Fusus sulcatus Lamarck, 1816Fusus zelandicus Quoy and Gaimard, 1833Fusus adustus Philippi, 1845 Penion sulcatus is a species of medium-to-large predatory marine snail or whelk, commonly called the northern siphon whelk or kākara nui in Māori, belonging to the whelk family Austrosiphonidae.

[5] This hypothesis is based on geometric morphometric analysis of shell shape and size for all four taxa, as well as the analysis of morphometric variation exhibited all living species of Penion.

[3][6] The species has an abundant fossil record in the North Island of New Zealand.

[7][8] P. sulcatus is benthic and is common on soft-sediments on the continental shelf[9] or within the subtidal rocky shore environment.

[4] Shells found in middens of historic Māori settlements indicate that P. sulcatus may have been intentionally foraged as a food-source.