Fig. 13.

Comparative myogenesis in female Dinophilus gyrociliatus and D. taeniatus. The individual muscular groups are colour coded (circular muscles in red, ventral and ventrolateral longitudinal muscle bundles in dark grey, dorsolateral longitudinal muscle bundles in light grey, circular and longitudinal muscles of the digestive system in dark green); female Dinophilus gyrociliatus are depicted on the left hand, females of D. taeniatus on the right hand. Stages are indicated by silhouettes next to the figure capture (also indicating the size difference at this stage between the two species D. gyrociliatus in white and D. taeniatus in orange), and the assignment to the respective stage next to them. The first signs of difference between the two species are emphasized by a yellow dashed-lined frame around the picture. a Early embryo (3 days in D. gyrociliatus or 7–9 days in D. taeniatus after the eggs are deposited, respectively), b late embryo (5–5.5 or 12–14 days after the eggs are deposited, respectively), c prehatching females (5.5 or 13–20 days after the eggs have been deposited, respectively), d early juvenile, e adult females (older than 14 days or several weeks after the eggs are deposited, respectively). Abbreviations: an – anus, cb1-14 – ciliary band 1–14, cch – compound cilia of the head, cm – circular muscle, cmds – circular muscle of the digestive system, dlca – contralatero-anterior branch of the dorsolateral longitudinal muscle, dlcb – contralateral branch of the dorsolateral longitudinal muscle, dldb – dorsal branch of the dorsolateral longitudinal muscle, dlia – ipsilatero-anterior branch of the dorsolateral longitudinal muscle, dlib – ipsilateral branch of the dorsolateral longitudinal muscle, dlvb – ventral branch of the dorsolateral longitudinal muscle, dm – diagonal muscle, ds – digestive system, dsm – musculature of the digestive system, e – eye, egg – egg, hg – hindgut, lmds – longitudinal muscle of the digestive system, mo – mouth opening, mrmo – muscular ring around the mouth opening, phb – pharyngeal bulb, pyg – pygidium, vca – contralatero-anterior branch of the ventral longitudinal muscle, vcb – contralateral dorsal branch of the ventral longitudinal muscle, vlca – contralatero-anterior branch of the ventrolateral longitudinal muscle, vlcb – contralateral branch of the ventrolateral longitudinal muscle, vldb – contralatero dorsal branch of the ventrolateral longitudinal muscle, vldb – dorsal branch of the ventrolateral longitudinal muscle, vlia – ipsilaterial branch of the ventrolateral longitudinal muscle, vlib – ipsilatero-anterior branch of the ventrolateral longitudinal muscle, vllm – ventrolateral longitudinal muscle, vlm – ventral longitudinal muscle, vlvb – ventral branch of the ventrolateral longitudinal muscle