Redline Flabellina (Coryphellina rubrolineata) セスジミノウミウシ
A Redline Flabellina working on a hydroid. They can also sting. Amami 2025
Redline Flabellina has a red line down the back and one on each side. Sometimes they can be dashed. Amami 2025
The Redline Flabellina can have some variation in color with some purple ones. Amami 2025