Placochelys looked remarkably similar to a sea turtle, possessing the same flippers (albeit with short toes), flat but knobbly shell and compact skull.

• 铠甲楯齿龙外表非常类似海龟，牠们拥有类似海龟的鳍状肢、平坦但有瘤状物的甲壳、以及结实的头颅。