marine sponges or coralline sponge on white background

ancient animal aqua aquatic asexual base botanical branch cells choanoflagellata class clipping closeup collagen collar coral coralline currents deep demospongiae extract floral fragile fused invertebrate isolate later marine natural nature nautical nerves ocean paths phylum plant pores porifera reef reefs reproduction rock sclerospongiae sea seawater sponge sponges structure tentacle tropical tube tubular undersea underwater water white