FIGURE 6. Pyura lignosa Michaelsen, 1908. A in Pyura (Tunicata: Ascidiacea: Pyuridae) on the coasts of Panama

FIGURE 6. Pyura lignosa Michaelsen, 1908. A. Dissected animal showing the pharynx (stained). B. Dissected animal without the pharynx. C. Lining of the oral siphon. D. Stained anterior region showing oral tentacles and dorsal tubercle with meandering aperture (arrowhead). E. Detail of the atrial side of the dorsal region of the pharynx (stained). F. Detail of the oral tentacle (stained). G. Spinules in the oral siphon. Scale bar = 20 µm.