Fig. 2

Comparison of two different scan methods to reconstruct a transverse plane of the anterior part of the labrum from two separate individuals of Mesorhabdus gracilis. Dashed lines identify the boundaries of the labeled glands (see abbreviations list and Table 1 for gland and muscle names and abbreviations). a Scan from SBF-SEM. b Scan from two-photon excitation microscopy. Note the significant differences in appearance of gland contents between these two individuals, which suggests that high-resolution images of gland contents may not be very informative phylogenetically