FIGURE 21 in Morphological revision of the genus Aiptasia and the family Aiptasiidae (Cnidaria, Actiniaria, Metridioidea)

FIGURE 21. Internal anatomy of Laviactis lucida comb. nov. A) Cross section of the column at the level of the actinopharynx showing the cycles of mesenteries (indicated by roman numerals between pairs). B) Detail of a longitudinal section of the proximal end showing the distinct basilar muscles (arrows). C) Longitudinal section of the distal column showing the weak mesogleal marginal sphincter muscle. D) Cross section through distal column showing the ectodermal longitudinal musculature. E) Cross section through a tentacle showing the ectodermal longitudinal musculature. F) Detail of longitudinal section of the tentacle showing a tentacular vesicle; notice zooxanthellae in gastrodermis and nematocyst batteries in epidermis (arrows). Abbreviations: ep, epidermis; ga, gastrodermis; me, mesoglea; s, siphonoglyph. Scale bars: A, C–F, 0.1 mm; B, 0.05 mm.