A mini-poster of the principal nudibranchs (along with a large velutinid) and chitons that may be expected on biodiversity surveys in Gulf of St. Lawrence (GSL). Updated from a page of a series here: Nozères (2022) Mini-posters of macroinvertebrates in captures from bottom trawl surveys of the estuary and northern Gulf of St. Lawrence--update 2022-10-30.