Fig. 1
From: Convergent evolution of the sensory pits in and within flatworms
General morphology and localization of sensory pits (arrowheads) in Stenostomum brevipharyngium. A Light microscopy image of a living worm, showing division into rostrum, pharynx, and trunk. B Head region of the worm in the lateral view under scanning electron microscope. C Magnified view of the pit opening. Horizontal optical sections through the anterior region of the worm at the level of ciliated pits stained with DAPI for cell nuclei (D), antibodies against tyrosinated tubulin (E), and phalloidin for F-actin (F). Abbreviations: br brain, g gut, mo mouth opening, np brain neuropile, ph pharynx, pn protonephridium, r rostrum, rm rostral musculature, t trunk, tm trunk musculature