Glossodoris rufomarginata, commonly called white-margin sea slug or caramel nudibranch, is a species of colorful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
Glossodoris rufomarginata has a commonly observed length of 3.5 cm, with a maximum length of 5 cm. The background coloration of the entire body is whitish with on the foot and the dorsal surface speckled with a dense coat of tiny red dots to orange-brown that gives the impression at first glance that the animal is brown. The edge of the mantle is well developed and wavy with a broad white band with a red to orange-brown outer border. The foot has also a white external margin. The rhinophores and branchial plume are retractable with a red to orange-brown coloration with a white median line on rhinophores and a white highlight on the gills axes.
Distribution and habitat
This species occurs in the tropical waters of Indo-Pacific area. It has been observed in localities as far distant from one another as Tanzania in Africa, Mayotte, but it occurs mainly from Sri Lanka to Polynesia and Hawaii., This nudibranch can be observed mostly on reef and rocky areas in sheltered as in exposed environment but with a preference for area in the shade.
- "Archived copy". Archived from the original on 9 October 2014. Retrieved 29 September 2014.
-  Sea Slug Forum Messages, accessed 14 December 2009.