Worker-polymorphism
Guides
Colobopsis obliqua
Oblique Gate-keeper Ant
Colobopsis obliqua is a species of ant in the subfamily Formicinae, first described by Smith in 1930. It belongs to a genus known for specialized defensive behaviors, including the 'exploding ant' phenomenon where minor workers rupture their bodies to release toxic secretions. The species is commonly referred to as the 'Oblique Gate-keeper Ant' due to the characteristic head shape of major workers used to block nest entrances.
Cyphomyrmex
fungus-growing ants
Cyphomyrmex is a genus of small, drab-colored fungus-growing ants in the tribe Attini, found primarily in the Neotropics. These ants cultivate fungi in the tribe Leucocoprineae as their primary food source, with most species growing fungal nodules rather than full mycelial gardens. Colonies are typically monogynous and small, rarely exceeding 500 workers. The genus is divided into two species complexes: the strigatus complex (South America only) and the rimosus complex (southern North America to South America). Cyphomyrmex represents a basal lineage among attine ants and serves as sister group to Mycetophylax.
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neorufibarbis
New World Red Bearded Ant
Formica neorufibarbis is an alpine ant species in the genus Formica, described by Emery in 1893. Research indicates this species exhibits worker size polymorphism that affects colony fitness, with colonies showing mean worker head widths ranging from 0.89–1.24 mm. The species has been studied for its nest site selection behavior at high elevations, specifically its use of rock versus soil substrates. It belongs to the fusca group within Formica and has been documented in montane environments of the western United States, including the Sierra Nevada.
Formicoxenus
Guest Ants
Formicoxenus is a genus of myrmicine ants comprising seven described species. All members are obligate xenobionts (guest ants) that live within nests of host ant species, primarily in the Nearctic and Palearctic regions. The genus is notable for repeated evolution of social parasitism and is closely related to Leptothorax and Harpagoxenus within the Formicoxenus genus-group. Species exhibit specialized behavioral and chemical adaptations for integration into host colonies.
Pheidole adrianoi
Florida Rosemary Big-headed Ant
Pheidole adrianoi is a species of big-headed ant in the genus Pheidole, described by Naves in 1985. The species is known from Florida, where it has been recorded in association with Florida rosemary (Ceratiola ericoides) habitats. As with other members of the hyperdiverse genus Pheidole, this species exhibits worker polymorphism with distinct major and minor worker castes. The species has been documented through iNaturalist observations, though detailed biological studies remain limited.
Pheidole cerebrosior
Pheidole cerebrosior is a species of higher myrmicine ant in the family Formicidae, described by Wheeler in 1915. It belongs to the hyperdiverse genus Pheidole, which is characterized by worker polymorphism with distinct major and minor castes. The species is part of the Attini tribe, which includes the well-known fungus-growing ants, though Pheidole species are not fungus-growers themselves. Information regarding its biology, ecology, and distribution remains limited in the available literature.
Pheidole clementensis
San Clemente Island Big-headed Ant
Pheidole clementensis is a species of big-headed ant in the genus Pheidole, described by Gregg in 1969. It is endemic to San Clemente Island, California, and is recognized as a distinct species within the highly diverse genus Pheidole, which contains over 1,000 species globally. Like other Pheidole species, it exhibits worker polymorphism with distinct soldier and minor worker castes.
Pheidole gilvescens
Pheidole gilvescens is a species of big-headed ant described by Creighton and Gregg in 1955. As a member of the hyperdiverse genus Pheidole, it exhibits the characteristic worker dimorphism typical of the genus, with minor workers and major workers (soldiers) differing substantially in head size and morphology. The species name derives from Latin 'gilvescens', meaning becoming pale yellow or tawny, likely referring to coloration. Very little specific biological or ecological information has been published for this particular species.
Pheidole hyatti
Hyatt's Big-headed Ant
Pheidole hyatti is a species of big-headed ant in the family Formicidae. Native to the southwestern United States, Mexico, and Guatemala, it has become invasive in Hawaii and possibly established in Panama, Bolivia, and Argentina. The species was described by Emery in 1895 and contains one accepted subspecies, Pheidole hyatti hyatti. As a member of the hyperdiverse genus Pheidole, it exhibits the characteristic worker polymorphism with distinct major and minor worker castes.
Pheidole porcula
Pheidole porcula is a species of big-headed ant in the genus Pheidole, described by Wheeler in 1908. As a member of this hyperdiverse ant genus, it exhibits the characteristic worker polymorphism with distinct major and minor worker castes. The species is placed within the tribe Attini, though unlike the well-known fungus-growing ants in this tribe, most Pheidole species are generalist foragers. Specific details about its biology and ecology remain poorly documented in available literature.
Pheidole subarmata
Pheidole subarmata is a species of big-headed ant in the genus Pheidole, first described by Mayr in 1884. The species belongs to one of the most diverse ant genera globally, with over 1,000 described species in the New World alone. As with other Pheidole species, it exhibits a dimorphic worker caste system with minor workers and major workers (soldiers) distinguished by head size. The species has been documented across South America and the Caribbean.
Pheidole tysoni
Tyson's Big-headed Ant
Pheidole tysoni is a species of big-headed ant in the genus Pheidole, described by Auguste Forel in 1901. As a member of this hyperdiverse ant genus, it exhibits the characteristic worker polymorphism with distinct major and minor worker castes. The species is part of the myrmicine subfamily and is classified within the Attini tribe. Available information about its biology and ecology remains limited in the provided sources.