Genus: Lorrainosaurus SACHS, MADZIA, THUY & KEAR, 2023
Etymology: In reference to Lorraine, where the specimen was found and Greek, sauros, “lizard”.

Species: keileni (GODEFROIT, 1994) SACHS, MADZIA, THUY & KEAR, 2023
Etymology:
= Simolestes keileni GODEFROIT, 1994

Holotype: MNHNL BU159

Locality: Montois-la-Montagne, Lorraine Department, France.

Horizon: Part of the Marnes de Gravelotte regional lithographical unit correlated with the upper Bajocian (mid-Middle Jurassic) Parkinsonian parkinsoni Zone.

Biostratigraphy:

Age: Upper Bajocian Stage, Dogger Epoch, Late Jurassic.

Material: Mandibular fragment, dentary fragment, teeth, fragmentary coracoid, phalange, ribs, fragmentary cervical vertebrae and fragments.