What is more, the Malagasy fossil assemblage lacks remains of several younger reptile groups usually found with the earliest dinosaurs, including the heavily armored, crocodilelike phytosaurs and aetosaurs.

• 此外，马达加斯加的化石组合中，缺乏爬行类比较年轻的种类，例如形似鳄鱼的植龙与鹫龙，身体都有厚重的甲胄保护，通常与早期恐龙一齐出土。