Three nests of T. extranea, found in "igapó" forests in the locality of Samaúma, mouth of Daraã river (64°45'35" W, 0°27'7" S), AM, Brazil, are described and illustrated. This is the only place from where this species is known. All nests were located in hollow of dried branches of "Tanimbuca" - Buchenavia suaveolens Eichler (Combretaceae). Two of them were sharing the hollow with nests of Frieseomelitta sp. and one was solitary. One nest had 46 brood cells, 43 adult workers and one physogastric queen; the second one, 240 cells, 117 adult workers, 25 males and one physogastric queen; the third one, 260 cells, 163 workers, one physogastric queen and one queen pupa. The cells are arranged in clusters, like in Frieseomelitta, and the queen cells has the same shape and size as the worker ones. There are no food pots - this is the only known Meliponini that does not store food. Supposedly, this species is cleptobiotic. Queens and males are also described.
Cleptobiosis; nest; stingless bees; Trichotrigona
