Family Onchidiidae Rafinesque, 1815

Remark. Onchidiidae are found in different habitats, including mangroves and some of them are probably mangrove-associated species (e.g. Dayrat 2009). Due to lack of species level (and sometimes even genus level) identifications, we did not assess their relationships to mangrove vegetation. In figure 9G an aggregation of onchidiid molluscs in Nha Phu is illustrated.