1、Lystrosaurus was a herbivorous mammal-like reptile that lived during the Middle Triassic period.
脊椎动物——Lystrosaurus是一种草食性哺乳类爬行动物，生活在三叠纪中期。

2、Lystrosaurus fossils are often found in large numbers, indicating that they were abundant and widespread during their time.
大量的Lystrosaurus化石表明，它们在当时非常丰富和广泛分布。