Goniobranchus tasmaniensis

Goniobranchus tasmaniensis is a colourful sea slug characterized by its translucent white mantle adorned with scattered orange or red spots. The mantle's edge is opaque white and appears somewhat swollen and ruffled when the animal is at rest. This species can be distinguished from similar nudibranchs such as Goniobranchus splendidus, Goniobranchus hunterae, and Goniobranchus daphne, which share similar coloration but have distinct features. Originally described from Tasmania, Australia, it inhabits the waters of south-eastern Australia, where it is part of a mimicry ring with other red-spotted chromodorids. The species is typically found in diverse marine environments, although specific habitat details are not provided in the sources.  It primarily feeds on the sponge Darwinella gardineri, showcasing its role in the marine ecosystem. Breeding habits are not detailed in the sources, but nudibranchs are generally known for their hermaphroditic reproduction. Encountering this nudibranch during a dive can be a visually interesting experience due to its unique coloration and patterns.  The conservation status of Goniobranchus tasmaniensis is not specified in the sources, and its rarity is also not mentioned.