The shell of Kachpurites is subinvolute with a rounded section and bears low, close spaced, moderately sinuous ribs.
The blood vessels in the siphuncle of Kachpurites consist of one large central vein with four arteries. This size and arrangement of the blood vessels is nearly identical to the blood vessels found in the siphuncles of other extinct genera such as the Permian prolecanitid Akmilleria or the extant Nautilus. This similarity of all three species show that the size and arrangement of their blood vessels is strongly conserved and it is likely that the last common ancestor of Ammonoidea and Nautilida also had similar structure.[3]
There have been malformed shells of Kachpurites fulgens discovered. They have small elongated pits that are arranged into groups on the surface of the shell and concentrated near the terminal aperture. Without changing in thickness they are bend downwards. These pits sometimes significantly alter the shape of the shell. Due to a lack of evidence, they are likely not from drilling, biting or healing of puncture wounds. Instead theses malformations were caused by epifauna that were located on the flexible uncalcified part of the periostracum in the apertural region of the growing ammonite shell.[4]
