How can you tell the difference between the ventral and dorsal surface of a nightcrawler?

The ventral surface of a nightcrawler is typically lighter in color and has a smoother texture, while the dorsal surface is darker and may have a rougher appearance due to the presence of bristles (setae). The dorsal side also features a segmented pattern that is more pronounced. Additionally, the mouth is located on the ventral side, further helping to distinguish between the two surfaces.