Argalista umbilicata

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The height of the shell attains 1.9 mm, its diameter 2.75 mm.

This marine species is endemic to New Zealand and occurs off South Island and Chatham Rise.

• Powell, A. W. B. (1926). Mollusca from 100 fathoms off Lyttelton, with descriptions of four new species, and also a new Pliocene fossil. Scientific Results of the New Zealand Government Trawling Expedition, 1907. Records of the Canterbury Museum. 3: 43–50.
• Powell, A.W.B. 1979 New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland
• Spencer, H.G., Marshall, B.A. & Willan, R.C. (2009). Checklist of New Zealand living Mollusca. Pp 196-219. in: Gordon, D.P. (ed.) New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch