To date, the most complete specimen of "L. antunesi" found is a partial skeleton. The holotype, ML 370, consists of the remains of six cervical vertebrae with six ribs, five sacral vertebrae with ribs, 14 caudal vertebrae, eight chevrons, both femora, right tibia and fibula, one metatarsus, two ilia and both pubes and ischia, as well as an associated 32 gastroliths. A femur (ML 555) found at Porto das Barcas (Lourinhã Formation; Late Jurassic) has also been referred to "L. antunesi".