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Photo#49638
Odorous Ants - Tapinoma - female

Odorous Ants - Tapinoma - Female
Harvard, Worcester County, Massachusetts, USA
April 26, 2006
Size: 2.8 to 4.5mm
There were at least 6 queens in this colony. Is that common?

That is common
and is even the rule in this genus and most other odorous ants (e.g. Linepithema humile). The technical term is polygynous species, as opposed to monogynous ones - like most Lasius. Tapinoma is said to be higly polygynous.
Indeed, some queens can sometimes be seen walking outside among workers, on crowded trails between two nests.

 
That's interesting
I never knew there were such differences in colonies between different ant genus.

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