Sagartiogeton erythraios internal anatomy

Photographer: From Zelnio et al. (2009)

A, longitudinal section through distal column, showing mesogleal marginal sphincter;

B, cross-section of the directive mesenteries attached to the siphonoglyph (arrow), showing diffuse retractor muscles;

C, cross-section through a tentacle showing longitudinal ectodermal muscles;

D, cross-section of the pedal disc showing basilar muscles;

E, cross-section of the mesenteries proximally, showing differentiated parietobasilar muscles differentiated (arrow).

Scale bars: A, B, 1 mm; C, D, 0.1 mm; E, 1 mm