Laevipilina hyalina

Laevipilina hyalina is a species of monoplacophoran, a superficially limpet-like marine mollusk. It is found off the coast of southern California.
Anatomy.
"L. hyalina" is the only "Laevipilina" species with 6 pairs of gills, while all other "Laevipilina" species have 5 pairs.