What are the three subphyla of the chordates? Give an example of each.

Name: Problem 2, Chapter 48: Biology
Uploaded: 2022-02-22T09:52:04-08:00
Duration: 7 min 35 s
Channel: Nilma Khan
Description: What are the three subphyla of the chordates? Give an example of each.

What are the three subphyla of the chordates? Give an...

Key Concepts

Chordates

Chordates are animals that, during some stage of their development, possess a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. These features are the hallmark of the phylum Chordata and underpin the diversity seen in this group.

Cephalochordata

Cephalochordates are a subphylum of chordates characterized by a retained notochord throughout life and a simplistic body plan. They are primarily small, fish-like marine organisms, making them important for studying the basic chordate body structure and evolutionary origins.

Urochordata

Urochordates, also known as tunicates, form a subphylum where the larval stage exhibits key chordate features such as the notochord and nerve cord. As adults, many undergo significant morphological changes, often becoming sessile and losing some of these defining features, which highlights the diversity and adaptability within chordates.

Vertebrata

Vertebrates constitute the largest subphylum of chordates, characterized by the development of a vertebral column that replaces the notochord during development. This group includes a vast array of animals, from fishes and amphibians to birds and mammals, featuring more complex organ systems and structures.

Transcript

00:03 Hello students, our question is what are the three subfilars of the chordates? give an example of each.

00:15 As we all know that phylum chordata belongs to kingdom anemia and it is classified into three subfilars.

00:24 Eurocordator, svalo -cordator and vertebrator.

00:32 These are the sub -fylars of cordates.

00:37 The subfilum urochordata and spheroata are collectively known as proto -proto -cordates, which are marine animals.

00:56 They are invertebrates but they share attributes of chordates.

01:02 Now we will discuss about the subfilas of cordiates one by one.

01:09 The first subphyla of chordate is uro -cordata.

01:12 The adults are fixed to the substratum.

01:19 Adults are fixed to substratum.

01:36 It is also known as tunicates because the body of an adult is enclosed within a tunic made of cellulose -like substance, known as tunicins.

01:51 In eurocordates, notocode can be seen only in the larval state.

01:56 And disappears in adults.

02:01 The nerve cord present in larva is replaced by a dorsal ganglion in adults.

02:08 The larvae can move and undergoes a metamorphosis.

02:15 Examples of eurocordiards are c -squets and tunicates.

02:24 C -secrets and tunicates.

02:32 The next top -fileged, the next of chordata is spheylodeata.

02:42 The atrium is present in svelo cordata.

02:47 These are motile adults and larval stage.

02:51 The tail is present throughout life in svalo codetas.

02:57 They show progressive metamorphosis and the notocode is formed throughout the life.

03:05 Nottochot is found throughout the life, numerous well -developed pharyngeal slits are also present...

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