Radiographie d'un Tonna sulcosa. Image noir et blanc. Tags: Tonna sulcosa; Tonnidae; coquille; coquillage; spirale; hélice; radiographie; rayons X; transparence; hélicoïdal; fond noir; delicat; fragilité; fragile; radiograph; X rays; ray; transparency; spiral; shell; helix; helicoid; black; background; monochromic; simple; natural; sharp; defined; regular; Nature; conical; banded tun shell; winding; increasing; decreasing; delicate;