Nick Hawkins / Finger sponge (Isodictya sp.) growing in the depths off Bonaventure Island, Quebec, Gulf of Saint Lawrence, Canada. September.

Franco Banfi / Finger sponge (Isodictya quatsinoensis) Vancouver Island, British Columbia, Canada, Pacific Ocean

Franco Banfi / Finger sponge (Isodictya quatsinoensis) Vancouver Island, British Columbia, Canada, Pacific Ocean

Franco Banfi / Finger sponge (Isodictya quatsinoensis) Vancouver Island, British Columbia, Canada, Pacific Ocean

Fred Bavendam / Sponge (Isodictya sp) group underwater, Halfway Rock, Glouchester, Massachusetts

Shane Gross / Finger sponge (Isodictya quatsinoensis) and juvenile Widow rockfish (Sebastes entomelas) along with various anemone and coral species on a wall, Browning Passage, Queen Charlotte Strait, Vancouver Isl...