Not extreme but well workerless or with workers inquilines.

[Teleutotje]

Shigayev, C.; Snegovaya, N. 2022. Monomorium ellenarium sp. nov., a new inquilinous ant species (Hymenoptera: Formicidae) of the Monomorium monomorium group from Azerbaijan Republic. Munis Entomology & Zoology 17 (2):1197-1202.

Pdf:

https://antcat.org/documents/8277/shiga ... baijan.pdf

[Teleutotje]

Messer, S. J.; Cover, S. P.; Rabeling, C. 2020. Two new species of socially parasitic Nylanderia ants from the southeastern United States. ZooKeys 921:23-48.

https://doi.org/10.3897/zookeys.921.46921 or https://antcat.org/documents/7837/messe ... pecies.pdf

Messer, S. J.; Cover, S. P.; LaPolla, J. S. 2016. Nylanderia deceptrix sp. n., a new species of obligately socially parasitic formicine ant (Hymenoptera, Formicidae). ZooKeys 552:49-65.

https://doi.org/10.3897/zookeys.552.6475 or https://antcat.org/documents/6525/messe ... enopte.pdf

[Teleutotje]

Mera-Rodríguez, D.; Jourdan, H.; Ward, P. S.; Shattuck, S.; Cover, S. P.; Wilson, E. O.; Rabeling, C. 2023. Biogeography and evolution of social parasitism in Australian Myrmecia bulldog ants revealed by phylogenomics. Molecular Phylogenetics and Evolution 186 (107825):1-18.

Text, pdf and 2 supplements:

https://www.sciencedirect.com/science/a ... via%3Dihub

[Teleutotje]

A picture from the above publication, all the social parasite:

[Teleutotje]

Four new inquiline social parasite species in the dolichoderine ant genus Tapinoma (Hymenoptera, Formicidae).
Stefan P. Cover, Christian Rabeling.

Text, pdf and key:

https://zookeys.pensoft.net/article/120478/

[Teleutotje]

Yes, a very special ant, only queens but without workers and without males, very special!!!

Hamaguchi, K.; Kinomura, K.; Kitazawa, R.; Kanzaki, N.; Heinze, J. 2026. A parasitic, parthenogenetic ant with only queens and without workers or males. Current Biology 36:R123-R124.

Pdf:

https://www.antcat.org/references/144641

Pdf and text and supplement:

https://www.sciencedirect.com/science/a ... rss_sd_all

The description of the species:

Terayama, M.; Onoyama, K. 1999. The ant genus Leptothorax Mayr (Hymenoptera: Formicidae) in Japan. Memoirs of the Myrmecological Society of Japan 1:71-97.

Pdf:

https://www.antcat.org/references/132447