Kelpland Medusae

Featured Article — 39-2025
Many of the massive kelp forests of Neptune are actually simple invertebrates known as Kelpland Medusae. Much like the kraken-whales, Kelpland Medusae can grow large enough to become unique ecosystems by themselves. However, most kelplands consist of several medusae drifting together.   Kelpland Medusae are usually female or hermaphroditic, as male medusae do not grow as large. Medusae are believed to be effectively immortal. As long as they are protected from predators and given sufficient food, they show no signs of aging or deterioration.   Medusae do not seem to intentionally participate in the aural soundscape of the ocean. Their movement produces some noise, but they do not have phonic lips or any other instrument to communicate with. Their presence is often communicated by other creatures in and around the Kelplands.  

Anatomy

The Kelpland Medusae consist of a hollow crown that contains most of their organs, and a trailing set of tentacles. The crown is the core of their body. It is a hollow bell-shaped structure made of a jelly-like substance. Some medusae have additional stalks that extend from the crown, to either attach to a substrate (in the case of stalked medusae), or to extend their reach (in the case of canopy medusae).   Kelpland Medusae have three kinds of tentacles. The most plentiful are the fronds which form the forest and offer safe habitation and a substrate for other creatures. Stingers can be found hidden among the fronds, long thin tentacles that stun creatures. At the core of the kelplands are extended lips called oral arms. These tentacles resemble beautiful draperies, and are often a different colour to the fronds.   Medusae are carnivorous, and provide shelter in return for a population tax. When medusae catch something in their oral arms, they begin digesting them as they transport them up to the mouth. The mouth of the medusae is at the center of the crown.  
Three kinds of medusae can grow large enough to become kelplands.   Canopy Medusae are the best known of the kelpland medusae, as well as the largest. These medusae float along the surface of Neptune. They use gas-filled bladders at the canopy of the forest to maintain buoyancy. They often comingle with algae kelplands.   Bell Medusae are found deeper in the ocean and swim by expanding and contracting their bodies to push water behind them. Often several bell medusae will get tangled into eachother and form a larger biome.   Stalked Medusae attach themselves to Falls, kraken-whales, icebergs and other large underwater structures. These medusae are often deliberately cultivated aboard the Falls.  

Living Biomes

Kelpland Medusae are important ecosystems. They provide stability for nesting, protection for prey, and hunting grounds for predators. There are many creatures entirely adapted to life in the kelplands, whether they blend in to the fronds, or cling to them to catch their next meal. People also live in the kelplands, using the fronds to moor their homes, or even weaving their homes from the fronds themselves.   Medusae are not intelligent enough to be truly domesticated or tamed, but they can be made safer. Those who live in or by the Kelplands often cut and collect the stinger tentacles. Removing the stingers is known as cropping, and once a medusae has been cropped they will often need to be fed. The stingers are often used to create stinging nets.   Kelpland societies have a long and storied history with animal sacrifice. While few continue the ritualistic practices to this day, cropped medusae do still need to be fed. There has been evidence of ritual human sacrifice in the distant past during particularly rough times. In the Still Seas, a region of Neptune nested in a gyre between four currents, dead are fed to the medusae as a common burial practice.  

See Also


Neptune
Locations Fall ( Albino Palace )
Characters Venilia VII · Blue NM-2 · Fritz Fram · Duwana · Thauma Magallana
Society Humanoids ( Oceanid ) · Traditions ( Symbiosis ) · Organizations ( Sentinel )
Conservation Status
Conservation Dependent (CD)
Geographic Distribution
Choral Type
Non-musical
Notice: This article is a stub. It may be expanded later!


Cover image: Canopy Medusae by Annie Stein

Comments

Author's Notes

Feature Friday 39-2024   What can I say, I like scaling creatures up! The name medusae is taken from what we call the lifestage of the jellies where they float around. It's fitting that it's also the name of the gorgon. I named this hoping kelpland would help convey the scale of these creatures, but it might just be read as the biome they're found in. Works either way, really!   Also shoutout to Mochi who bribed me to brainstorm some more critters! The medusae were one of the critters I drew back in May.


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Jul 22, 2024 09:31

Bell medusae getting entangled is like a considerably cuter rat king.

"Visit Ayonerra. Your Khelmtsiphe demands it!"
Jul 22, 2024 09:35 by Annie Stein

it's like they're holding hands!

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Jul 22, 2024 15:23 by Aster Blackwell

Obsessed with the image of living in an underwater forest that's just one massive living creature.

I just think you're neat!   Check out SanZera or support me on Ko-Fi!
Jul 22, 2024 21:15 by Annie Stein

Thank you, I am too! I think my favourite tibit might be people weaving homes in it too.

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Jul 22, 2024 23:51 by Dr Emily Vair-Turnbull

Obsessed with this idea. Really nice touch with the idea of cropping the stinging tentacles, and the fact that doing so means inhabitants will have to manually feed the medusae.

Emy x
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Aug 6, 2024 10:55 by Annie Stein

Thank you! It felt like a very natural thing to include once I started thinking about the logistics of living in a place like this!

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Jul 27, 2025 15:27 by Keon Croucher

I do not know why I had not seen them yet, but I love them!!!! Amazing idea nnie, such a fascinating and fantastic creature!!

Keon Croucher, Chronicler of the Age of Revitalization
Jul 28, 2025 10:21 by Annie Stein

Thank you so much!

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