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It's a slug, it's a fish, it's – Phylliroe!
by KindMeal.my, 30 November 2015
It's a slug, it's a fish, it's – Phylliroe!

Phylliroe looks like a fish, moves like a fish, hunts like a fish. So what is it? Ladies and gentlefolk, it’s a slug. If ever you need evidence that the world is huge and nature is crazy, a fish-shaped slug is it.

Meet Phylliroe, the swimming fish slug that can reach up to 5 cm in length. To be more precise, Phylliroe is a type of sea slug known as a nudibranch, and is about the size of a goldfish. It’s cousin to the much-loved sea bunnies and strawberry-smelling Melibes. Nudibranchs get pretty crazy in both pattern and shape, but Phylliroe takes the cake. So why does Phylliroe look so fish-like? In order to answer that question, we’ve first got to learn a little bit about this sly slug. Phylliroe’s ancestors long ago left the sheltered seafloor, evolving into open ocean hunters out for blood, or, if we’re being scientifically accurate, out for jelly.

Yep, this fish-shaped nudibranch noshes on jellies, like in the picture above. It likely uses those long horns, called rhinophores, to sniff out the scent of unsuspecting jelly prey. To hold onto jellies, Phylliroe uses a remnant of its old sea-floor slug days: its foot. Most slugs, whether land or sea, have a long slimy body that sticks to the ground. The crawling surface of this body is called the foot, and for most slugs the slow creep of this foot is what propels them forward. But Phylliroe’s body is different; it swims with a fish-like tail now, and its foot is mostly gone except for a little remnant right near its mouth. When Phylliroe tracks down a jelly it uses this tiny slug foot to stick to it, then slurps it up–one helpless tentacle at a time. Once consumed, this meal passes through the digestive tract, which is powered by digestive glands–those white zigzag lines in Phylliroe’s otherwise clear body. And when it’s done digesting? Phylliroe defecates from an anus located in the middle of its right side. Because why not?

Think Phylliroe can’t get stranger? Guess again. Phylliroe glows. It is one of the few nudibranchs known to produce its own light, and apparently this light is exceptionally bright and beautiful, though few have seen it. The ancestors of Phylliroe not only evolved to look and swim like fish, they also developed the ability to bioluminesce, something very few other sea slugs can do.

But the question remains: why does Phylliroe looks so fish-like? What’s the deal? It’s hard to say for sure. Very few people have studied Phylliroe, so we have to make some guesses. Maybe the fish shape is a clever disguise. Maybe lady Phylliroe find gentlemen Phylliroe most sexy when they’re most fishy. Both open ocean fish and Phylliroe are fast-moving predators living in a watery world. It doesn’t matter if you start with a slug body or a dumpy guppy body; in this environment if you want to hunt down your prey you gotta get quick. And so over time, in the ancestors of both open-ocean fish and Phylliroe, the slow pokes were weeded out, and all but the sleekest and most agile remained, with streamline low-drag bodies and paddle-like tails. Two different animals, a slug and a fish, living in the same environment and hunting in similar ways evolved similar body types for similar functions. At least, that’s one guess. Functional convergences like these are all around us–they’re fascinating to think about but difficult to test. When it comes to Phylliroe, it’s hard to know anything for sure.

We are making new discoveries about the marvels of marine life every day. We are so far from understanding the ecosystems of our oceans, yet we're so quick to wreak havoc upon them, both by pollution and by over-fishing. The only thing we are sure about is this: When the oceans die, we will die with them. Want to do your part in saving the seas? Reduce (or eliminate!) the amount of seafood you eat.

For meals in Malaysia that are plant-based – no fish, slugs or Phylliroes whatever – go to http://KindMeal.my.

Source: http://goo.gl/S4x9Hp « Back To Articles