Ultraspiracle of the stingless bees Melipona scutellaris and Scaptotrigona depilis: cDNA sequence and expression profiles during pupal development Aline Carolina Aleixo Silva Teles, Tathyana Rachel Palo Mello, Angel Roberto Barchuk and Zilá Luz Paulino SimõesApidologie, 38 5 (2007) 462-471DOI: https://doi.org/10.1051/apido:2007035