Fig. 11

The central nervous system and midgut in the trunk of Colossendeis angusta (Colossendeidae). Reconstructions of the CNS (3D volume rendering, green) and midgut (3D surface, magenta) based on a µCT scan of an adult female. The white arrowheads point to the origin of the posteriorly projecting proctodeal nerve. Asterisks indicate the incompletely reconstructed optic nerve (insufficient resolution). Trunk segment 2 is labeled in quotation marks (“ts2”) as it is fused with the other segments, but fusion borders are still discernible in the cuticle. 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. Right side: CNS and midgut. Note the two anterior midgut diverticula (d1 and d2). For reference, unreconstructed dorsal parts of the trunk are shown in transparent gray