Table of Contents
What organisms are in the order Cetacea?
This group, which includes all the animals commonly known as whales, dolphins and porpoises, has two main branches, the suborder Mysticeti of baleen whales, and the suborder Odontoceti of toothed whales.
What are distinguishing characteristics of Cetacea marine mammals?
‘huge fish’, sea monster) is an infraorder of aquatic mammals that includes whales, dolphins, and porpoises. Key characteristics are their fully aquatic lifestyle, streamlined body shape, often large size and exclusively carnivorous diet.
What do all animals in the order Cetacea have in common?
Cetacean Characteristics Cetaceans are mammals, which means they are endothermic (commonly called warm-blooded) and their internal body temperature is about the same as a human’s. They give birth to live young and breathe air through lungs just like we do. They even have hair.
Are dolphins cetacean?
Scientifically, all whales, dolphins and porpoises are classified as Cetacea. And within Cetacea are two suborders: baleen whales and toothed whales.
Which of the following characteristics about sirenians are true?
Marine mammals must surface to breathe air. Which of the following characteristics about sirenians are true? They live in shallow water and move slowly, which can often increase their risk of being run over by boats. They have a paddle-like tail and rounded front flippers.
What are 2 characteristics that distinguish baleen whales?
Size. Baleen whales are some of the world’s largest animals.
What is a characteristic of a baleen whale?
The general body shape of baleen whales is roughly cylindrical but tapering at both ends. This characteristic fusiform shape is quite energy efficient for swimming. Compared to other body shapes, this body shape creates less drag (the opposing force an object generates as it travels through water).
What are the characteristics of Sirenia?
Sirenians have the following morphological characteristics in common: robust body; tough, thick skin with little hair; two nostrils on top or at the front of a thick muzzle; no ear pinnae; no hind limbs; mammary nipples located near the axillae; forelimbs modified into flippers; horizontally flattened tail; and dense.
What is the order Cetacea?
The Order Cetacea is the group of marine mammals that includes the cetaceans – the whales, dolphins and porpoises . There are 86 species of cetaceans, and these are divided into two suborders – the mysticetes ( baleen whales, 14 species) and odontocetes ( toothed whales, 72 species).
What are the characteristics of cetaceans?
Cetaceans are mammals, which means they are endothermic (commonly called warm-blooded) and their internal body temperature is about the same as a human’s. They give birth to live young and breathe air through lungs just like we do. They even have hair .
What are cetaceans and how did they evolve?
Cetaceans are thought to have evolved from even-toed ungulates (a group that includes cows, camels, and deer). There are many types of cetaceans, which are divided largely according to how they feed. The order Cetacea is divided into two sub-orders, the Mysticetes (baleen whales) and the Odontocetes ( toothed whales ).
Do cetaceans have a 4 chambered heart?
Cetaceans, like all mammals, have a four-chambered heart with paired ventricles and auricles. The pattern of circulation is similar to that of other mammals, with the exception of a series of well-developed reservoirs for oxygenated blood called the rete mirabile, for “marvelous network.”