Subfamily MYRMICINAE
Tribe ATTINI

Pheidole obscurithorax Naves
Pheidole obscurithorax, full face view of a minor worker (Baldwin Co., AL) (photo by Joe A. MacGown)
Pheidole obscurithorax, lateral view of a minor worker (Baldwin Co., AL) (photo by Joe A. MacGown)
Pheidole obscurithorax, dorsal view of a minor worker (Baldwin Co., AL) (photo by Joe A. MacGown)
Pheidole obscurithorax, full face view of a major worker (Baldwin Co., AL) (photo by Joe A. MacGown)
Pheidole obscurithorax, lateral view of a major worker (Baldwin Co., AL) (photo by Joe A. MacGown)
Pheidole obscurithorax, lateral view of a major worker (Baldwin Co., AL) (photo by Joe A. MacGown)
Pheidole obscurithorax, full face view of a major worker (Jackson Co., MS) (photo by Joe A. MacGown)
Pheidole obscurithorax, lateral view of a major worker(Jackson Co., MS) (photo by Joe A. MacGown)
Pheidole obscurithorax, lateral view of a major worker (Jackson Co., MS) (photo by Joe A. MacGown)
Pheidole obscurithorax, full face view of a dealate queen (Baldwin Co., AL) (photo by Joe A. MacGown)
Pheidole obscurithorax, lateral view of a dealate queen (Baldwin Co., AL) (photo by Joe A. MacGown)
Pheidole obscurithorax, lateral view of a dealate queen (Baldwin Co., AL) (photo by Joe A. MacGown)

Introduction

Pheidole obscurithroax is a large, dark colored species native to South America that is now common along the US gulf coast from northern FL to eastern Texas. Based on the steady expansion of its range in the US and its ability to successfully compete with the red imported fire ant (Solenopsis invicta Buren) and native species nesting in the same habitat, this species shows invasive potential in the US.

Taxonomic History (from Bolton, 2012)

Identification
Minor Worker: (from MEM specimens).

Major Worker: (from MEM specimens).

Queen: (from MEM specimens). Similar to workers in color and general appearance except with mesosoma developed for wings and with wings present in alate specimens.

 

Biology and Economic Importance

Distribution

US Distribution: Alabama, Florida, Louisiana, Mississippi, and Texas.

Literature Cited

 

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