Teredo is a genus of highly modified saltwater clams which bore in wood and live within the tunnels they create.

They are commonly known as "shipworms;" however, they are not worms, but marine bivalve molluscs (phylum Mollusca) in the taxonomic family Teredinidae.

The submarine HMS Teredo may also have been named after this genus, which works invisibly, below the surface, and can be very damaging to marine installations made of wood.

Like most marine based bivalves, teredo worms are primarily filter feeders and consume mostly seston, and not wood.

[2] Wood supplements their primary diet and is consumed with the assistance of bacteria inside their [gill] cells.