Micro-CT scans ((a)–(d)) and FIB SEM ((g)–(i)). (a) Single virtual slice of a complete microtomogram of a specimen of Gammarus roeselii. (b) The same image as (a). The outline of the gnathopod element has been marked in OsiriX (red). (c) Volume rendering of the entire microtomogram. The marked structures are the gnathopod and the gut. (d) Comparable image to (c) but now as a surface model. (e) Surface model of the gnathopod after further processing in the 3D-modelling software Blender. (f) The distal part of a right second gnathopod of Gammarus roeselii from posterior as SEM micrograph. (g) A sensillum on the surface of a second gnathopod of Orchestia cavimana. (h) Part of the surface close to the sensillum in (g) milled away. (i) Further milling gives access to the inner structure of the sensillum.
