[2] The shell of Atrina zelandica is triangular, elongate and blackish, while the inside is pearly purple.

[3] The valves are convex with rather close longitudinal ribs and semi-cylindrical hollow spines.

[5] The shell of Atrina zelandica has a crenellated posterior edge that extends a few centimeters above the substrate.

[2] They inhabit depths of up to 50 m, primarily in muddy sand in the intertidal and subtidal zones in sheltered waters, and are widely distributed across the country.

[5] However, Atrina zelandica has experienced frequent die-offs in the Rangitoto Channel.