Published: July 16, 2025
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Big news! Our study, just out in @Nature, is a game-changer for giant ichthyosaurs! We describe the 1st Temnodontosaurus flipper with fossilized soft tissue, giving us a unique look at how these massive creatures used stealth while hunting in darkness. 1/8 #science #NEWS #Scicomm

Image in tweet by Sven Sachs

The nearly 1m-long front flipper, found in 2009 by Georg Göltz in Dotternhausen, #Germany, is Lower Jurassic in age. It preserves a serrated trailing edge with unique rod-like structures we've named 'chondroderms.' 2/8 #paleontology #biologybreakthrough

Image in tweet by Sven Sachs

Temnodontosaurus was the largest megapredator of the Lower Jurassic (more than 10 m long). The flipper lacks bones at the distal end, which show that the soft-tissue flipper was much longer than the bones indicate. 3/8

Image in tweet by Sven Sachs

This, together with the flipper's wing-like shape and serrated edge, collectively indicates that this morphology helped the massive animal to minimize sound production during swimming. 4/8

Image in tweet by Sven Sachs

Temnodontosaurus had the largest eyes of any vertebrate known, which support the hypothesis that this aquatic reptile hunted under low-light conditions. 5/8

Image in tweet by Sven Sachs

I'm incredibly grateful to the finder, Georg Göltz, for contacting me, allowing its description, and donating this significant specimen to the Palaeontological Museum in Nierstein, Germany. 6/8

Huge thanks also to project leader Johan Lindgren, and my co-author @Dean_R_Lomax, with whom I picked up the specimen from Georg and to @JoschuaKnuppe for the fantastic palaeoart! 7/8

Here’s a link to the publication: https://www.nature.com/article... 8/8

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