Fig. 4
From: Ultrastructure of sensilla on antennae and maxillary palps in three Mesembrinellidae species
Scanning electron micrographs showing the cuticular surface of flagellum in both genders of Mesembrinella bellardiana: a arista of female divided in two (I-II) segments (× 450), b arista of male divided in three (I-III) segments (× 500), c first flagellomere of female (× 1200); d first flagellomere of male (× 600). Fn = first flagellomere; Mc = microtrichia; Tr = trichoidea; Ba = basiconic; Cl = clavate; Op = Olfactory pits