NOTE: According to notes in Rosenberg, 2009, the online database Malacolog 4.1.1, H. antiquatus was described without a type locality. This same species was previously considered to occur in both the Eastern Pacific and the Western Atlantic, but some records of this species from the Western Atlantic may in fact be H. leptus instead.
Mestayer M.K. (1929) Notes on New Zealand Mollusca. 4. Transactions and Proceedings of the New Zealand Institute 60(1): 247–250, pls 20–25. [Published 31 May 1929]
Dell, R.K., 1956. The archibenthal Mollusca of New Zealand. Dominion Mus. Bull. Wellington 18: 1-235
Vaught, K.C. (1989). A classification of the living Mollusca. American Malacologists: Melbourne, FL (USA). ISBN0-915826-22-4. XII, 195 pp.
Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp.180–213