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Marionia arborescens  Bergh, 1890

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Marionia arborescens is characterized by its greenish-brown body, densely coverd with tubercles, which are darker oulined.
Let me quote the description in IPN at page 337: "Body greenish brown with dense, prominent tubercles covering the notum. Tubercles outlined basally with dak brown pigment. Opaque white covers some of the tubercles. Velar tentacles are simple. Secondary gills highly ramified."
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426 pp. ,
The gills seem to be very variable in colour, ranging from translucent white to greenish-brown, and to turquoise.
The identification was confirmed by David W. Behrens, thanks!
This picture shows a specimen upon its violet egg mass