Probably the most unusual animal on today’s dive was a large (10.0 centimeters in length) brown nudibranch in the genus <em>Bathydoris</em>. Opisthobranchs are seldom observed from abyssal depth, making this a very unusual occurrence.

Probably the most unusual animal on today’s dive was a large (10.0 centimeters in length) brown nudibranch in the genus Bathydoris. Opisthobranchs are seldom observed from abyssal depth, making this a very unusual occurrence. Image courtesy of the NOAA Office of Ocean Exploration and Research, 2017 Laulima O Ka Moana.

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