FIGURE 4 in First inventory of sea anemones (Cnidaria: Actiniaria) from La Paz Bay, southern Gulf of California (Mexico)

FIGURE 4. Internal anatomy of Anthopleura dowii Verrill, 1869. A) Longitudinal section of the distal column showing marginal sphincter muscle and column specializations. B) Cross section of the column at the level of the actinopharynx showing the cycles of mesenteries (cycles marked by numbers). C) Cross section of column showing gametogenic tissue. D) Longitudinal section of proximal end showing basilar muscles. E) Detail of a cross section of the gametogenic tissue. F) Detail of a cross section of the column at the level of the actinopharynx showing the retractor and parietobasilar muscles. Acrorhagi (Ac), Basilar muscles (Ba), Fosse (Fo), Marginal projections (Mp), Parietobasilar muscles (Pa), Peduncle (Pe), Retractor muscles (Re). Siphonoglyphs (arrow). Spermatic cyst (Sc), Sphincter (Sp), Tentacle (Te), Verrucae (Ve). Scale bars: A, C–F, 0.1 mm; B, 0.5 mm.