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PIntroFIG 7: P. pacificus pharynx.
A. Longitudinal EM through stoma of euryostomatous form with dorsal tooth (arrowheads). The dorsal tooth attaches to pharyngeal muscle (green) and contains an opening for vesicles from the dorsal pharyngeal gland (purple) to be released into the stoma. A subventral tooth (arrow) is seen on the opposite side. Scale bar, 1 µm.
B. Transverse EM micrograph through a euryostomatous stoma showing dorsal tooth (arrowhead) with lumen for dorsal pharyngeal gland secretions. A subventral tooth (arrow) is found in the subventral sector of the stoma. Scale bar, 1 µm. (Image source: Ralf Sommer Lab, Bumbarger13-154.) C. DIC comparison of eurystomatous (left) and stenostomatous (right) forms. The eurystomatous form contains an obvious dorsal tooth (arrowhead). (Image source: Erik Ragsdale.)
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