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Nudibranch; St Vincents

Nudibranch; St Vincents

Hypselodoris saintvincentius

Saint Vincent’s Nudibranch is endemic to the regions of South Australia and South West Australia. It is likely that this species is a regional variation of Hypselodoris infucata which is widely distributed throughout the tropical Indo-West Pacific. Saint Vincent’s nudibranch has a light greyish blue body with darker blue patches. A pattern of white and yellow dots also speckle the body. The rhinophores and gills are red. A major difference between H. infucata and H. saintvincentius is that in the latter the gills appear fuller and often have a white line up the basal half of the outer edge of the gill. Saint Vincent’s nudibranch grows to a maximum length of about 5cm and is likely to feed on certain species of sponge.

Occurrence at the Busselton Jetty:   

Saint Vincent’s nudibranchs are often seen crawling across the windows of the Observatory near the seafloor. They appear to be more commonly sighted during the warmer months of summer.

Image by: S. Teede