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Fig. 1 | BMC Evolutionary Biology

Fig. 1

From: Owenia fusiformis – a basally branching annelid suitable for studying ancestral features of annelid neural development

Fig. 1

Schematic overview of the normal development of Owenia fusiformis. Different developmental stages used in this study are shown in schematic drawings (upper part) and photographs (lower part). The timescale indicates the age of different larval stages according to the emergence of distinct morphological features. Stages are shown in dpf (days post fertilization). Note that the development is somewhat asynchronous and only approximately 80–90 % of the larvae of a certain age exhibit the same developmental stage. ao, apical organ; at, apical tuft; cb, ciliary band; ch, chaetae; cs, chaetal sac; ep, episphere; es, esophagus; ey, eye; mg, midgut; mo, mouth opening

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