Figure 3

Adult myoanatomy of Argyrotheca cordata. F-actin is labelled in red and cell nuclei are labelled in blue. Scale bars equal 100 μm in all aspects except in E, where it equals 25 μm. (A) Overlay of CLSM maximum projection micrograph and light micrograph, anterior faces upward, dorsal view. Indicated are the tentacle muscles (tm), the mantle margin muscles (mm), the tentacles of the lophophore (te), the mantle cavity (mc), the intestine (in), the shell (s), the adductors (ad), the ventral pedicle adjustors (vpa), which extend from the ventral valve into the pedicle, the dorsal pedicle adjustors (dpa), which extend from the dorsal valve into the pedicle, and the diductors (di). One diductor is lacking as a result of the removal of the animal from the substrate. (B) Overlay of a CLSM maximum projection micrograph and a light micrograph, anterior faces upward, ventral view. Indicated are the same structures as in A. (C) Enlarged view of the ring musculature lining the intestine (in). In addition, one adductor (ad), the diductors (di), and the ventral pedicle adjustors (vpa) are visible. (D) Enlarged view of the tentacles of the lophophore and the corresponding tentacle musculature (tm). (E) Detail of a tentacle muscle fibre showing typical striation pattern (double arrows).