Jurassic fail: fish accidentally snags pterosaur, and both die

By Ed Yong | March 8, 2012 9:00 am

“Get off!” “No, YOU get off!” “Okay, we let go on three. One… tw…” “Wait, wait, is that one, two, three and then we let go, or one, two, let go?” “One, two, let go.” “Okay, okay. One… two…” And they both died.

Here is a fatal accident, etched in stone. This fossil comes from Solnhofen in Germany and dates back to the Jurassic period. On the left is Rhamphorhynchus. It’s a pterosaur – one of many flying reptiles that flapped through the skies while the dinosaurs ruled the land. Its arm bones, which supported its leathery wings, stretch out to the left of the image, while its long, stiff tail points downwards. On the right is Aspidorhynchus, a predatory fish with a long, pointed snout.

On first glance, you might think that the fish tried to eat the pterosaur. But Eberhard Frey and Helmut Tischlinger have been studying the fossil in detail, and they think otherwise.

They analysed four slabs of Solnhofen limestone, each containing a Rhamphorhynchus entangled with an Aspidorhynchus. In each slab, one of the pterosaur’s wing bones lies within the jaws of the fish. In most of these cases, it’s hard to work out what happened. The pterosaur might well have been dead – perhaps it fell to the ocean and was grabbed by the fish.

But one of the slabs – the one in the image above – provides an important clue. The Rhamphorhynchus has a small fish lodged in its throat. It had just caught its prey and had started to swallow it. This animal was very much alive when Aspidorhynchus snagged it. But not for long – Rhamphorhynchus was probably pulled underwater and drowned. But the encounter was fatal for Aspidorhynchus too. Its skull wasn’t flexible enough to cope with large prey, and the pterosaur was too big and bulky for it to swallow.

It probably couldn’t get rid of its victim either. The pterosaur’s left wing bones are distorted, while the rest of its skeleton is intact. Frey and Tischlinger think that the fish tried to shake off its unwanted morsel, clearly to no avail. Perhaps the tough fibres in Rhamphorhynchus’s wing snagged in Aspidorhynchus’s  tightly packed teeth. With neither party able to break free, both died.

There’s no evidence that Aspidorhynchus ever actually tried to hunt Rhamphorhynchus. Even though several fossils show the two of them locked in a fatal embrace, not a single one shows the pterosaur’s bones inside the fish’s stomach. Instead, Frey and Tischlinger think that these fossils depict unfortunate but common accidents.

Rhamphorhynchus was a fisherman, skimming over the water surface and grabbing fish from above. The commotion would have drawn Aspidorhynchus from below, for it probably targeted the same prey. All it had to do was to raise its head in the wrong place to snag the wing of its final meal.

Reference: Frey & Tischlinger. 2012. The Late Jurassic Pterosaur Rhamphorhynchus, a Frequent Victim of the Ganoid Fish Aspidorhynchus? PLoS ONE http://dx.doi.org/10.1371/journal.pone.0031945

Comments (8)

  1. HP

    Ramphorhynchus took Aspidorhynchus for a ride in the air
    Aspidorhynchus thought that everything was on the square
    Ramphorhynchus tried to throw the fishy off of his back
    The fish grabbed Ramphorhyncus and said, “Listen, Jack —

    “Straighten up and fly right,
    “Straighten up and do right,
    “Straighten up and fly right,
    “Cool down, papa, don’t you blow your top!”

  2. Muz

    Incredible!
    and totally cool.

  3. Jumblepudding

    Did the fish in the Pterosaur’s throat have another, smaller fish in its throat? This reminds me of food chain friends.

  4. Martin B

    A smaller fish in the throat of the next bigger may be a food chain, but they are hardly friends. LOL.

    Cool fossil too.

  5. Jaimz Bng

    Did this event happen very fast our very slow?

  6. mfumbesi

    @HP and Jumblepudding I LOLed.
    Thanks for the imagery.

  7. Nathan Myers

    When I look at this, I see a R. with a newly-snatched morsel in its claws that an A. wants badly enough to jump for, but gets tangled up with the R. instead.

  8. Josquine

    Survival of the fittest – neither of these was, both distinctly dysfunctional!

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