Spot 02: at low tide on rocks and at the foot of wall, la Jalousie pool, off Sainte-Marie, Ré island. 28-34mm.
Shells are slender, sometimes banded, high-spired, more brown than sandy-coloured, with minute scales.

Spot 03: at low tide, in stones and pebbles along the road to Le Platin oyster parks, Rivedoux, Ré island. 40-46mm.
Shells are larger, rounder, often banded, and darker coloured than in spot 02. The varices are less pronounced.

Spot 08: at low tide, in pools and under stones, Les Vincentes, L'Écuissière, Dolus, Oléron island. 32-35mm.
Shells are smaller, with dark spiral cords on a pale background. Varices and labial wings are well developped.

Each group shows subtle differences in the way some characters are displayed: shape, sculpture, colours and scales build an average-type that is clearly not the same from a spot to an other. If the little shells from Ste-Marie (circle 1) are typical of rocky shores exposed to waves, those from Rivedoux (circle 2) develop some features that I never met elsewhere; maybe it's the "oyster-park design" in quiet waters. The specimens from Le Jeamblet look perfectly normal (circle 4), but the little beasties from Les Vincentes (circle 3), with their funny convict-pattern, even if they live in the same wavy conditions than those from Ste-Marie, are totally different: for example, their varices are thin, like little razors, and not rounded.
It has often been noticed that Pteropurpura inornata (Récluz, 1851) cannot escape the oyster & mussel parks; this may signify our little native Drill will continue to reign on european coasts, without suffering any pressure from its new competitor.