20 mm long, found under a cobble in a tide pool.
Underside of a low intertidal cobble, with two of their egg masses. The larger slug here measured about 30 mm long.
6 Thick-horned nudibranchs were converging on the pair.
https://www.youtube.com/watch?v=cgcimuP1oVc&feature=youtu.be
Short video clip:
Observation was picked up using an ekman grab on the wetdeck of the SB Natural History Museum Sea Center, photographed using a 10x or 20x macrolens attached to cellphone.
8.5 mm long, found with its egg masses on a colony of the ctenostome bryozoan Amathia verticillata. 4th image shows a newly hatched veliger larva, right ventro-lateral view, with a shell 110 microns long.
So small and cute hard to belive these are living things 🤔
The only one 6 of us saw in a few hours if searching a small area.
about 1/16 th inch long. One of only 3 seen today.