Figure 2

Schemes of developmental stages of P. dumerilii : mid-trochophore, late trochophore, early metatrochophore and mid-metatrochophore. Left: The scheme indicates the key characteristics of each developmental stage. Right: Next to the scheme a brief summary of the key features for the stage is given. The time points indicated with a star mark the end of each stage and are excluded from this stage. Bold: The name of the stage and in brackets the beginning and end of each stage is given. Italic: The key characteristics, which can be used to determine the beginning of each stage. Normal: Additional features of each stage are given, including some landmarks, which can be seen in the developing nervous system and musculature. From top to bottom: mid-trochophore, late trochophore, early metatrochophore, mid-metatrochophore. All schemes shown as ventral view, anterior up. Abbreviations see abbreviations list.