Distribution Notes

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collected from the Chiricahua Mtns, Cochise Co.
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AntWeb. Version 8.45.1. California Academy of Science, online at https://www.antweb.org. Accessed 15 March 2021.
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Taxonomic History

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Acropyga epedana Snelling, 1973a PDF: 7, fig. 1 (w.) U.S.A. Nearctic. AntCat AntWiki HOL

Taxonomic history

LaPolla et al., 2002: 369 (q.m.).See also: LaPolla, 2004a PDF: 46.
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AntWeb. Version 8.45.1. California Academy of Science, online at https://www.antweb.org. Accessed 15 March 2021.
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Distribution

provided by Catalog of Hymenoptera in America North of Mexico
Ariz. (Montezuma Pass, 5800 ft., Huachuca Mts., Cochise Co.)
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Catalog of Hymenoptera in America North of Mexico. 1979. Prepared cooperatively by specialists on the various groups of Hymenoptera under the direction of Karl V. Krombein and Paul D. Hurd, Jr., Smithsonian Institution, and David R. Smith and B. D. Burks, Systematic Entomology Laboratory, Insect Identification and Beneficial Insect Introduction Institute. Science and Education Administration, United States Department of Agriculture.

General Ecology

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Specimens were found under a stone.
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bibliographic citation
Catalog of Hymenoptera in America North of Mexico. 1979. Prepared cooperatively by specialists on the various groups of Hymenoptera under the direction of Karl V. Krombein and Paul D. Hurd, Jr., Smithsonian Institution, and David R. Smith and B. D. Burks, Systematic Entomology Laboratory, Insect Identification and Beneficial Insect Introduction Institute. Science and Education Administration, United States Department of Agriculture.

Acropyga epedana

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Acropyga epedana is an ant in the subfamily Formicinae. It lives permanently underground in the Chiricahua Mountains in Arizona and forms a mutualistic association with the mealybug Rhizoecus colombiensis.

Description

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Head of worker

Acropyga epedana is a tiny pale golden-brown ant with a few erect hairs but many dense appressed hairs. The reproductives have normal compound eyes but the workers have tiny eyes and avoid exposure to light. These ants are very similar in appearance to Acropyga goeldii and Acropyga palaga and may be a northern population of A. goeldi. However, there are differences in the extensions to the penis valves that make it likely that the three are in fact separate species. The head of Acropyga epedana is smaller than that of the other two species. The total length of a worker is 1.75 mm (0.07 in).[1]

Distribution

Acropyga epedana is found in the Chiricahua Mountains in Arizona at elevations of between 1,050 and 1,700 metres (3,440 and 5,580 ft) and its range probably extends southwards into the Sierra Madre Occidental Mountains in Mexico. Because there is no sign of the nest above ground, this ant may be under recorded. It is generally found in woodland of juniper and oak.[1]

Biology

Colonies of Acropyga epedana are completely subterranean. Nests have been found under boulders and consist of galleries and chambers that may extend to 30 centimetres (12 in) or more underground, and perhaps deeper in the dry season. This species has an obligate trophobiotic relationship with the mealybug, Rhizoecus colombiensis. This underground sap-sucking insect feeds on the roots of plants and the ants herd them and feed on the honeydew they produce. The ants are believed to obtain all their nourishment from this source, and in a laboratory experiment, when they were deprived of their mealybugs, they refused all other forms of food that they were offered.[2] The mealybugs are found clustered on roots in deeper parts of the nest in the passages excavated by the ants. Many of the ants are infested with parasitic mites.[3]

Flights of winged reproductive ants (alates) have been seen in mid-summer, shortly after the beginning of seasonal rains. There are often ten times as many male as female alates. Each female emerges from her natal nest carrying a mealybug between her mandibles, presumably to act as a parent of the mealybug herd in the nest she will found. The flying ants hover in a swarm and copulate in mid-air. The females return to the ground after their nuptial flights, each still carrying a mealybug, shed their wings, and search for a suitable site to make a new nest.[3] Some may join colonies in existing nests, as evidenced by the fact that there are often several queens in a nest.[3]

References

  1. ^ a b "Acropyga epedana". AntWiki. Retrieved 2013-11-27.
  2. ^ LaPolla, John S.; Cover, Stefan P.; Mueller, Ulrich G. (2002). "Natural History of the Mealybug-Tending Ant, Acropyga epedana, with Descriptions of the Male and Queen Castes". Transactions of the American Entomological Society. 128 (4): 367–376. JSTOR 25078787.
  3. ^ a b c Smith, Chris R.; Oettler, Jan; Kay, Adam; Deans, Carrie (2007). "First Recorded Mating Flight of the Hypogeic Ant, Acropyga epedana, with its Obligate Mutualist Mealybug, Rhizoecus colombiensis". Journal of Insect Science. 7 (11): 1. doi:10.1673/031.007.1101. PMC 2999416.

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Acropyga epedana: Brief Summary

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Acropyga epedana is an ant in the subfamily Formicinae. It lives permanently underground in the Chiricahua Mountains in Arizona and forms a mutualistic association with the mealybug Rhizoecus colombiensis.

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