Pheidole

is the world's most species-rich ant genus. These myrmicine ants have a cosmopolitan distribution but are particularly diverse in the tropics, filling a number of niches from seed-harvesting to ant-plant symbionts. The genus is marked by a pronounced worker caste polymorphism; major workers are considerably larger than minors and have disproportionately large heads.

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Major workers of the South American species Pheidole aberrans have an unusually large head even for a Pheidole.

Bento Gonçalves, Rio Grande do Sul, Brazil

Pheidole aberrans, major and minor workers.

Bento Gonçalves, Rio Grande do Sul, Brazil

A minor worker of Pheidole aberrans, a small but ambitious South American harvester ant, lugs a grass seed to her nest.

Correa, Santa Fe, Argentina

Major and minor workers of Pheidole barbata, a small harvester ant.

Carrizo Plain National Monument, California, USA

Pheidole bergi

Frías, Santiago del Estero, Argentina

Pheidole biconstricta is one of the larger and more common Pheidole in northern South America.

Icononzo, Tolima, Colombia

Pheidole californica, major worker.

Stebbins Cold Canyon Reserve, California, USA

Major workers of the South American species Pheidole aberrans have an unusually large head even for a Pheidole.

Bento Gonçalves, Rio Grande do Sul, Brazil

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Keywords: white soldier caste myrmicinae pheidole abberans major worker big headed ant

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Pheidole

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