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Fig. 5 | BMC Evolutionary Biology

Fig. 5

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

Fig. 5

Schematic overview showing the pattern of FMRFamide-LIR and aTub-LIR during the development of O. fusiformis. Note that main neural patterns and the position of the digestive tract are color coded. Stages are given in days post fertilization (dpf). Ventral is left and apical is up in all images, except of the 28 dpf stage, where ventral is down. The inset shows a ventral view of the 28 dpf stage. The schemes presented here are simplified to support an understanding of the complex morphology. acn, apical ciliary ring nerve; an, anus; ao, apical organ; at, apical tuft; cb, ciliary band; cc, circumesophageal connective; ch, chaetae; cs, chaetal sac; dpdr, dorsal part of the dorsal root of cc; dpvr, dorsal part of the ventral root of cc; dr, dorsal root of cc; en, esophageal nerve; ep, episphere; es, esophagus; fn, FMRFamidergic neuron; hg, hindgut; ln, lateral nerve; lo, longitudinal nerve; mg, midgut; mo, mouth opening; pcn, posterior ciliary ring nerve; vn, ventral nerve cord; vpdr, ventral part of the dorsal root of cc; vpvr, ventral part of the ventral root of cc; vr, ventral root; 1–5, numbers referring to the specific nerves of vn

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