This is the true story of a parasitic flatworm called Curtuteria australis. This mysterious body-snatching organism lives within multiple hosts in its own life-cycle. The story of how that happens is simply unbelievable, but true. Here’s an analogy.

Body Snatching Parasites: Curtuteria Australis

Curtuteria, or Curt because it’s easier to write, doesn’t have an easy life.
Curtuteria Doesn't Have An Easy Life
What Happened Soldier?
Abort Mission!
Curt is born as a larval worm inside the belly of an oystercatcher bird. Naturally, he soon finds himself in the faeces of the bird.
Landing Module AKA Oystercatcher Bird Turd
And is delivered smartly onto the ground of the New Zealand mudflats.
A Perfect Landing
Safely landing within the bird-turd – I mean, state-of-the-art space vessel – Curt and his siblings hatch.
Scouting The Mud Flats

That’s where the easy ride ends. Almost immediately, they are eaten by whelks. If you’re not up to speed with your marine taxonomy, whelks are an apparently delicious type of sea snail.

Whelks Consuming Curtuteria Australis, Obviously
It Was Dark and Cold
You Were Inside The Monster's Gut?

Good question, Sergeant. The answer lies in the second stage of Curtuteria’s bizarre life-cycle:

Because that’s how Curtuteria Australis does business.

Next, still in the belly of the whelk, Curt cocoons up and undergoes asexual reproduction to create free-swimming baby worms. Curt, in his new baby worm form, is released out the anus of the whelk. Into the ocean.

Ever Taken a Dump in The Ocean?
Swept Away By The Tides

Have you ever tried to survive being eaten and shat out, only to be carried away by the tide to die?

Then Things Got Bad
The Kraken
Now when I say Kraken, I’m actually talking about a type of shellfish called a cockle (Austrovenus stutchburyi).  Not above ingesting the anal excrement of a sea snail, the cockle happily sucks in Curt with its inhalant siphon. Neat.
Inside The Kraken
How Did You Survive?
Simples: Curt migrates down to the cockle’s foot, and begins to burrow into it.
Further Deep Inside The Kraken's Lair
You’d think you’d be relatively safe living inside the cockle’s foot, no? I mean, it’s not exactly going to attack his own foot to spite you, is it?
Fortunately, no. But then this happens.
Shark Attack
Who knew that the tip of the cockle’s foot is a typical snack for the foot-cropping Spotty fish, Notolabrus celidotus?
How to Survive Life in a Cockle
A Fiendish Predicament
Sabotage!
Good Grief, Hell No, Soldier
We Hardened Our Bunkers (Not a Euphemism)
In other words, they form cysts, and the clever little Curts render the cockle’s foot useless. For a cyst-filled foot can no longer dig into the sand. Success! The cockle is beached!
The Kraken is Beached!
Did I Mention There Was a Dragon?
Of course, you realise the dragon is an oystercatcher bird. Having been eaten by the oystercatcher, Curt ends up back inside the belly of the bird.
Home Sweet Mothership
Curtuteria Australis: The Most Stupidly Complex Life-Cycle Ever
And the stupidly complex and high-risk life-cycle of Curtuteria australis can start anew.
Source:

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