Molluscs

Pila ovata, a fresh water snail, feeds on Biomphalaria eggs among other things
Source: Petrie Museum website, UC39127

Certain kinds of small fresh water snails such as Biomphalaria alexandrina have been playing an important, until modern times unrecognized, role in the public health of Egypt. They are hosts for one of the developmental stages of a parasitic worm which causes schistosomiasis. As many ancient Egyptians had occasion to wade through a canal, bathe in the river or an artificial pond, or drink river water the disease was endemic in the country.

But most molluscs had little impact on Egypt and its culture:

Cowrie shell on original string
3rd Intermediate Period
Source: Petrie Museum website, UC37162

Snail-shells served as musical instruments in the pre-dynastic: During the Naqada Period they were occasionally used as whistles, and in later times as rattles.
As food they played a small role since earliest times. In this function they were probably most popular among the Romans.
Shells were occasionally used for ornaments and amulets. The cowrie shell because of its form suggesting female genitalia was a symbol for fecundity.
Spoon and ladle-sized sea shells were used as scoops

Among the marvels of Punt Queen Hatshepsut offered the temple of Amen were among other things

Electrum, eye-cosmetics, throw-sticks of the Puntites, ebony, ivory, shells
J. H. Breasted, Ancient Records of Egypt Part Two, , § 272

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