Forel, 1917: 244; Wheeler, W.M. 1922a: 679; Emery, 1924d: 249; Creighton, 1950a: 259.]
• IRENEOPONE [junior synonym of Nesomyrmex]
  • Ireneopone Donisthorpe, 1946d: 242. Type-species: Ireneopone gibber, by original designation.
  • Ireneopone junior synonym of Nesomyrmex: Bolton, 2003: 250, 272.
• LIMNOMYRMEX [junior synonym of Nesomyrmex]
  • Limnomyrmex Arnold, 1948: 222. Type-species: Limnomyrmex stramineus, by original designation.
  • Limnomyrmex junior synonym of Nesomyrmex: Brown, 1971a: 4.
  • Limnomyrmex junior synonym of Leptothorax: Bolton, 1982: 319.
  • Limnomyrmex junior synonym of Nesomyrmex: Bolton, 2003: 250, 272.
• MEIA [junior synonym of Nesomyrmex]
  • Meia Pagliano & Scaramozzino, 1990: 5. [Unnecessary replacement name for Goniothorax Emery, 1896g: 58; junior homonym of Goniothorax Milne-Edwards, 1879: 103 (Crustacea).]
  • [Nesomyrmex is the first available replacement name for Goniothorax Emery, therefore Meia is automatically a junior synonym of Nesomyrmex: Bolton, 1994: 105.]
• TETRAMYRMA [junior synonym of Nesomyrmex]
  • Tetramyrma Forel, 1912m: 766 [as subgenus of Dilobocondyla]. Type-species: Dilobocondyla (Tetramyrma) braunsi, by monotypy.
  • Tetramyrma raised to genus: Forel, 1913a: 122.
  • Tetramyrma junior synonym of Leptothorax: Bolton, 1982: 319.
  • Tetramyrma junior synonym of Nesomyrmex: Bolton, 2003: 249, 272.

References

• Barden, P. 2017. Fossil ants (Hymenoptera: Formicidae): ancient diversity and the rise of modern lineages. Myrmecological News 24: 1-30.
• Bolton, B. 1982. Afrotropical species of the myrmecine ant genera Cardiocondyla, Leptothorax, Melissotarsus, Messor and Cataulacus (Formicidae). Bulletin of the British Museum (Natural History). Entomology, 46: 307-370 (page 319, Nesomyrmex as junior synonym of Leptothorax)
• Bolton, B. 1994. Identification guide to the ant genera of the world. Cambridge, Mass.: Harvard University Press, 222 pp. (page 105, Nesomyrmex as junior synonym of Leptothorax; Nesomyrmex senior synonym of Meia)
• Bolton, B. 1995b. A new general catalogue of the ants of the world. Cambridge, Mass.: Harvard University Press, 504 pp. (page 39, Nesomyrmex as junior synonym of Leptothorax)
• Bolton, B. 2003. Synopsis and Classification of Formicidae. Mem. Am. Entomol. Inst. 71: 370pp (page 249, 272, Nesomyrmex revived from synonymy with status as genus and senior synonym of Caulomyrma, Ireneopone, Limnomyrmex, Meia, Tetramyrma)
• Boudinot, B.E. 2019. Hormigas de Colombia. Cap. 15. Clave para las subfamilias y generos basada en machos. Pp. 487-499 in: Fernández, F., Guerrero, R.J., Delsinne, T. (eds.) 2019d. Hormigas de Colombia. Bogotá: Universidad Nacional de Colombia, 1198 pp.
• Brown, W. L., Jr. 1971a. Characters and synonymies among the genera of ants. Part IV. Some genera of subfamily Myrmicinae (Hymenoptera: Formicidae). Breviora 365: 1-5 (page 4, Nesomyrmex as subgenus of Leptothorax; Nesomyrmex senior synonym of Limnomyrmex)
• Brown, W. L., Jr. 1973b. A comparison of the Hylean and Congo-West African rain forest ant faunas. Pp. 161-185 in: Meggers, B. J., Ayensu, E. S., Duckworth, W. D. (eds.) Tropical forest ecosystems in Africa and South America: a comparative review. Washington, D.C.: Smithsonian Institution Press, viii + 350 pp. (page 183, Nesomyrmex as junior synonym of Leptothorax [provisional])
• Cantone S. 2018. Winged Ants, The queen. Dichotomous key to genera of winged female ants in the World. The Wings of Ants: morphological and systematic relationships (self-published).
• Csösz, S. and Fisher, B.L. 2015. Diagnostic survey of Malagasy Nesomyrmex species-groups and revision of hafahafa group species via morphology based cluster delimitation protocol. ZooKeys. 526:19-59.
• Donisthorpe, H. 1943g. A list of the type-species of the genera and subgenera of the Formicidae. [part]. Ann. Mag. Nat. Hist. 11(10): 617-688 (page 674, Nesomyrmex as junior synonym of Goniothorax [Goniothorax is a junior homonym and hence Nesomyrmex takes priority as first available replacment name.])
• Emery, C. 1915e. Formiche raccolte nell'Eritrea dal Prof. F. Silvestri. Boll. Lab. Zool. Gen. Agrar. R. Sc. Super. Agric. 10: 3-26 (page 24, Nesomyrmex as subgenus of Leptothorax; Nesomyrmex senior synonym of Caulomyrma)
• Emery, C. 1924f [1922]. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [concl.]. Genera Insectorum 174C: 207-397 (page 249, Nesomyrmex as junior synonym of Goniothorax)
• Fernandez, F., Guerrero, R.J., Sánchez-Restrepo, A.F. 2021. Sistemática y diversidad de las hormigas neotropicales. Revista Colombiana de Entomología 47, 1–20 (doi:10.25100/socolen.v47i1.11082).
• Forel, A. 1917. Cadre synoptique actuel de la faune universelle des fourmis. Bull. Soc. Vaudoise Sci. Nat. 51: 229-253 (page 244, Nesomyrmex as subgenus of Leptothorax)
• Hölldobler, B.; Wilson, E. O. 1990. The ants. Cambridge, Mass.: Harvard University Press, xii + 732 pp. (page 14, Nesomyrmex as genus [junior synonyms of Nesomyrmex left behind under Leptothorax])
• Jaffe, K. 1993. El mundo de las hormigas. Baruta, Venezuela: Equinoccio (Ediciones de la Universidad Simón Bolívar), 188 pp. (page 11, Nesomyrmex as genus)
• Kempf, W. W. 1959d. A synopsis of the New World species belonging to the Nesomyrmex-group of the ant genus Leptothorax Mayr (Hymenoptera: Formicidae). Stud. Entomol. (n.s.) 2: 391-432 (page 393, Nesomyrmex as subgenus of Leptothorax)
• Kempf, W. W. 1972b. Catálogo abreviado das formigas da regia~o Neotropical. Stud. Entomol. 15: 3-344 (page 133, Nesomyrmex as subgenus of Leptothorax)
• Mackay, W. P. 2000. A review of the New World ants of the subgenus Myrafant, (genus Leptothorax) (Hymenoptera: Formicidae). Sociobiology 36: 265-444 (page 272, Nesomyrmex as subgenus of Leptothorax (in key))
• Mbanyana, N. and Robertson, H.G. 2008. Review of the ant genus Nesomyrmex in southern Africa. African Natural History 4: 35-55.
• Milne-Edwards, A. 1879. Description de quelques crustacés nouveaux. Bull. Soc. Philomath. Paris (7) 3: 103-110 (page 103, Goniothorax (Crustacea) senior homonym of Goniothorax Emery, 1896)
• Smith, D. R. 1979. Superfamily Formicoidea. Pp. 1323-1467 in: Krombein, K. V., Hurd, P. D., Smith, D. R., Burks, B. D. (eds.) Catalog of Hymenoptera in America north of Mexico. Volume 2. Apocrita (Aculeata). Washington, D.C.: Smithsonian Institution Press, pp. i-xvi, 1199-2209. (page 1391, Nesomyrmex as subgenus of Leptothorax)
• Smith, M. R. 1950a. On the status of Leptothorax Mayr and some of its subgenera. Psyche (Camb.) 57: 29-30 (page 30, Nesomyrmex as subgenus of Leptothorax)
• Smith, M. R. 1951c. Family Formicidae. Pp. 778-875 in: Muesebeck, C. F., Krombein, K. V., Townes, H. K. (eds.) Hymenoptera of America north of Mexico. Synoptic catalogue. U. S. Dep. Agric. Agric. Monogr. 2:1-1420. (page 816, Nesomyrmex as subgenus of Leptothorax)
• Wheeler, W. M. 1910d. Three new genera of myrmicine ants from tropical America. Bull. Am. Mus. Nat. Hist. 28: 259-265 (page 259, Nesomyrmex as genus)
• 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 679, Nesomyrmex as subgenus of Leptothorax)