Franco Banfi / Orange peel nudibranch (Tochuina tetraquetra), Alaska, United States, North Pacific Ocean.

Pascal Kobeh / Orange peel nudibranch (Tochuina tetraquetra), Alaska, USA, Gulf of Alaska. Pacific ocean.

Alex Mustard / Detail of the sensory rhinophore of an Orange peel nudibranch (Tochuina tetraquetra). Browning Pass, Vancouver Island, British Columbia, Canada. North East Pacific Ocean.

Fred Bavendam / Orange Peel Nudibranch (Tochuina tetraquetra) eating an Orange Sea Pen (Ptilosarcus gurneyi), British Columbia, Canada

Alex Mustard / Orange peel nudibranch (Tochuina tetraquetra) portrait, Browning Pass, Vancouver Island, British Columbia, Canada, Queen Charlotte Strait, Pacific Ocean.

Shane Gross / RF - Orange peel nudibranch (Tochuina tetraquetra) resting on a rock, Browning Pass, British Columbia, Canada, Pacific Ocean. (This image may be licensed either as rights managed or royalty free.)

Alex Mustard / Orange peel nudibranch (Tochuina tetraquetra) feeding on Red soft coral (Eunephthya rubiformis) with Short plumose anemones (Metridium senile). There is a second nudibranch behind the outcrop. Brownin...

David Hall / Orange peel nudibranchs (Tochuina tetraquetra) feeding on Red soft coral (Gersemia rubiformis) which have retracted their polyps in defense, North Hanson Island, Johnstone Strait, British Columbia, Ca...