Figure 2.

Schemes of body plans of Paralvinella hessleri : the sensory and neural structure. A: Lateral view of the general body plan. Most of the parapodia setae are omitted. B: The epidermal sensory systems (green), major epidermal cilia. The patch type cilia on the branchial crown are represented as lines, and most of the cilia on trunk are omitted for clarity. C: The central nervous system and some peripheral nerves. The cell bodies (purple), major neural axons (red lines), and sensory organs (green patches). Divisions between the subesophageal ganglia and ventral nerve cords are not clear. Below left: The enlargement of rostral parts of the body to show the details of neural projections and epidermal ciliary sensory cells, side view. Below right: Dorsal view of the bi-lobed prostomium and the brain. On the left-hand side, the repeated features of glial and ciliary sensory cells (green) are located inside of the nuchal groove. The position of small globuli cell clusters or the mushroom body and distributed sensory cells are shown with axonal projection to the brain.