Tambja olivaria  Yonow, 1994

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Tambja olivaria is characterized by its 'olive' green background colour and pattern of black and orange-yellow markings. There runs an orange-yellow band around the anterior end, just in from the dark green edge, then runs back on each side to join behind the gills - parts of this band can be absent. This specimen is pretty damaged.
More information on Tambja olivaria are on Bill Rudman's Sea-Slug Forum!