True jellyfish of Class Scyphozoa lack a velum, whereas Turritopsis dohrnii has a velum.
Sources
- Immortal Jellyfishes, Turritopsis dohrnii (marinebio.org)
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6160850/ (ncbi.nlm.nih.gov)
- https://lanwebs.lander.edu/faculty/rsfox/invertebrates/gonionemus.html (lanwebs.lander.edu)
- https://animaldiversity.org/accounts/Scyphozoa/ (animaldiversity.org)
- http://comm.archive.mbl.edu/BiologicalBulletin/KEYS/INVERTS/3/Dscyphozoakeys.htm (comm.archive.mbl.edu)
- https://www.sciencedirect.com/science/article/pii/S2405580823001942 (sciencedirect.com)
- https://www.newworldencyclopedia.org/entry/Hydrozoa (newworldencyclopedia.org)
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