Scuba dive at Yukon, Dec 11, 2016
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cabezon Scorpaenichthys marmoratus

this cabezon was unusual with a lot of white coloration

a closer look at that cabezon
Scorpaenichthys marmoratus

slug Flabellina iodinea

a good look at its head, showing (from the front) its mouth (with scraping radula inside), its two long purple oral tentacles (sensory organs), its two reddish rhinophores with the white blazes (perhaps used for finding food and a mate), and its orange cerata (used for respiration and, in some nudibranchs, defense). I think the pores at mid-body are for access to reproductive organs.

painted greenling Oxylebius pictus

slug Hermissenda opalescens

scalyhead sculpin Artedius harringtoni

not sure about this ID; it doesn't look like a painted greenling or a sarcastic fringehead

slug Flabellina trilineata

slug Flabellina trilineata

showing its freshly laid eggs

brown cup coral Paracyathus stearnsi

on blue encrusting sponge