“…Roman numerals indicate concentration groups (Louveaux et al, 1978;Maurizio, 1976): Group I (<20,000), Group II (20,000-100,000), Group III (100,001-500,000), Group IV (500,001-1,000,000), Group V (>1,000,000). Marques-Souza, 1996;Marques-Souza, Absy, & Kerr, 2007;Marques-Souza, Miranda, Moura, Rabelo, & Barbosa, 2002;Oliveira, Absy, & Miranda, 2009) and the stored pollen (Absy, Camargo, Kerr, & Miranda, 1984;Kerr et al, 1986Kerr et al, /1987Rech & Absy, 2011a, 2011b. Among these palynological studies, only Rech and Absy (2011a) worked with T. angustula in addition to eight other species of stingless bees occurring along the Rio Negro River channel in the Brazilian Amazon.…”