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Pretty similar is Ercolania sp. 4 which differs by the unrolled rhinophores.
The original description of Stiliger smaragdinus is from Japan, now there are records from many locations,
from West to East: from Bali Island, Indonesia, Singapore, Australia, and from the Marshall Islands , to Hawaii. Apte et al. (2016) extend the range
of S. smaragdinus to India far westwards from its present distribution.
The correct generic placement of this species is not clear, Kathe Jensen is "preparing a description of a new genus for it" that was 20 years ago (1997).
Apte D.A, Kamboj R.D & Bhave V. (2016). First record of Stiliger smaragdinus Baba, 1949 (Mollusca: Sacoglossa: Limapontiidae) from India.
Journal of Bombay Natural History Society 112 (2): 114-117.
More information on Stiliger smaragdinus are on Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2017), published 22 October 2017, Stiliger smaragdinus Baba, 1949
available from https://www.Philippine-Sea-Slugs.com/Sacoglossa/Stiliger_smaragdinus.htm