Colloblasts are adhesive cells found on the tentacles of ctenophore.

they both live in the darkness and have tentacles

the Porifera, Cnidaria, Ctenophore, Platy helminthes, and Nematode phylums all exchange gas and eliminate waste through diffusion. They tend to be small and/or have a large surface-to-body ratio.

The scientific name for comb jellies is Ctenophora.

Examples for diploblastic animals are the following:

The members of phylum:

cnidarians and phylum ctenophore are diploblastic

Cnidarians include hydra, jellyfishes, corals, sea pen, sea fan, sea anemones, obelia, physalia, etc.