Black snail embryos in their ovicapsule

Ovicapsule of the black snail Pachycymbiola brasiliana, on a large accumulation of red algae from the Rhodophyta group, Anotrichium furcellatum and Callithamnion sp, as well as the green algae from the Chlorophyta group, Bryopsis plumosa, on a beach in Mar del Plata, Argentina.