Figure 2 in The pros and cons of using micro-computed tomography in gross and micro-anatomical assessments of polychaetous annelids

Figure 2. Pharyngeal anatomy of Glyceridae: Glycera tesselata (PTA-staining) (a–c); Pilargidae: Sigambra parva (d–f) and Polynoidae: Lepidonotus clava (g-i). Glycera a) surface morphology showing everted pharynx; b) longitudinal section through everted pharynx; c) transverse section of gut as indicated by line in b); scale bars = 0.5 mm. Sigambra d) surface morphology showing everted morphology; e) longitudinal section through the pharynx; f) transverse section through distal pharynx as indicated by the line in e); scale bars = 0.5 mm. Lepidonotus g) surface morphology showing everted pharynx; h) longitudinal section through pharynx; i) transverse section through distal pharynx as indicated by line in h); scale bar = 1.00 mm. P = pharynx. All three examples show a relatively short axial pharynx approximately as wide as long. The distal part of the pharynx is characterised by distinct muscle blocks which when contracted form a cruciform cross section. Specimens were scanned using the SkyScan 1172 microtomograph at HCMR at 60kV / 167µA, without a filter, no camera binning, full rotation of 360°, tungsten target. Abbreviations used: J–jaws; P–pharynx; PG–poison glands; Pr–prostomium; PS–proboscidian sheath; RM–ring muscle.