Myrmecophilus

Berthold, 1827

ant crickets

Species Guides

5

Myrmecophilus is a of minute crickets commonly known as ant crickets, containing the majority of in the Myrmecophilidae. These insects are obligate myrmecophiles, living exclusively within colonies. Species vary in size from less than 1.5 mm to 4.7 mm, generally correlating with the body size of their ant species. The genus has a worldwide distribution with numerous described species across Europe, Asia, North America, and other regions.

Myrmecophilus nebrascensis by (c) Jared Shorma, some rights reserved (CC BY), uploaded by Jared Shorma. Used under a CC-BY license.Myrmecophilus oregonensis by (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda. Used under a CC-BY license.Myrmecophilus oregonensis by (c) Cricket Raspet, some rights reserved (CC BY), uploaded by Cricket Raspet. Used under a CC-BY license.

Pronunciation

How to pronounce Myrmecophilus: //mɪərˈmiːkəfɪləs//

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Identification

Distinguished from other orthopterans by the combination of: extremely small size (under 5 mm), complete absence of wings, reduced or absent with no ocelli, long filamentous , and enlarged covered in sensory setae. The wingless condition and reduction separate Myrmecophilus from most other crickets. Found exclusively in association with ants; free-living individuals outside nests are exceptional occurrences. -level identification requires examination of male genitalia and comparison with .

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Habitat

Obligate inhabitants of nests, including subterranean chambers, cavities under stones, and galleries within dead wood. Recorded from nests of various ant including Camponotus, Crematogaster, Lepisiota, and others. Some occupy arboreal ant nests. span open scrubland, pine forests, and other environments where ants occur.

Distribution

Worldwide distribution with records from Europe (including northern latitudes in Latvia), Asia (Middle Asia, China, Malesia, Afghanistan), North America (eastern and western United States, southern Canada), Australia, and other regions. Specific have more restricted ranges: M. pergandei occurs from Maryland to Florida and west to Texas; M. oregonensis ranges from southern British Columbia through Oregon, Washington, and California; M. acervorum has expanded its known range northward with recent records from Latvia representing the northernmost observations.

Diet

Has been observed actively licking ants and the walls of underground nests, presumably feeding on oily secretions from ant . The precise nutritional requirements and whether additional food sources are utilized remain incompletely documented.

Host Associations

  • Camponotus - of some found in nests of large Camponotus species
  • Crematogaster - Juveniles of some recorded from nests of small Crematogaster species
  • Lepisiota - Juveniles of some recorded from nests of small Lepisiota species
  • Tetramorium - for M. tetramorii

Life Cycle

Development includes , nymph, and stages. Some appear to change species during ontogeny: juveniles in nests of small ant species, adults in nests of larger ant species. may occur in some ; males are rare or absent in some northern European populations of M. acervorum.

Behavior

Highly agile, capable of rapid running to escape aggression. Uses oversized with sensory hairs to detect air currents generated by approaching ants or other threats. Has been observed actively licking ants and nest substrate. Ants typically tolerate but may attack or kill crickets; crickets demonstrate remarkable escape capabilities. Some exhibit switching escape strategies depending on threat context.

Ecological Role

Myrmecophilous living as commensals or within colonies. May impose minor energetic costs on colonies through consumption of ant secretions and occasional by ants. linked to host ant colony health and size.

Human Relevance

Occasional accidental occurrence in human dwellings when nests are nearby. Not considered pests; ants may regard them as minor nuisances within colonies. Of scientific interest for studying myrmecophily and - .

Similar Taxa

More Details

Morphological adaptation to host specificity

Research on four Myrmecophilus indicates that morphological characteristics, particularly body size and proportions, reflect both food sources and degree of specificity. Crickets associated with different host ant species show corresponding morphological divergence.

Cryptic speciation

Intraspecific diversity in M. acervorum suggests ongoing cryptic speciation, with genetically distinct lineages potentially representing unrecognized .

Parthenogenesis

Some , particularly at northern range limits, appear to reproduce parthenogenetically with extremely rare or absent males. Historical male records from the Pomeranian Lakeland are now considered uncertain.

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