Marionia elongoviridis

Marionia elongoviridis is a species of sea slug, a dendronotid nudibranch, a marine gastropod mollusc in the family Tritoniidae.

Distribution
This species was described from Culebra Island in the Verde Island Passage, Philippines, 13.63018°N, 120.94725°W. It has been reported from Pulau Sangeang, -8.18282°N, 118.98663°W, Indonesia.