This Bizarre Sea Worm Branches Like a Tree, And Each Segment Has Its Own Butt

by akoloy

Nature is so bizarre. You can have worms residing within the deep sea which can be completely butt-free… whereas in reef-dwelling segmented worms whose our bodies department like a tree from its head, every department ends in a separate butt.


This species is known as Ramisyllis multicaudata, and it is probably the strangest worm on the planet. It was first found in 2006, and formally described in 2012. Now, for the primary time, scientists have performed an in depth research of its anatomy, lastly revealing extra about this enigmatic creature – and elevating much more questions on the way it lives its weird life.

“Our research solves some of the puzzles that these curious animals have posed ever since the first branched annelid was discovered at the end of the 19th century,” said evolutionary biologist Maite Aguado of the University of Göttingen in Germany.

“However, there is still a long way to go to fully understand how these fascinating animals live in the wild.”

R. multicaudata appears to be the very embodiment of introversion. It lives symbiotically in sea sponges to shallow depths of 20 meters (66 ft) within the waters off the north coast of Australia, its head buried deep in its residing house.

As it grows, its bristled branching physique, with diameters round 1 millimeter, extends alongside channels within the sponge. Only the very ends of these branches – the worm’s many posteriors – stick out, giving the sponge a barely patterned look.

buttsR. multicaudata in a Petrosia sponge. (Glasby)

It’s a curious existence, and one which has puzzled biologists. The worm could be very fragile, and breaks aside very simply, making it terribly troublesome to dissect and research.

Nevertheless, after painstaking work utilizing a mixture of methods together with histology, digital optical microscopy, immunohistochemistry, confocal laser microscopy, and X-ray computed microtomography, a global crew of biologists has managed to check the ins and outs of R. multicaudata‘s anatomy.


By analyzing the worm enveloped inside the host sponge, they managed to indicate that the whole, complicated, branching worm is large, extensively filling the sponge’s canals and cavities. They additionally obtained three-dimensional pictures of the worms and their inner anatomy, in addition to the labyrinthine sponges they name house.

For the primary time, they have been capable of affirm that when the worm’s physique divides and branches, so too do its inner organs. Digestive tracts break up, and the worm’s guts run by the brand new branches in addition to the outdated.

Fascinatingly, this peculiarity requires an anatomical construction by no means earlier than seen in another animal – what the researchers have referred to as muscle bridges. These kind wherever the worm bifurcates, crossing between the break up organs.

The muscle bridges are additionally proof that the worm splits when it is mature, not as a juvenile, and can be used to trace which department was the unique and which one break up, which is helpful for understanding the animal’s development.

worm faceLook on the tiny face (backside left)! (Ponz-Segrelles & Glasby)

When the worm desires to breed, it makes use of its branches to take action. A department tip will kind with gametes inside, referred to as a stolon; the stolon will detach from the mother or father worm to swarm and reproduce with different stolons earlier than dying, whereas the mother or father lives on.

In their research, the researchers have been capable of affirm that these stolons develop brains and eyes whereas nonetheless connected to the mother or father worm. Then, when the stolon breaks free, it’s fully autonomous, able to swim and breed.


However, there’s one thriller we nonetheless do not have a solution for: With only one head, buried deep in a sponge, how and what does R. multicaudata eat?

“This study has concluded that the intestine of these animals could be functional, yet no trace of food has ever been seen inside them and so it is still a mystery how they can feed their huge branched bodies,” Aguado said.

“Other questions raised in this study are how blood circulation and nerve impulses are affected by the branches of the body.”

All these butts, and the worm’s not even utilizing them… no less than, not in a approach that we will at the moment acknowledge.

Now that the groundwork has been laid, maybe future analysis can have a neater time understanding how R. multicaudata lives – and how on earth it advanced to turn out to be the bizarre approach it’s.

The analysis has been printed within the Journal of Morphology.


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