The fire ants of the Solenopsis saevissima species-group.

Pitts, J. P.; Camacho, G. P.; Gotzek, D.; McHugh, J. V.; Ross, K. G. 2018. Revision of the fire ants of the Solenopsis saevissima species-group (Hymenoptera: Formicidae). Proceedings of the Entomological Society of Washington 120:308–411.

http://antcat.org/documents/69…Society_of_Washington.pdf

Pitts, J. P., 2002, “A cladistic analysis of the Solenopsis saevissima species-group (Hymenoptera: Formicidae).” Dissertation, University of Georgia, vi + 266 pp.

http://dbs.galib.uga.edu/cgi-b…ts_james_p_200205_phd.pdf

Trager, J. C. 1991. A revision of the fire ants, Solenopsis geminata group (Hymenoptera: Formicidae: Myrmicinae). Journal of the New York Entomological Society 99:141-198.

http://antcat.org/documents/3093/2904.pdf

See more: Literature list of important Solenopsis-references.

And see more: Solenopsis Fire Ants, from AntWiki.

Do you know this?

Genetic analyses reveal cryptic diversity in the native North American fire ants (Hymenoptera: Formicidae: Solenopsis).
PABLO CHIALVO DIETRICH A. GOTZEK DEWAYNE SHOEMAKER KENNETH G. ROSS.
Systematic Entomology. Volume 43, Issue 1. Pages: 109-122. First Published: 29 August 2017.

If you don't know it don't worry. See this (available since today, 01/05/2019):

Pablo Chialvo.
Species delimitation of the native North American fire ants (formicidae: solenopsis): results and applications to life sciences education.
Degree Date: 05/2017.

http://dbs.galib.uga.edu/cgi-b…alvo_pablo_201705_phd.pdf