| protomonostroma undulatum | | usa: alaska, avatanak island, north side | | 2055749598 |
| protomonostroma undulatum | | usa: alaska, cook inlet, knoll head | | 2026800078 |
| protomonostroma undulatum | | usa: alaska, shaw island | | 2026800077 |
| protomonostroma undulatum | | USA: Alaska, Katmai National Park, Shaw Island | | 111610350 |