| Species name | Common name | Distribution | Max. Length (cm) |
|---|---|---|---|
| Neosimnia advena (Cate, 1978) |
Western Central Atlantic | ||
| Neosimnia aequalis (Sowerby II, 1832) |
Southeast Pacific | ||
| Neosimnia avena (Sowerby II, 1832) |
Eastern Pacific | ||
| Neosimnia barbarensis (Dall, 1892) |
Santa Barbara simnia | East Pacific | |
| Neosimnia bellamaris Berry, 1946 |
Pacific simnia | East Pacific | |
| Neosimnia bijuri (Cate, 1976) |
Atlantic Ocean | 1.45 | |
| Neosimnia loebbeckeana (Weinkauff, 1881) |
Loebbeck's simnia | Eastern Central Pacific | |
| Neosimnia spelta (Linnaeus, 1758) |
Eastern Atlantic |