FIGURE 6. Reconstruction of †Archaeochionelasmus nekvasilovae Kočí, Newman & Buckeridge, gen. et sp. nov. A. Wall based on the fossil, operculum low in accordance with the low profile and tight sutures of the wall that suggest it may have been an epibiont of large marine reptiles or cephalopods. The presence of imbricating plates is based on ribbons of sediment adhering to the base of the wall plates. Their arrangement is patterned after that found in B, the generalized form as typified by Eochionelasmus ohtai Yamaguchi & Newman, 1990. which is the basis for their arrangement in higher forms; cf. Waikalasma boucheti Buckeridge, 1996 and Catophragmus in Ross & Newman (2001). Parietal plates R, RL, CL and C (rostrum, rostrolatus, carinolatus & carina respectively) and opercular s and t (scutum and tergum respectively), with the relative positions of the paired and unpaired plates making up the imbricating whorls identified accordingly.