Fig. 6

Schematic summary of myogenesis in Wirenia argentea (Neomeniomorpha). The muscular system of each stage is shown in dorsal and ventral view. Dorsal muscle systems are seen from ventral, ventral muscle systems are seen from dorsal. Median cross sections indicate the relative position of each muscular element. For better visualization of individual muscular elements, the outer set of the dorsoventral musculature is not shown in ventral and dorsal schemes, and the heliocoidal muscle layer is omitted in all aspects. Muscle units are indicated by color code: yellow, prototroch muscle ring; dark blue, enrolling muscle; light blue, pharyngeal retractor; green, ventrolateral muscle; light green, pretrochal muscle system; violet, inner dorsoventral musculature; light violet, outer dorsoventral musculature; cyan, ring musculature; red, rectus muscle; orange, ventromedian muscle. For details on early myogenesis, see [9]