Type species: Emma crystallina Gray, 1843
This genus includes the species:
| Emma buskii | (Wyville Thomson, 1858) | Recent | Australia |
| Emma cervicornis | MacGillivray, 1869 | Recent | Australia, New Zealand |
| Emma crystallina | Gray, 1843 | Recent | New Zealand |
| Emma rotunda | Hastings, 1939 | Recent | Australia, New Zealand |
| Emma triangula | Hastings, 1939 | Recent | Australia, New Zealand |
| Emma tricellata | Busk, 1852 | Recent | Australia, New Zealand |
| Emma watersi | Hastings, 1939 | Recent | Australia |
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| Emma buskii | Emma cervicornis | Emma rotunda | Emma triangula |
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| Emma tricellata |