Fig. 3
From: Inferring muscular ground patterns in Bivalvia: Myogenesis in the scallop Nodipecten nodosus
Myoanatomy of Nodipecten nodosus postlarvae shortly after metamorphosis. Ventral is to the top in all images (postmetamorphic orientation, i.e., larval anterior), anterior is to the left in (a) and (d). Scale bars: 20 μm. a Confocal micrograph revealing that the larval retractors (velum retractors and ventral larval retractors) have been completely resorbed; the anterior adductor has started to degenerate. Lateral view. b Light micrograph of a longitudinal section through a postlarval specimen showing the remaining anterior adductor, the posterior adductor, and the foot retractor. Toluidine blue and basic fuchsin (TB). c Cross-section of a postlarval specimen showing the posterior adductor muscle comprised of smooth and striated portions. TB. d 3D reconstruction of the postmetamorphic musculature showing mantle muscles, adductors formed by striated and smooth portions, and foot musculature with foot retractor and pedal plexus. Lateral view. Abbreviations: aa, anterior adductor; fr, foot retractor; ft, foot; pa, posterior adductor; pp, pedal plexus; sm, smooth portion; st, striated portion