Taxon: ***Stenopterygius longifrons *(Owen, 1881)** - **Ichthyosaur**
**Time period**: [Lower Toarcian, *Harpoceras falciferum* biozone](https://en.wikipedia.org/wiki/Toarcian) (183 million years ago)
**Collection location: **[Bettembourg or Sanem, Luxembourg](https://www.openstreetmap.org/search?query=Dudelange%2C%20Luxembourg#map=12/49.5046/6.0116)
**MnhnL collection number:** TU332a
The original specimen of this fossil is kept at the palaeontological collection of the [Luxembourg National Museum of Natural History (MnhnL)](https://www.mnhn.lu/) in Luxembourg.