[is]
samlokur af ættinni Arcidae; hér við land lifa a.m.k. hörpubirða (A. pedtunculoides) og vörtubirða (A. nodulosus).
[en] ark clams is the common name for a family of small to large-sized saltwater clams or marine bivalve molluscs in the family Arcidae. Ark clams vary both in shape and size. They number about 200 species worldwide (Wikipedia)