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Myrmicinae
Myrmicinae
Myrmicinae
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Myrmicinae
Temporal range: Turonian–Recent
Atta cephalotes
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Lepeletier de Saint-Fargeau, 1835
Type genus
Myrmica
Latreiile, 1804
Diversity[1]
142 genera

Myrmicinae is a subfamily of ants, with about 140 extant genera;[1] their distribution is cosmopolitan. The pupae lack cocoons. Some species retain a functional sting. The petioles of Myrmicinae consist of two nodes. The nests are permanent and in soil, rotting wood, under stones, or in trees.[2] All species of Cephalotes (within the tribe Attini) are gliding ants.

Identification

[edit]

Myrmicine worker ants have a distinct postpetiole, i.e., abdominal segment III is notably smaller than segment IV and set off from it by a well-developed constriction; the pronotum is inflexibly fused to the rest of the mesosoma, such that the promesonotal suture is weakly impressed or absent, and a functional sting is usually present. The clypeus is well-developed; as a result, the antennal sockets are well separated from the anterior margin of the head. Most myrmicine genera possess well-developed eyes and frontal lobes that partly conceal the antennal insertions.[3]

Tribes

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Recently, the number of tribes was reduced from 25 to six:[4]

Genera

[edit]

In 2014, most genera were placed into different tribes or moved to other subfamilies. Below is an updated list:[1][4]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Myrmicinae

View on Grokipedia
from Grokipedia
Myrmicinae is a large and diverse of within the family Formicidae, distinguished morphologically by a two-segmented (pedicel) consisting of a petiole and postpetiole, as well as a functional sting derived from a modified . It represents the most -rich group of , encompassing approximately 7,138 valid extant classified into around 155 genera. Myrmicines exhibit a , occurring in nearly all terrestrial habitats worldwide except the polar extremes, with particularly high diversity in tropical regions such as the Neotropics and Paleotropics. Ecologically, the subfamily is highly versatile, including omnivorous generalists, specialized predators, , seed-harvesting granivores, and advanced fungus-cultivating species like the leaf-cutting of the tribe Attini. Their behaviors, nesting strategies, and organizations vary widely, from solitary foragers to massive polydomous societies, contributing significantly to ecosystem processes such as soil aeration, , and nutrient cycling. Taxonomically, Myrmicinae is divided into six major tribes—Myrmicini, Pogonomyrmecini, Stenammini, Solenopsidini, Attini, and Crematogastrini—reflecting a complex evolutionary history that originated in the Late Cretaceous around 99 million years ago, with subsequent radiations driven by biogeographic shifts and ecological adaptations. Notable genera include the invasive fire ants (Solenopsis), big-headed ants (Pheidole), and acrobat ants (Crematogaster), many of which play prominent roles in both natural and human-altered environments. The subfamily's hyperdiversity underscores its evolutionary success, accounting for roughly half of all described ant species.

Description and Identification

Physical Characteristics

Myrmicinae exhibit the typical hymenopteran , consisting of three main tagmata: the head, mesosoma (which includes the thorax and first abdominal segment), and gaster (the remaining abdominal segments). The waist between the mesosoma and gaster is characteristically two-segmented, formed by a petiole and a postpetiole, which distinguishes this subfamily morphologically. Workers in Myrmicinae typically possess 12-segmented antennae featuring an elbowed base and a three-segmented apical club, aiding in sensory functions such as and communication. Pupae are naked and exposed, lacking the protective cocoons found in some other subfamilies, which exposes them to environmental conditions and nestmate care during development. A functional sting is present in most genera, serving primarily for defense against predators and competitors, as well as subduing prey. Worker size varies widely across the subfamily, ranging from approximately 1 mm to 14 mm in length, with differences influenced by genus and environmental factors. is pronounced, with generally larger than workers and equipped with functional wings for nuptial flights, large compound eyes, and ocelli, while males are often smaller overall, featuring reduced head size relative to body proportions and also possessing wings. Tribal variations in morphology, such as spine development or body sculpturing, further diversify these general features.

Diagnostic Features

Myrmicinae are distinguished from other primarily by their two-segmented , consisting of a petiole and a distinct postpetiole that is node-like and separate from the gaster, rather than fused directly to it. This postpetiole is a key apomorphy, present in all myrmicines and rare outside the , providing a reliable identifier even in highly modified species. The petiole itself exhibits complete tergosternal fusion, further characterizing the structure. In workers, the pronotum is fused with the mesonotum to form a single promesonotal plate, with the suture weakly impressed or absent, contributing to the rigid mesosoma typical of the subfamily. The clypeus is well-developed and carinate, often with its median portion projecting posteriorly between the antennal sockets, effectively concealing the antennal insertions beneath well-formed frontal lobes. Antennal sockets are typically not strongly lateralized, and the antennae themselves are geniculate with a three-segmented club in most species. Eyes are present and conspicuous in the majority of workers, usually positioned anteriorly on the head sides with multiple ommatidia, though reduced or absent in a few subterranean or specialized taxa. Mandibles are generally triangular in shape, armed with 4-6 teeth along the masticatory margin, though elongate and edentate forms occur in certain genera without inner margin teeth. The propodeum commonly bears spines, teeth, or rounded lobes, often paired and directed posteriorly, adding to the subfamily's morphological diversity. Identification of Myrmicinae can sometimes overlap with Dolichoderinae in tropical forms where the petiole appears constricted, but this is resolved by confirming the presence of a true postpetiole in myrmicines versus a single, non-segmented petiolar node in dolichoderines.

Taxonomy and Phylogeny

Classification History

The subfamily Myrmicinae was first established by Lepeletier de Saint-Fargeau in 1835 within the family Formicidae, encompassing a broad array of ant species characterized by morphological features such as the structure of the petiole and postpetiole. In the 1840s, John Obadiah Westwood advanced early classifications by describing key genera like Carebara and integrating them into the subfamily, laying foundational work for subsequent taxonomic efforts based on limited morphological data. During the 20th century, classifications expanded significantly, with Carlo Emery's seminal work in recognizing 25 tribes within Myrmicinae, relying heavily on morphological traits such as antennal segmentation and mandibular structure to delineate groups. This system, refined in Emery's 1922 publication, dominated for decades but often resulted in artificial groupings due to in unrelated lineages. A major shift occurred in 2014 when Ward et al. utilized molecular phylogenetic analyses of 11 nuclear genes across 251 species to revise the subfamily, reducing the number of tribes to six—Myrmicini, Pogonomyrmecini, Stenammini, Solenopsidini, Attini, and Crematogastrini—by consolidating smaller, polyphyletic groups into monophyletic ones. This revision highlighted the limitations of prior morphology-based systems, which had overemphasized superficial traits and led to numerous non-monophyletic tribes, such as those splitting convergent foraging forms. Barry Bolton's ongoing catalogs further documented the growing diversity, listing approximately 100 genera in Myrmicinae in his 1994 identification guide and expanding to over 140 by 2024 through descriptions of new taxa and synonymies, reflecting continued morphological and molecular refinements. These updates underscored persistent gaps in pre-molecular , where polyphyletic assemblages persisted until integrative approaches resolved longstanding ambiguities.

Current Tribes

As of 2025, the subfamily Myrmicinae is classified into six tribes, a framework supported by phylogenomic analyses that provide robust molecular evidence for their , though relationships among some tribes remain sensitive to sampling density. This classification reflects a consolidation from earlier, more fragmented tribal arrangements. The tribe Attini, comprising approximately 250 across 20 genera, is characterized by its obligate fungus-culturing behavior, including well-known leaf-cutter in genera such as Atta and Acromyrmex; it is exclusively distributed in the , with a focus on Neotropical regions. Crematogastrini is the most species-rich tribe, with over 2,000 in roughly 60 genera, encompassing a wide array of forms from arboreal nesters like to ground-dwelling generalists; its members exhibit cosmopolitan distributions and diverse nesting strategies. The tribe Myrmicini, containing around 220 species primarily in genera such as Myrmica and Manica, features ants with reduced eyes and temperate adaptations; recent 2025 phylogenomic work has clarified internal relationships within this predominantly Holarctic group. Pogonomyrmecini, with approximately 100 species in several genera including Pogonomyrmex, consists of seed-harvesting specialists often equipped with powerful mandibles, some exhibiting trap-jaw mechanisms; this tribe is largely confined to Asian and American arid zones. Solenopsidini includes about 1,000 across 20+ genera, notably the fire ants of Solenopsis, known for their aggressive stings and invasive potential; the tribe has a cosmopolitan range, with significant diversity in tropical and subtropical areas. Finally, Stenammini, encompassing roughly 500 in 7 genera like Stenamma and Messor, is adapted to arid environments with seed-collecting habits; it shows a strong focus on the , particularly Mediterranean and African regions.

Genera

Myrmicinae encompasses 155 extant genera and 42 genera, reflecting its status as the most diverse according to Barry Bolton's comprehensive catalog. These genera are distributed across six recognized tribes, with tribal affiliations providing key taxonomic structure as outlined in recent phylogenetic analyses. The distribution of genera varies markedly by tribe, with Crematogastrini exhibiting the highest diversity at over 65 genera, encompassing a wide array of ecological roles from arboreal to soil-dwelling forms. In contrast, Pogonomyrmecini represents the least diverse tribe, containing only 5 genera primarily adapted to arid environments. Among the notable genera, Atta stands out for its leaf-cutting behavior, comprising 15 species that cultivate symbiotic fungi in Neotropical forests. Solenopsis, known as fire ants, includes over 200 species renowned for their invasive potential and stinging defense. Tetramorium is a widespread genus with more than 600 species, occupying diverse habitats from temperate grasslands to tropical soils. Similarly, Myrmica features around 200 species, predominantly in temperate regions where they form aggressive colonies in leaf litter and soil. Despite these advances, coverage remains incomplete, particularly in tropical regions where an estimated 20% more Myrmicinae genera await description due to ongoing discoveries in biodiverse hotspots like Southeast Asia and the Neotropics.

Distribution and Biogeography

Global Range

Myrmicinae represents one of the most widespread ant subfamilies, occurring on all continents except Antarctica and spanning diverse habitats from tropical rainforests to temperate zones. With approximately 7,138 valid extant species across 155 genera, the subfamily achieves its highest diversity in tropical regions, where environmental conditions favor speciation and ecological specialization. This cosmopolitan distribution underscores Myrmicinae's adaptability, though polar extremes remain uninhabited due to physiological constraints on cold tolerance. Regionally, the Neotropics host the greatest concentration of Myrmicinae species, accounting for a substantial portion of global diversity—approximately 51% of all ant species in the region belong to this subfamily, driven by hyperdiverse tribes like Attini. The Afrotropics follow with significant richness, exemplified by high genus counts in countries like the Democratic Republic of Congo, where Myrmicinae contributes prominently to the 736 recorded ant . The Oriental and Australasian realms, along with the Palearctic and Nearctic regions, exhibit lower diversity due to reduced tropical influence. These patterns reflect historical biogeographic processes, with Paleotropical diversification dominating much of the evolutionary . Several Myrmicinae species have become highly invasive through human-mediated introductions, expanding beyond native ranges and altering local ecosystems. A prominent example is Solenopsis invicta, the , native to South America's region but now established in the , , and parts of and , where it forms dense populations in disturbed areas. Biogeographic analyses reveal distinct origins for major tribes: the Attini, a basal group with over 250 species of fungus-farming , traces to Neotropical (Gondwanan) lineages, while the Myrmicini exhibit Laurasian (Holarctic) roots, with subsequent radiations into temperate zones. By , ongoing range expansions are evident, particularly for , as warming climates enable poleward shifts and human transport vectors like shipping continue to bridge biogeographic barriers, potentially increasing overlap between realms.

Habitat Preferences

Myrmicinae exhibit a wide range of habitat preferences, reflecting the subfamily's ecological versatility across diverse environments. The majority of genera construct nests in , often comprising around 70% of known taxa, with colonies excavating chambers beneath stones, logs, or in open ground to access stable microclimates. Other common nest sites include rotten , leaf litter accumulations, and arboreal locations such as tree hollows or branches, particularly among tribes like Crematogastrini, where species such as have adapted to canopy living through specialized clinging behaviors and carton nests built from fibers. These varied nesting strategies allow Myrmicinae to exploit both terrestrial and vertical habitats, from ground level to forest canopies. Microhabitat selection within Myrmicinae is tribe-specific and tied to climatic conditions. For instance, the tribe Attini, including leaf-cutter ants like Atta and Acromyrmex, predominates in humid tropical forests of the Neotropics, where deep nests support extensive fungal gardens requiring consistent and . In contrast, species in the tribe Stenammini, such as Stenamma, favor mesic forest habitats in temperate and subtropical regions, nesting in leaf litter or shallow to maintain humidity in cooler, wooded environments. Temperate grasslands host genera like Myrmica, which nest in mounds or under vegetation, benefiting from open, grassy areas with moderate rainfall and seasonal fluctuations. Arid and semi-arid deserts are occupied by tribes such as Pogonomyrmecini, exemplified by Pogonomyrmex harvester ants, which construct large mounds in exposed, dry landscapes to capture sparse resources. Adaptations to these habitats enhance survival in challenging conditions. In desert species like those in Pogonomyrmecini and Solenopsidini, worker polymorphism—featuring castes—facilitates efficient resource handling; larger majors process seeds indoors to minimize water loss, while smaller minors quickly during brief activity windows, conserving and in hot, dry environments. Temperate Myrmicinae, such as Myrmica, exhibit seasonal nesting shifts, deepening soil chambers in winter for insulation against frost and relocating brood to warmer surface layers in spring to optimize development under varying temperatures. Urban adaptation is evident in genera like Monomorium, where such as the (M. pharaonis) thrive in human-modified settings by nesting in wall voids, insulation, or moist indoor areas, exploiting stable warmth and food availability. Habitat loss poses significant threats to Myrmicinae diversity, particularly in tropical regions where fragments forest habitats critical for arboreal and fungus-farming tribes like Attini and Crematogastrini, contributing to declines in . However, some genera demonstrate resilience, with urban-tolerant species like Monomorium expanding into cities, potentially offsetting local extinctions in natural habitats.

Ecology and Behavior

Social Structure and Nesting

Myrmicinae display a eusocial system consisting of reproductive queens, sterile female workers responsible for , nest maintenance, and defense, and winged males primarily involved in mating. In many species, workers exhibit , but polymorphism is common in advanced tribes, featuring distinct subcastes such as minors for and majors or s for defense; for instance, in the Attini tribe, soldier workers in genera like Atta are specialized for cutting and protecting the colony. Colony sizes in Myrmicinae vary widely, from dozens of individuals in primitive species with simple , such as certain Myrmecina, to millions of workers in highly advanced forms like Atta leaf-cutter ants, which form expansive supercolonies. Nesting behaviors typically involve excavating multi-chambered structures with interconnected galleries in , , or leaf litter to house brood and resources; in the Attini, nests are elaborate subterranean complexes centered on gardens, where workers cultivate symbiotic fungi using fresh material as substrate, with waste chambers for refuse management. Some species in the Crematogastrini tribe, such as , exhibit polydomy, occupying multiple interconnected nests to expand territory and enhance foraging efficiency. Reproduction in Myrmicinae generally occurs via synchronized nuptial flights, during which virgin mate with multiple males mid-air before shedding wings and founding new colonies claustrally—sealing themselves in a small chamber to provision the first brood from bodily reserves without external . Slave-making behaviors are rare but notable in certain genera like Harpagoxenus, where conduct raids on host colonies (often other Myrmicinae) to capture brood, which develops into enslaved workers essential for the parasite's colony survival and reproduction. Recent molecular studies from 2025 on such as Solenopsis invicta have revealed genetic supergenes controlling queen-worker dimorphism and social polymorphism, highlighting how environmental cues and influence differentiation and colony organization in non-native ranges.

Foraging and Interactions

Myrmicinae display a broad range of dietary preferences, reflecting their ecological versatility, with many species exhibiting omnivorous habits that include prey, seeds, , and honeydew from hemipterans. Predatory is prevalent in numerous genera, where workers capture and subdue live and other small , often using mandibular strikes or chemical immobilization to secure food for the colony. In contrast, seed-harvesting specialists like those in the genus Pogonomyrmex focus primarily on collecting and milling seeds, which serve as a staple resource, supplemented by opportunistic predation on during bouts. The tribe Attini represents a specialized dietary , where colonies cultivate symbiotic fungi ( spp.) as their main food source; foragers gather fresh plant material, such as leaves or flowers, to fertilize and propagate these fungal gardens, creating a highly efficient agricultural system unique among . Foraging strategies within Myrmicinae vary from solitary individual searches to coordinated group efforts, enabling efficient resource exploitation across diverse habitats. Solitary foraging predominates in many , such as Pogonomyrmex workers that venture out independently to locate within defined territories, returning to the nest with single loads while marking paths with trail pheromones to guide future trips. Trail pheromones, typically produced by the Dufour's or poison glands, play a crucial role in mass for genera like Atta and Acromyrmex, where initial scouts deposit chemical cues upon discovering rich food patches, prompting rapid influxes of workers to strip vegetation or harvest . Group raiding, reminiscent of tactics, occurs in swarm-raiding such as Pheidologeton diversus, where thousands of workers form expansive, fan-shaped columns to overwhelm and capture large prey or usurp resources from competitors, allowing colonies to harvest ephemeral food sources before rivals arrive. Ecological interactions among Myrmicinae are multifaceted, encompassing mutualisms, predation, and intense that shape community dynamics. Mutualistic relationships are exemplified by the obligate between Attini and their cultivated fungi, where provide substrate and protection in exchange for nutrient-rich fungal tissue, a partnership that has evolved to include antibiotic-producing (Pseudonocardia spp.) to defend gardens against pathogens. Some species, including Leptothorax, engage in facultative mutualism with , tending colonies for honeydew secretions while shielding them from predators, thereby securing a carbohydrate-rich diet. Predatory interactions extend to intra- and , as seen in Pogonomyrmex colonies that aggressively defend trails against intruders, leading to territorial exclusion and reduced overlap in resource use. Defense mechanisms bolster these interactions; Solenopsidini , such as the (Solenopsis invicta), deploy potent stings delivering alkaloids to repel threats or subdue prey during raids, while Myrmicini species like Myrmica rely on sprays from the poison gland for chemical deterrence against predators and competitors. Myrmicinae foraging has notable economic implications, balancing pest pressures with ecological services. Invasive fire ants (Solenopsis invicta) inflict substantial agricultural damage by preying on pests and , disrupting operations, and causing infrastructure failures through nesting, with annual U.S. costs exceeding $8 billion (as of 2025) in control and losses across infested regions. Conversely, seed-harvesting Myrmicinae contribute beneficially by aiding ; Pogonomyrmex species inadvertently disperse viable seeds through storage, where some germinate post-milling, enhancing seedling establishment and soil nutrient cycling in arid ecosystems, while broader predation reduces populations to support yields in natural settings.

Evolution and Diversity

Fossil Record

The fossil record of Myrmicinae begins in the Eocene epoch, with the earliest definitive representatives appearing around 50 million years ago (MYA) in amber deposits from and . Primitive myrmicines, such as those assigned to early genera like Eocenidris, are preserved in Middle Eocene sediments from and , showcasing basic morphological features like reduced wing venation and a sting apparatus typical of the subfamily. A significant diversification of Myrmicinae occurred during the Eocene (~56–34 MYA), coinciding with the radiation of angiosperm-dominated forests that provided new ecological niches for and nesting. This "Eocene explosion" is evidenced by diverse inclusions from Baltic, Rovno, and Saxonian sources, where myrmicines comprise a notable portion of , reflecting adaptations to humid, forested environments. Numerous have been described from these deposits, with over 200 Myrmicinae known in total across various deposits, spanning both modern and extinct lineages. Key fossils highlight specific evolutionary insights, such as specimens of the from (~15–20 MYA), including early species of Apterostigma like A. electropilosum, which confirm the origins of fungus-growing ants and their symbiotic associations predating modern forms. These inclusions preserve workers with fungal pellets, illustrating ancient agricultural behaviors. The fossil record of Myrmicinae remains patchy, particularly in the , where and early deposits yield few myrmicine remains compared to the abundant ambers. Recent studies in 2025 have employed micro-CT scans on amber inclusions to non-destructively analyze rare specimens, such as those in the Strumigenys group, revealing fine morphological details and addressing preservation gaps without physical . Approximately 36 extinct genera have been described within Myrmicinae, including Lelejus from late Eocene Rovno and others like Tyrannomyrmex from sites, many exhibiting morphological stasis in traits such as mandibular structure and body sclerotization relative to extant relatives.

Species Diversity and Adaptations

The subfamily Myrmicinae stands out for its extraordinary , encompassing over 6,700 valid and as documented in recent taxonomic catalogs. This accounts for nearly half of all described ant worldwide, underscoring the subfamilys dominance within the Formicidae. Diversity peaks in tropical regions, where habitat heterogeneity and stable climates promote and coexistence. Several key evolutionary adaptations have fueled this and ecological success. Within the tribe Attini, the development of fungivory represents a pivotal , with advanced agricultural systems—characterized by the cultivation of gardens using fresh vegetation—emerging approximately 25 million years ago, enabling these to exploit stable, nutrient-rich food sources independent of fluctuating prey availability. In contrast, species of the genus Solenopsis, such as the (S. invicta), exhibit heightened invasiveness through the formation of expansive supercolonies comprising billions of individuals across hundreds of square kilometers, facilitating aggressive territorial expansion and resource monopolization in disturbed habitats. Underlying these traits are broader drivers of diversification, including morphological plasticity that allows for extreme variations in body size (ranging from 1 mm to over 10 mm) and defensive structures like propodeal spines, which enhance survival in competitive environments. Complementing this is sophisticated chemical ecology, where pheromones mediate complex social behaviors such as trail-following and alarm signaling, while alkaloids provide potent tools for predation, defense, and microbial inhibition. Conservation challenges persist amid this richness, with 141 taxa classified as threatened on the , representing roughly 1% of all described ant species (as of 2025), a figure that includes numerous Myrmicinae due to their prevalence in human-modified landscapes. Undescribed diversity remains substantial, with estimates suggesting over 10,000 total species in the when accounting for cryptic forms in undersampled tropical areas. Recent phylogenomic analyses conducted in 2025 affirm that this hyperdiversity arose from rapid radiations in the aftermath of the Cretaceous-Paleogene , capitalizing on newly available ecological niches, with studies resolving tribal relationships such as the Paleotropical origins of Myrmicini.

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