Diadectes was a big fully terrestrial animal, classed as an amphibian. It is important in being the earliest-known vegetarian amphibian. It was one of the largest animals of its time. Jaw material of a similar animal has recently been found in early Carboniferous rocks of Tennessee.(walking dinosaur costume)
Features:The skeleton, built for terrestrial living, is very much like that of a reptile, but the skull shows that it is not a member of this group. The teeth are short and adapted for grinding tough food, and set in powerful jaws. The teeth at the front are pig-like and were used for nipping off mouthfuls of vegetation, and those at the back are flat like molars, used for grinding. The limbs stick out sideways, and the bones of the foot are simplified to minimize the stresses involved in moving its great weight with the resulting sprawling posture.(animatronic dinosaur model)
The rather pig-like appearance of Diadectes is the result of the broad body needed to house the digestive system that would cope with a vegetarian diet.
The amphibian lifestyle involves spending the early part of life in a watery environment, as an aquatic organism, and then emerging on to dry land as a fully formed animal. The amniote does this, but the water phase takes place inside an egg – the individual’s own private pond. The shell of the egg is made of mineral or leathery substance and allows oxygen in and carbon dioxide out. It is able to retain the water inside the egg, and is tough enough to protect the contents.(dinosaur equipment)
-Three important membranes line the inside –
-The amnion that encloses the embryo with a water fluid.
-The chorion that encloses a bag of food – the yoke.
-The allantosis that encloses a cavity for solid waste.
The embryo must be fertilized before these shells and membranes develop, and so fertilization takes place within the female s body. This is the origin of intimate sexual intercourse – something absent from the lifestyle of fish and amphibians.