Cetaceans

On what basis are cetaceans grouped?

On what basis are cetaceans grouped?

Cetaceans are divided into two parvorders. The larger parvorder, Mysticeti (baleen whales), is characterized by the presence of baleen, a sieve-like structure in the upper jaw made of keratin, which it uses to filter plankton, among others, from the water.
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Phylogeny.

Mysticeti(right, grey, rorquals)
baleen whales

  1. How are cetaceans grouped?
  2. What are the two main groups of cetaceans?
  3. What are the three main groups of cetaceans?
  4. What do mammals and cetaceans have in common?
  5. What type of taxonomic groups are Mysticeti and Odontoceti?
  6. What animals are classified as cetaceans?
  7. Which of these cetaceans is classified as a toothed whale?
  8. What are the two groups cetaceans are split into and what makes them different?
  9. Why are cetaceans mammals?
  10. What makes a cetacean a cetacean?
  11. How many cetaceans are in the world?
  12. What types of ecosystems do cetaceans live in?

How are cetaceans grouped?

cetacean, (order Cetacea), any member of an entirely aquatic group of mammals commonly known as whales, dolphins, and porpoises. ... Because of their body form, however, cetaceans were commonly grouped with the fishes.

What are the two main groups of cetaceans?

Cetaceans are separated into two groups: toothed and baleen whales. As their name suggests, toothed whales (or odontocetes) have teeth. They also have one opening at their blowhole.

What are the three main groups of cetaceans?

Why are Cetaceans Important? Is it a Fish or Cetacean? Cetaceans are divided into three main groups or sub-orders, one of which is extinct: the archaeoceti (the archaeocetes or ancient whales, which are extinct), mysticeti (the mysticetes or baleen whales) and odontoceti (the odontocetes or toothed whales).

What do mammals and cetaceans have in common?

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 type of taxonomic groups are Mysticeti and Odontoceti?

The Mysticeti and Odontoceti are classified to as superfamilies or suborder, depending on what classification system you view.

What animals are classified as cetaceans?

Cetaceans (order Cetacea) are an entirely aquatic order of mammals comprising the whales, the dolphins, and the porpoises. The ancient Greeks recognized that cetaceans breathe air, give birth to live young, produce milk, and have hair—all features of mammals.

Which of these cetaceans is classified as a toothed whale?

Odontoceti, the toothed whales, consist of around 70 species, including the dolphin, porpoise, beluga whale, narwhal, sperm whale, and beaked whale.

What are the two groups cetaceans are split into and what makes them different?

There are two types of whale; baleen and toothed. The key difference between them is the way they feed and what they have inside their mouth.

Why are cetaceans mammals?

Whales are mammals because they give birth to live young, they have fur (although it is very sparse on their body), they have lungs and breath air and they provide milk for their young. Answer 3: ... Dolphins and other whales are all mammals called cetaceans.

What makes a cetacean a cetacean?

A cetacean is a member of the family of large aquatic mammals such as whales, dolphins, and porpoises. They have tails rather than hind limbs, and they have flippers instead of forearms. ... any of several whales having simple conical teeth and feeding on fish etc.

How many cetaceans are in the world?

The Cetacea (whales, dolphins and porpoises) currently include 86 species that inhabit the world's oceans, lakes and rivers.

What types of ecosystems do cetaceans live in?

Whales and dolphins live and feed in almost every part of the marine environ- ment including the great rivers and their estuaries (Platanistidae), continen- tal shelves (Mysticeti, Phocoenidae), deep ocean canyons (Physetertdae, Ziphiidae), tropical oceans (Delphinidae), and even amidst ice in the Arctic (Monodontidae, ...

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