Novomessor cockerelli

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Novomessor cockerelli
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Stenammini
Genus: Novomessor
Species: N. cockerelli
Binomial name
Novomessor cockerelli
(André, 1893)

Aphaenogaster cockerelli castype00622 profile 1.jpg

Aphaenogaster cockerelli castype00622 dorsal 1.jpg

Specimen Label

Synonyms

A common and abundant species in some parts of its range, and the most common member of the genus in New Mexico. Nests are usually found in the soil with the entrance surrounded by a circle of pebbles with a diameter of about 50 cms. Even nests under stones usually have the entrance surrounded by pebbles. Most nests are found in rocky soil, although they may nest in sandy soils, even dunes. Individual foragers are usually found during early morning and late afternoon or evening, and occasionally during the night. Foraging occurs throughout the day during the cool part of the year or even on cloudy days during the summer. These ants are omnivorous. Prey usually consists of dead or dying insects, parts of plants and seeds. This species is very aggressive, but cannot sting; the bite is very fastidious when large numbers are attacking.

Identification

This ant is easily distinguished, as it is a large, elongate species with long legs and two well-developed spines on the propodeum. The metanotal suture is poorly marked on the dorsum of the mesosoma. Its elongate head usually distinguishes it from the closely related Novomessor albisetosus, although the two species can be difficult to separate. It can be easily separated from the similar Mexican species, Novomessor ensifer, by the lack of the constricted neck.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Nearctic Region: United States.
Neotropical Region: Mexico (type locality).


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Known from habitats including Creosotebush scrub, the most arid of habitats, fluff grass, open areas with annuals, usually at elevations below 1500 m.

Nests are usually found in the soil with the entrance surrounded by a circle of pebbles. Even nests under stones usually have the entrance surrounded by pebbles. Most nests are found in rocky soil, although they may nest in sandy soils, even dunes. Individual foragers are usually found during early morning and late afternoon or evening, and occasionally during the night. Foraging occurs throughout the day during the cool part of the year or even on cloudy days during the summer. These ants are omnivorous. Prey usually consists of dead or dying insects, parts of plants and seeds. This species is very aggressive but cannot sting. (Mackay and Mackay 2002)

Wheeler and Wheeler (1986) summarized previous published accounts about the biology of these ants:

"In the dry deserts of western Texas, I have seen ... cockerelli bring its larvae and pupae out onto the large crater of the nest about 9 P.M. and carry them leisurely to and fro" (W.M. Wheeler, 1910:69). He also (1910:178) saw straggling workers "returning from all directions to their nests just as the cold December twilight was setting in. Each worker bore in her slender jaws a fellow worker that she had picked up while on her way home.

"It is unlikely that anyone who has seen the nests of these insects could have failed to be impressed with their extraordinary coarseness of construction. There is not a single feature of the nest which does not appear abnormally large in view of the size of the insects themselves. The irregular central opening of the nest may be three or four inches across. Through this one looks down into a steeply descending, roughly constructed tunnel which more nearly resembles a rat's burrow than the entrance to an ant's nest. Around the central opening the insects ordinarily build a disc of very coarse gravel mixed with excavated soil. This disc may be six feet in diameter.... Toward the center of the disc there is often a thicker pile of soil and gravel which has been formed into a rude crater" (Wheeler and Creighton, 1934:346-347).

"There is little structural modification and practically no trophic adaptation which would mark them as well developed xerophiles" (Wheeler and Creighton, 1934:344).

"During the summer months the foraging activities of these insects begin late in the afternoon and continue through the night hours.... As a rule by the middle of the morning the workers have returned to the nest where they remain during the midday hours. When foraging the workers do not form files. Each stalks slowly about in a deliberate manner, which gives it a ludicrous air of bland solemnity. It may be doubted if these insects are capable of quick movement since, even when disturbed, their best efforts at speed are neither rapid nor sustained. The workers show no particular preference for seeds since, in addition to these, they gather small bits of plant tissue, pieces of fruit, and the disarticulated parts of insects. The latter are probably secured from insects which are dead or in a moribund condition since the slow movements ... would scarcely permit successful predatism. Little if any of the various substances brought into the nest are stored there" (Wheeler and Creighton, 1934:346-347).

Nevada, Wheeler and Wheeler (1986) - We have 10 records from 7 localities. All are in the Hot Desert in the southern tip of the state. Nest entrances huge and irregular, 12-50 mm across and surrounded by a disc or low crater or half-crater of gravel about 60 cm in diameter (see Fig. 22). Workers bit but did not sting. R.C. Bechtel collected nymphs of Arenivaga sp. (Orthoptera: Polyphagidae) at Searchlight (Clark Co.) in a nest.

Blind Snakes

A blind snake found in Texas by Alex Wild.

Ted Pavlic reports that he finds the Texas blind snake, Leptotyphlops dulcis, while evacuating Novomessor cockerelli nests in Arizona. Although the Novomessor are pretty good at defending and evicting some pretty terrible invaders, like giant centipedes, and although they evacuate when other blind predators, like Neivamyrmex, invade, they don't seem to mind the blind snakes at all. Another colleague says she has seen them in Pogonomyrmex nests as well.

Castes

Worker

Nomenclature

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

  • cockerelli. Aphaenogaster (Ischnomyrmex) cockerelli André, 1893b: 150 (w.) MEXICO. Wheeler, W.M. & Creighton, 1934: 350 (q.m.); Wheeler, G.C. & Wheeler, J. 1960b: 10 (l.). Combination in Stenamma (Ischnomyrmex): Forel, 1901c: 128; in Novomessor: Emery, 1915d: 73; in Aphaenogaster: Brown, 1974b: 47; in Novomessor: Demarco & Cognato, 2015: 5. Senior synonym of sonorae: Wheeler, W.M. & Creighton, 1934: 352. See also: Wheeler, G.C. & Wheeler, J. 1972b: 239; Hölldobler, Stanton & Engel, 1976: 32; Hölldobler, Stanton & Markl, 1978: 163; Smith, D.R. 1979: 1360; Bolton, 1982: 340.
  • sonorae. Aphaenogaster sonorae Pergande, 1893: 34 (w.) MEXICO. Combination in Novomessor: Emery, 1915d: 73. Junior synonym of cockerelli: Wheeler, W.M. & Creighton, 1934: 352.

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

Description

Andre 1893. Page 150.
Andre 1893. Page 151.

References

  • André, E. 1893b. Description de quatre espèces nouvelles de fourmis d'Amérique. Rev. Entomol. (Caen) 12: 148-152 PDF (page 150, worker described)
  • 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.
  • Brown, W. L., Jr. 1974b. Novomessor manni a synonym of Aphaenogaster ensifera (Hymenoptera: Formicidae). Entomol. News 85: 45-47 (page 47, Combination in Aphaenogaster)
  • Demarco, B.B. & Cognato, A.I. 2015. Phylogenetic analysis of Aphaenogaster supports the resurrection of Novomessor (Hymenoptera: Formicidae). Annals of the Entomological Society of America 1–10 (doi:10.1093/aesa/sau013).
  • Emery, C. 1915k. Definizione del genere Aphaenogaster e partizione di esso in sottogeneri. Parapheidole e Novomessor nn. gg. Rend. Sess. R. Accad. Sci. Ist. Bologna Cl. Sci. Fis. (n.s.) 19: 67-75 (page 73, Combination in Novomessor)
  • Forel, A. 1901d. I. Fourmis mexicaines récoltées par M. le professeur W.-M. Wheeler. II. A propos de la classification des fourmis. Ann. Soc. Entomol. Belg. 45: 123-141 (page 128, Combination in Stenamma (Ischnomyrmex))
  • Hölldobler, B.; Stanton, R. C.; Engel, H. 1976. A new exocrine gland in Novomessor (Hymenoptera: Formicidae) and its possible significance as a taxonomic character. Psyche (Camb.) 83: 32-41.
  • Hölldobler, B.; Stanton, R. C.; Markl, H. 1978. Recruitment and food-retrieving behavior in Novomessor (Formicidae, Hymenoptera). I. Chemical signals. Behav. Ecol. Sociobiol. 4: 163-181.
  • Mackay, W. P. and E. Mackay. 2002. The ants of New Mexico (Hymenoptera: Formicidae). Edwin Mellen Press, Lewiston, NY.
  • Smith A.A., Hoelldobler B. and Liebig J. 2008. Hydrocarbon signals explain the pattern of worker and egg policing in the ant Aphaenogaster cockerelli. J. Chem. Ecol. 34: 1275-1282
  • Smith A.A., Hoelldobler B. and Liebig J. 2009. Cuticular hydrocarbons reliably identify cheaters and allow enforcement of altruism in a social insect. Curr. Biol. 19: 78-81 (Cuticular Hydrocarbons)
  • 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 Pr.
  • Wheeler, G. C.; Wheeler, J. 1960b. Supplementary studies on the larvae of the Myrmicinae (Hymenoptera: Formicidae). Proc. Entomol. Soc. Wash. 62: 1-32 (page 10, larva described)
  • Wheeler, G. C.; Wheeler, J. 1972b. Ant larvae of the subfamily Myrmicinae: second supplement on the tribes Myrmicini and Pheidolini. J. Ga. Entomol. Soc. 7: 233-246.
  • Wheeler, G. C. and J. Wheeler. 1986. The ants of Nevada. Natural History Museum of Los Angeles County, Los Angeles.
  • Wheeler, W. M.; Creighton, W. S. 1934. A study of the ant genera Novomessor and Veromessor. Proc. Am. Acad. Arts Sci. 69: 341-387 (page 350, queen, male described, page 352, Senior synonym of sonorae)