Lateral, protrusive and repressive excursions of the mandible are guided by the posterior system. The protrusive force is located at the leading edge and pushes against the cell membrane. They bore protrusive, presumably structural, ribs on their upper and (seemingly) lower surfaces. Bulhan was a protrusive general and a well-known sharpshooter in northern Somalia. Mouth is rather small, more or less protrusive, with rather strong canine-like teeth. The mandibulae are protrusive, and the skin soft, with mucus. Most "Diplocraterion" show only protrusive spreit (e.g., "D. parallelum, D. polyupsilon, D. biclavatum").