Knoutsodonta
depressa (Alder & Hancock, 1842)| Date: | 12 July, 2021 |
| Location: | Ton Braighe, North Rona off the north west coast. |
| Approx size: | 10 mm |
| Depth: | 15 metres. |
| Water temperature: | 10°C. |
| Other info: | Sony α6000 in Nauticam housing, Zeiss 50 mm macro lens and 2 x Inon D-2000 flashes. |