Lives among photophilous algae from subtidal grounds down to 40m deep. Grazer. « The shells dredged in deeper water are transported. » – S. Gofas: “Notes on some Ibero-Moroccan and Mediterranean Tricolia with description of new species”, Journal of Molluscan Studies (1993), 59, p.355.
 
« Aperture broad, rounded. Outer lip and growth lines showing three shallow sinuosities. […] When only shells are available,T. deschampsi may be recognized by the shallow subsutural sinuosity of the outer lip. »

« Umbilical chink very narrow, bordered by a sharp, white keel. […] Protoconch opaque white. Colour pattern of teleoconch whorls with usually pink (occasionally brown) lines, on a translucent background, and opaque white areas. Pink lines sharp and narrow, arranged more or less parallel to the growth lines. A narrow white surface with wavy contour around the umbilicus, a series of opaque white patches on the periphery of the body whorl. Irregular white areas extending over large surfaces on some specimens. » – The pink lines, in this description, follow the growth striae, while they cross them obliquely in entomocheila.