Tritonia hombergii is the biggest nudibranchs we have up here in the north. It can grow up to 20 cm and can be found eating and hiding among the Dead-man’s finger (alcyonium digitatum). Up here in Saltstraumen it is very commonly found at Ørneset and Oksebåsen, from shallow to depth around 40 m.
This nudibranchs is the only one in our water you should be careful around as it can hurt you. The back is covered with rounded tubercles and these can exclude a irritating compound that can harm you.