marked and equally ovate, roundish or pear-shaped.

Habitat

This species can be found on brown algae (genus Fucus), in clefts of rocks, on stones, on mud or sand. Most will be found on sandy beaches along the line of the last tide.

Species

Species within the genus Rissoa include:
* Rissoa aartseni Verduin, 1985
* Rissoa acerosa Seguenza, 1903
* Rissoa acutata

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