Hyposmocoma pupumoehewa is a species of moth of the family Cosmopterigidae.

The larvae have been observed feeding on snails of the genus Tornatellides.

The larvae live in a larval case which has the form of an elongated structure with one entrance at each end.

It is decorated with bits of sand and pebbles heavily woven with silk filaments.

[1] The specific name is derived from the Hawaiian, pūpū (meaning snail) and moehewa (meaning nightmare) and refers to the unique feeding habits of the caterpillars.