A mini-poster of the principal jellies and hydrozoans 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 2022-10-30Update version 2024-04-16. Added Modeeria rotunda, a rare kind of hydromedusa, previously mistaken for Aurelia medusa in GSL. See on iNaturalist: https://www.inaturalist.org/observations?place_id=any&preferred_place_id=6712&taxon_id=293218