Shell and opercular plates of Galkinius maculosus sp. n. A (LM) and B (SEM) of dorsal view of fused shell (Holotype, ASIZCR000343) C Ventral view of shell (SEM) with internal rids radiating from rim of inner operculum (CEL-LAN-075-09) D Dorsal view and E Ventral view of fused scutum and tergum (ASIZCR000343) F Dorsal view (CEL-DSA-012-9) and G Ventral view (CEL-DSA-012-9) of fused scutum and tergum under Scanning Electron microscope H Horizontal striations on external surface of scutum I Horizontal striations on external surface of tergum. Scale bars in µm. Abbreviations: AP: adductor plate, S: scutum, T: tergum, MF: medial spur furrow, RT: rostral tooth, AD: adductor muscle scar, SP: spur.