Queen identification (Felipe, Brazil)


Dear AntAsk,

My friend found this queen near his place and asked me about her genus and species. I guess it is a Paratrechina longicornis queen because he described her size equal to an Atta sexdens queen, and she has little workers by now.

Thank you

Felipe Lei - Mirmecolismo Brasil

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Hi Felipe,

This queen is in fact Solenopsis saevissima, ID courtesy of Dr. James Trager. Coloration within this fire ant species is highly variable, ranging from lighter red to dark brown variations that obey a distinctively north-south clinal distribution across eastern South America. In Dr. Trager's own words, this particular specimen "is one of those really dark S. saevissima from SE Brazil." While the AntWeb page for this species does not have any images (the featured S. macdonaghi belongs to the same subcomplex, however), you can refer to this page on Paraguayan myrmicines to view some photographs of both queen and worker ants of this species for comparison. And just a quick note on relative queen size: P. longicornis queens rarely exceed 5mm, while the much larger Atta queens typically measure upwards of 20mm. Solenopsis queens in the Geminata group (which includes S. saevissima) generally range from 6-9mm.

Thanks for your interest!

Alexandra Westrich & the AntAsk Team

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