abyssal seaの例文

""'Provanna abyssalis " "'is a species of abyssal sea snail, a marine gastropod mollusk in the family Provannidae.
They are abyssal sea cucumbers, and may be the deepest-living group of echinoderms : species of the genera " Myriotrochus " and " Prototrochus " ( such as " Prototrochus bruuni " ) have been identified down to deep.