Records of the longhead catshark are patchy and widely spread in the Indo-Pacific region: it is known from the East China Sea, southern Japan, the Seychelles, the Philippines, Mozambique, New Caledonia, and northern Australia off Townsville, Ashmore Reef, and North West Cape.
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It is the lignotuberous form of the species, and occurs along the north-west coast of Western Australia, between Carnarvon and North West Cape.
In the south west the range ecompasses an area between North West Cape, Cape Leeuwin and Eucla; while in the east it covers are large region bounded by the Atherton Tableland, the Eyre Peninsula and Tasmania, with the Murray Darling Basin supporting very large populations of Black Swans.
Lenaert Jacobszoon, captain of the Dutch East India Company who, in 1618 sighted North West Cape in the north-west of Western Australia