通称：盗首螈
物种：盗首螈目
时代：二叠世
食性：食鱼动物
性情：易惊型
野生
通常独自栖息在岛屿的沼泽之中，盗首螈是一种小型的两栖动物，主要摄食小型鱼类。在我看来它应该处在食物链的中下层，以捕食小型非昆虫生物为生，自身也成为大型食肉龙的开胃点心。 也正是因为诸多生物捕食它，所以盗首螈也变得非常容易受到惊吓，通常一点点风吹草动就能让其迅速逃离。凭借自身两栖动物的特性，它会逃到猎食者不适应的场所。 盗首螈拥有储存大量氧气的独特特性，能够让其一次在水下潜入数小时之久，这甚至比其他想要猎食它的两栖动物还要久。
家养
驯化后的盗首螈用途很少。主要还是将其用作氧气袋来用（有点恶心），盗首螈将空气储存在头部的气囊内，潜水者可以在水下从这些气囊内吸取氧气，使得他们能够在水下进行长时间的探索而不需额外的装备。 很让人意外的是，盗首螈还非常擅长捕猎三叶虫。
Common name: Diplocaulus
Species: Diplocaulus natatorinutrix
Time: Permian
Diet: Piscivore
Temperament: Skittish
Wild
Presiding almost solely within the Island's swamps, Diplocaulus natatorinutrix is a small amphibian that primarily eats minor fish. It rounds out what I consider to be the middle-bottom of the ecosystem, feeding on the tinier non-insect creatures of the Island while itself being a common snack for the larger carnivores. Because so many creatures prey on it, Diplocaulus has become very skittish and often flees at the first sign of trouble. It uses its amphibious nature to escape into whichever environment its predator isn't native to. Diplocaulus' unique capability to retain vast quantities of oxygen allows it to effectively remain submerged for hours at a time, usually outlasting even other amphibious creatures that might otherwise prey upon it.
Domesticated
There are only a few uses for tamed Diplocaulus. It is primarily kept for the (rather disgusting) practice of employing a Diplocaulus as an oxygen bag. Diplocaulus stores air in the bladders of its head, and divers can suck from these bladders to take deep breaths while submerged, supporting long-term underwater exploration without the use of external gear. Surprisingly, Diplocaulus is also extremely efficient when it comes to hunting Trilobites.
