Euraphia depressa collected from Khao Sam Muk beach, Chon Buri (BUU16.CH.ED01). A. Dorsal and ventral view of external shell, B. External (left panel) and internal (right panel) view of tergum (upper panel) and scutum (lower panel), C. External (upper panel) and internal (lower panel) view of shell plates, D-G. Light microscopy on mouthparts, D. Labrum, E. Close up on the teeth of the labrum, F. Mandible with three large teeth, G. Close up on the pectinated lower margin of mandible. D–G. Scale bars in µm. Abbreviations: c, carina; cl, carinal latus; l, latus; r, rostrum.