Cifonauta

The tiny snail Olivella minuta can form dense populations in sandy or sandy-muddy sediments. As it moves around during low tides this snail leaves a grooved trail behind.

Littoraria flava often occurs on rocky shores close to estuaries and mangroves. It is an ovoviviparous species, ant its life cycle includes a planktonic larval stage and a sedentary adult stage. In the Bay Araçá it usually forms large aggregates on rocks and mangrove roots.