CALYPTRAEIDAE / Crucibulum spinosum
 

click for a larger image

Crucibulum spinosum  (G. B. Sowerby I, 1824) 

Collected while snorkeling between 1 to 5 meters
deep, attached on buried muddy stones;
Laguna de Barra de Navidad, Jalisco, Mexico;
January 2018

ID 9900: 30 mm, F+++ / GEM