Actinoporus elegans Duchassaing 1850

Figure 8.Actinoporus elegans. A Fully expanded specimen in natural habitat B Partially contracted specimen in natural habitat C Oral view D Detail of double rows of tentacles E Lateral view F Cross section through proximal column, showing retractor and parietobasilar muscles G Longitudinal section through column margin showing marginal sphincter muscle H Longitudinal section through base showing basilar muscles I Longitudinal section through tentacles J–P Cnidae.– actinopharynx: J basitrich K microbasic p-mastigophore; column: L basitrich; filament: M basitrich N microbasic p-mastigophore; tentacle: O basitrich P spirocyst. Abbreviations.– bm: basilar muscle, e: epidermis, f: filament, fo: fosse, g: gastrodermis, lm: longitudinal muscle, m: mesoglea, od: oral disc, pd: pedal disc, pm: parietobasilar muscle, rm: retractor muscle, sp: sphincter, t: tentacle, vs: vesicles. Scale bars: A–C, E: 10 mm; D: 2 mm; F–I: 200 μm; J–P: 25 μm.