Platythyrea punctata

(Smith, 1858)

Common Silvery Hunter Ant

Platythyrea punctata is a neotropical distinguished by its remarkable reproductive flexibility. Most reproduce through , where unmated produce female offspring from unfertilized , resulting in colonies with clonal genetic structure. The species also exhibits facultative , with occasional queens, gamergates (mated reproductive workers), and males appearing in some populations. This combination of alternative reproductive tactics is unique among ants and has made the species a model for studying social evolution, division of labor, and the transition between sexual and .

Platythyrea punctata casent0103910 dorsal 1 by April Nobile. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Platythyrea punctata: /ˌplætɪˈθaɪriə pʌŋkˈteɪtə/

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Distribution

Neotropical region. Documented from Florida (USA), Barbados, Puerto Rico, Rica, Brazil (Amazonas, Pará), and the Dominican Republic. show geographic variation in reproductive mode: queens absent from Barbados and Puerto Rico colonies but present in 29% of Florida colonies.

Life Cycle

exhibit delayed maturation of the and muscle fibers. Young workers remain within the nest during an intranidal period, during which the and thoracic muscle fibers thicken significantly. Final maturation occurs in forager individuals. Workers transitioning to outside tasks at younger ages show reduced longevity compared to those beginning to forage later in life.

Behavior

Colonies are primarily , with most activity during daylight hours and few observed outside nests at night. Workers display age-based : young individuals perform care and show higher levels of aggressive , while older workers spend more time outside the nest and . Brood care and aggression decrease with age. In queenless colonies, reproductive form through physical aggression and ritualized interactions, with typically one worker monopolizing despite multiple individuals potentially having developed ovaries. Policing behavior maintains reproductive suppression of subordinates by individuals.

More Details

Reproductive Biology

The exhibits three distinct reproductive morphs: queens ( and dealate), gamergates (mated reproductive ), and thelytokous parthenogenetic workers. Intercastes—individuals with intermediate between workers and queens—have been documented (66 individuals in 16 Florida colonies). In some Rican , uninseminated workers appear incapable of thelytokous , representing a geographic shift toward obligate .

Genetic Structure

Microsatellite analysis reveals extremely low intraspecific genetic variation and almost no differentiation within . Colonies typically show clonal structure with all nestmates sharing identical multilocus , reflecting the predominance of thelytoky combined with genetic bottlenecks and founder effects. Occasional colonies show genetic variability indicating , adoption of , or during .

Physiological Trade-offs

Reproductive status influences resource allocation: -laying individuals show reduced muscle fiber development compared to non-reproductive , suggesting metabolic costs are minimized in reproductives to support egg production. This demonstrates how eusociality alters selection pressures and results in temporal shifts in individual development to optimize colony-level resource allocation.