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Fig. 12 | Frontiers in Zoology

Fig. 12

From: A microCT-based atlas of the central nervous system and midgut in sea spiders (Pycnogonida) sheds first light on evolutionary trends at the family level

Fig. 12

The central nervous system and midgut in the trunk of Pycnogonum litorale (Pycnogonidae). Reconstructions of the CNS (3D volume rendering, green) and midgut (3D surface, magenta) based on a µCT scan of an adult male. The white arrowheads point to the origin of the posteriorly projecting proctodeal nerve. Asterisks indicate an incompletely reconstructed portion of the ovigeral nerve (tissue damage). The white arrows highlight additional subdivisions of the dorsal branch of leg diverticulum 2. For better pattern visualization, all major nerves of the right body half were virtually removed in A (right side) and B. A Oblique antero-lateral view. Right top corner: overview of the specimen. Left side: complete CNS and midgut reconstruction. Right bottom corner: anterior portion of the CNS and eyes. B Lateral view of the CNS with and without the midgut structures (top and bottom, respectively). For reference, unreconstructed parts of the right body half are shown in transparent gray. C Ventral view. Left side: CNS in grayscale. The black arrowheads point to the intersegmental nerves. Right side: CNS and midgut. For reference, unreconstructed dorsal parts of the trunk are shown in transparent gray

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