Jawless Fish - an overview | ScienceDirect Topics 13 3 2 Jawless Fish (Agnatha) There are two groups (classes) that fall within the jawless fish category; these are the lampreys and the hagfish Members of this class do not have a stomach; however, larvae do have a flexible rodlike cord along their bodies called a notochord that supports it during its embryonic stage
The Rise of Amphibians: 365 Million Years of Evolution Recent, exciting new fossil findings have improved the picture of amphibian evolution and even parts of their developmental biology Therefore, Robert Carroll's new book The Rise of Amphibians is a timely review, providing a modern reference for amphibian paleontology and evolution
Digestive System of Amphibians, Reptiles and Birds The digestive systems of amphibians, reptiles, and birds share many characteristics with those of fish However, the transition of amphibians from an aquatic to a terrestrial environment, the development of endothermy in birds, and the adoption of a wider range of diets required a number of adaptations
List of threatened species of the Philippines - Wikipedia This is a list of threatened plant and animal species in the Philippines as classified by the International Union for Conservation of Nature (IUCN) It includes vulnerable (VU), endangered (EN), critically endangered (CR), and recently extinct (EX) species It excludes near threatened (NT), data deficient (DD), and prehistoric species [1]
Respiratory System in Vertebrates (With Diagram) | Chordata . . . In vertebrates the skin may be respiratory (e g , anurans), while in some fishes and aquatic turtles, the vascular rectum or cloaca is respiratory But there are two main types of respiratory organs- gills for aquatic respiration and lungs for aerial respiration Both gills and lungs may occur in the same animal Accessory respiratory organs are also present in some vertebrates In both kinds
Reproductive behavior | Definition, Examples, Animals . . . Reproductive behaviour, any activity directed toward perpetuation of a species The enormous range of animal reproductive modes is matched by the variety of reproductive behaviour Reproductive behaviour in animals includes all the events and actions that are directly involved in the process by