Let's start with these amazing turreted eyes of the Erbenochile erbeni, the only eyes like them in the trilobite schizochroal eye group, that's mainly down to the eye shades, we'll come back to those shortly. Firstly the closely packed lenses show hardly any sclera (fibrous membrane of the eye), between them. The dorsoventral files (vertical rows of the dorsal and ventral surfaces), of 18 lenses rise up and down the 7mm cylindrical tower, in around 34 rows, thats well over 500 lenses on each eye column. These columnar towers terminate at the top with a palpebral lobe (overhanging flange), the Erbenochile's most striking feature, described (Fortey and Chatterton 2003), as an eye shade. Experiments were conducted with over-lighting showing how the surface of the lenses would be shaded from light penetrating through the water surface to a shallow sea bottom. The trilobite it is thought, would lie in wait buried just beneath the surface of the sandy bottom with only its turreted eyes exposed (levi-setti 2014).
This most remarkable example has other features which lift it above its relatives. The carapace (exoskeleton), is in an excellent state of preservation. Short spines run along each genal spine (cheek spines), over each leading or upper edges. Each pleural furrow (body segment), also has spinosity. From the occipital lobe through the axial lobe (central raised part), the axial pleura each feature one large fine spine, which dominate the exoskeleton along with smaller spines or pustules. The whole is well preserved through to the pygidium (tail section or shield), with its well defined raised pleural furrows. The pleura of the thorax (body) terminate in stout spines, these runs through to the pygidium where similarly, spines protrude creating the appearance of a fine frill surrounding the carapace.
The overall work of the preparitor is sensational in this example, the spinosity is great, a multitude of fine spines on the genal spines and the pleural furrows and upper pleura edges creates a comb effect to the author, the temptation to touch these fine comb like protruding spines is very tempting, but the apprehension of removing them stronger!