Ochetomyrmex

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Ochetomyrmex
Ochetomyrmex semipolitus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Ochetomyrmex
Mayr, 1878
Type species
Ochetomyrmex semipolitus
Diversity
2 species
(Species Checklist)

Ochetomyrmex-semipolitus-MCZ001L.jpg

Ochetomyrmex-semipolitus-MCZ001D.jpg

Specimen Label

Synonyms
Evolutionary Relationships
Attini


Ochetomyrmex
  (2 species)



Tranopelta
  (2 species)





Allomerus (8 species), Blepharidatta (4 species), Diaphoromyrma (1 species), Lachnomyrmex (16 species), Wasmannia (11 species)






Acanthognathus (7 species), Colobostruma (16 species), Daceton (2 species), Epopostruma (19 species), Lenomyrmex (7 species), Mesostruma (9 species), Microdaceton (4 species), Orectognathus (29 species),




Acromyrmex (62 species), Apterostigma (44 species), Atta (19 species), Cyatta (1 species), Cyphomyrmex (23 species), Kalathomyrmex (1 species), Mycetophylax (21 species), Mycetagroicus (4 species), Mycetarotes (4 species), Mycetosoritis (2 species), Mycocepurus (6 species), Myrmicocrypta (31 species), Sericomyrmex (11 species), Trachymyrmex (49 species), Xerolitor (1 species)



Basiceros (8 species), Cephalotes (119 species), Eurhopalothrix (53 species), Octostruma (34 species), Phalacromyrmex (1 species), Pheidole (1,141 species), Pilotrochus (1 species), Procryptocerus (45 species), Protalaridris (7 species), Rhopalothrix (16 species), Strumigenys (836 species), Talaridris (1 species)








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

Biological information is limited to habitat (cerrado, wet forest, rainforest) and collection information (found in leaf litter, from pitfalls and at bait) taken from specimen labels of these rarely collected ants. There are only two known species of Ochetomyrmex.

Identification

Fernández (2003) - The following combination of characters, unique among myrmicine ants, allows the separation of Ochetomyrmex from all other genera: Antennae with 11 segments and a 3 -segmented club, mandibles with 4 to 5 teeth, propodeum with spines, petiole with ventrally bifurcated carinae and postpetiole with ventrally posterior process.

Ochetomyrmex closely resembles Wasmannia. Wasmannia presents a roughly striated promesonotum, inconspicuous metanotal groove, elongated propodeal spines, inconspicuous bulla of the metapleural gland and a petiole lacking bifurcated carinae.

Keys to Species in this Genus

Distribution

Ochetomyrmex is restricted to South America, ranging in lowland tropical forests east of the Andes and nesting in leaf- litter.

World distribution based on political regions. View/Edit Data
Ochetomyrmex 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

Ochetomyrmex Species Richness.png

Biology

Castes

Morphology

Worker Morphology

 • Antennal segment count 11 • Antennal club 3 • Palp formula 3,2 • Spur formula 0, 0 • Sting present

Male Morphology

 • Antennal segment count 13 • Antennal club 0 • Palp formula 3,2 • Total dental count 4 • Spur formula 0, 0

Nomenclature

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

  • OCHETOMYRMEX [Myrmicinae: Formicoxenini]
    • Ochetomyrmex Mayr, 1878: 871. Type-species: Ochetomyrmex semipolitus, by monotypy.
    • Ochetomyrmex senior synonym of Brownidris: Kempf, 1975c: 355.
  • BROWNIDRIS [junior synonym of Ochetomyrmex]
    • Brownidris Kusnezov, 1956: 25 (diagnosis in key). Type-species: Brownidris argentinus, by original designation.
    • [Brownidris also described as new by Kusnezov, 1957a: 275.]
    • Brownidris junior synonym of Ochetomyrmex: Kempf, 1975c: 355; Bolton, 1994: 106.
    • [Brownidris retained as genus: Wheeler, G.C. & Wheeler, J. 1985: 257 (anachronism); Dlussky & Fedoseeva, 1988: 80 (anachronism)].

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

Description

Fernández, 2003. Figure 1.

Fernández (2003):

Worker

Monomorphic. Mandibles with four to five teeth. Palpal formula 3.2. Median portion of clypeus gently convex. Antennae 11-segmented with 3-segmented club. Compound eyes well developed, multifaceted, with angular inferior orbits, situated slightly behind the mid-length of head. Head without antennal scrobes. Mesosoma with promesonotum and propodeum separated by the metanotal groove in lateral view. Propodeum with spines. Propodeal spiracles round, large, conspicuous. Bulla of metapleural gland large and bulging, with dorsal margin approaching propodeal spiracle. Petiole with differentiated peduncle and node. Petiolar spiracle situated at midway between propodeal lobes and node. Petiole with dentiform ventral process. Petiole ventrally with median carina that diverges posteriorly. Workers smooth to finely sculptured, sparsely to moderately hairy.

Queen

Larger than worker, length around 8 mm. Masticatory border of mandible with a well-developed apical and subapical tooth only. Basal tooth inconspicuous. Palpal formula 4,3. Median portion of clypeus anteriorly subtruncated with a denticle in each corner. Front wing with open marginal cell. Petiolar spiracle situated in front of the mid-length of the peduncle. Postpetiole broadly attached to the gaster. Dorsal pilosity short and dense.

Male

Size: Total length about 7 mm. Mandibles with 3 to 4 teeth. Clypeus strongly bulging medially. Mandibles subtriangular with four teeth, apices slightly overlapping when closed. Petiole lacking both subpetiolar process and a ventrally bifurcated carina.

References

  • 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, Ochetomyrmex in Myrmicinae, Tetramoriini)
  • Bolton, B. 1994. Identification guide to the ant genera of the world. Cambridge, Mass.: Harvard University Press, 222 pp. (page 106, Ochetomyrmex in Myrmicinae, Ochetomyrmecini)
  • Bolton, B. 2003. Synopsis and Classification of Formicidae. Mem. Am. Entomol. Inst. 71: 370pp (page 10, Ochetomyrmex in Myrmicinae, Formicoxeni)
  • Dalla Torre, K. W. von. 1893. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. Vol. 7. Formicidae (Heterogyna). Leipzig: W. Engelmann, 289 pp. (page 135, Ochetomyrmex 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 80, Ochetomyrmex in Myrmicinae, Ochetomyrmecini)
  • Emery, C. 1895l. Die Gattung Dorylus Fab. und die systematische Eintheilung der Formiciden. Zool. Jahrb. Abt. Syst. Geogr. Biol. Tiere 8: 685-778 (page 770, Ochetomyrmex in Myrmicinae, Attini)
  • Emery, C. 1914e. Intorno alla classificazione dei Myrmicinae. Rend. Sess. R. Accad. Sci. Ist. Bologna Cl. Sci. Fis. (n.s.) 18: 29-42 (page 42, Ochetomyrmex in Myrmicinae, Ochetomyrmecini)
  • Emery, C. 1924f [1922]. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [concl.]. Genera Insectorum 174C: 207-397 (page 293, Ochetomyrmex in Myrmicinae, Ochetomyrmecini)
  • Fernández, F. 2003h. Myrmicine ants of the genera Ochetomyrmex and Tranopelta (Hymenoptera: Formicidae). Sociobiology 41:633-661.
  • Forel, A. 1895b. A fauna das formigas do Brazil. Bol. Mus. Para. Hist. Nat. Ethnogr. 1: 89-139 (page 126, Ochetomyrmex in Myrmicinae, Myrmicini)
  • Forel, A. 1917. Cadre synoptique actuel de la faune universelle des fourmis. Bull. Soc. Vaudoise Sci. Nat. 51: 229-253 (page 245, Ochetomyrmex in Myrmicinae, Ochetomyrmecini)
  • Jaffe, K. 1993. El mundo de las hormigas. Baruta, Venezuela: Equinoccio (Ediciones de la Universidad Simón Bolívar), 188 pp. (page 10, Ochetomyrmex in Myrmicinae, Solenopsidini)
  • Kempf, W. W. 1975c. Miscellaneous studies on neotropical ants. VI. (Hymenoptera, Formicidae). Stud. Entomol. 18: 341-380 (page 355, Ochetomyrmex senior synonym of Brownidris, and review of genus)
  • Kempf, W. W. 1975c. Miscellaneous studies on neotropical ants. VI. (Hymenoptera, Formicidae). Stud. Entomol. 18: 341-380 (page 358, Ochetomyrmex in Myrmicinae, Solenopsidini)
  • Mayr, G. 1878. Formiciden. Gesammelt in Brasilien von Professor Trail. Verhandlungen der k.k. Zoologisch-Botanischen Gesellschaft in Wien 27 (1877): 867-878. [(31.xii).1878.] PDF (page 871, Ochetomyrmex as genus)
  • Meurer, E., Battirola, L.D., Marques, M.I. & Delabie, J.H.C. 2015. New records and distribution for the Neotropical ant genus Ochetomyrmex Mayr (Hymenoptera: Formicidae). Sociobiology 62(2): 266-269.
  • Wheeler, G. C.; Wheeler, J. 1991a. The larva of Blepharidatta (Hymenoptera: Formicidae). J. N. Y. Entomol. Soc. 99: 132-137 (page 133, Ochetomyrmex in Myrmicinae, Solenopsidini)
  • Wheeler, W. M. 1910b. Ants: their structure, development and behavior. New York: Columbia University Press, xxv + 663 pp. (page 141, Ochetomyrmex in Myrmicinae, Tetramoriini)
  • 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 664, Ochetomyrmex in Myrmicinae, Ochetomyrmecini)