Descriptive terminology for the elements of colour patterns.

<p>(A, B) <i>Pseudomelania brasili</i> (Bigot, 1938), MNHN.F.J10471 (Cossmann coll.). (A) dorso-labral view. (B) detailed view of the colour pattern. (C) <i>P</i>. <i>brasili</i>, MNHN.F.A46213 (Bigot coll.), apertural view. (D) <i>Gerasimovcyclus</i> cf. <i>lorioli</i> (Schmidt, 1905), MNHN.F.J10402 (Cossmann coll.), dorsal view. (E, F) <i>Ataphrus (Ataphrus) marschmidti</i> Gründel and Kaim, 2006, MNHN.F.J11070 (Cossmann coll.). (E) labral view. (F) detailed view of the colour pattern. (G) <i>Myophorella nodulosa</i> (Lamarck, 1801), UPMC-138 (UPMC coll.), left valve view. Scale bars: 10 mm (A, C, E, G), 5 mm (B, D), 2 mm (F).</p>