Belongs within: Vetigastropoda.
Margarella is a genus of small marine gastropods with a thin, globose, nearly smooth shell found around New Zealand and Antarctica (Knight et al. 1960).
<==Margarella Thiele 1893P61 [=Margaritella Thiele in Troschel 1891 non Meek & Hayden 1860KC60; Margarellinae]
| i. s.: M. antipoda (Hombron & Jaquinot 1854)P61 [incl. Chrysostoma roseaF27]
| M. fulminata (Hutton 1873)P61 [=Chrysostoma fulminataF27, Gibbula fulminataF27]
| M. hinemoa Powell 1955P61
| M. macquariensis Hedley 1916P61
| M. puysegurensis Powell 1939P61
| M. rosea (Hutton 1873) [incl. M. decepta Iredale 1908]P61
| M. turneri Powell 1939P61
|--M. (Margarella)KC60
| |--*M. (M.) expansa (Sowerby 1838)BR17 [=Margarita expansaBR17, *Margaritella expansaKC60, Trochus expansusKC60]
| `--M. (M.) violaceaP61 [=Margarita violaceaF27]
|--M. (Promargarita Strebel 1908)KC60
| `--M. (*P.) tropidophoroides (Strebel 1908) [=Margarites tropidophoroides]KC60
`--M. (Submargarita Strebel 1908)KC60
`--M. (*S.) impervia (Strebel 1908) [=Margarites impervia]KC60
*Type species of generic name indicated
References
[BR17] Bouchet, P., J.-P. Rocroi, B. Hausdorf, A. Kaim, Y. Kano, A. Nützel, P. Parkhaev, M. Schrödl & E. E. Strong. 2017. Revised classification, nomenclator and typification of gastropod and monoplacophoran families. Malacologia 61 (1–2): 1–526.
[F27] Finlay, H. J. 1927. A further commentary on New Zealand molluscan systematics. Transactions and Proceedings of the New Zealand Institute 57: 320–485.
[KC60] Knight, J. B., L. R. Cox, A. M. Keen, R. L. Batten, E. L. Yochelson & R. Robertson. 1960. Gastropoda: systematic descriptions. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt I. Mollusca 1: Mollusca—General Features, Scaphopoda, Amphineura, Monoplacophora, Gastropoda—General Features, Archaeogastropoda and some (mainly Paleozoic) Caenogastropoda and Opisthobranchia pp. I169–I331. Geological Society of America, and University of Kansas Press.
[P61] Powell, A. W. B. 1961. Shells of New Zealand: An illustrated handbook 4th ed. Whitcombe and Tombs Limited: Christchurch.