Molluscs
The molluscs compose the large phylum of invertebrate
animals known as the Mollusca. Around 85,000 extant species
of molluscs are recognized. Molluscs are the largest marine
phylum, comprising about 23% of all the named marine organisms.
Numerous molluscs also live in freshwater and terrestrial habitats.
They are highly diverse, not just in size and in anatomical structure,
but also in behaviour and in habitat.