Question

Define Phylogeny of protochordata?​

Answer 1

Answer:

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Answer 2

Answer:

Lower chordates are frequently referred to as protochordate. These animals are also known as Acraniata since they lack a head and a skull or cranium.

Concerning the notochord's property Protochordates are divided into three subphyla, as follows.

• Urochordata 
• Cephalochordata
• Hemicordarata

Explanation:

"Phylogeny is the study of the evolutionary development of groupings of organisms,"

Urochordata 

• The notochord is only present in the tail of the larva (hence the term urochordates), and it vanishes in the adult. Examples: Doliolum, Herdmania, Salpa
• They are filter–feeders that live in the sea and are generally sessile.

• The body is protected by a leathery test or tunic sheath made of tunicin (cellulose), which is known as tunicates.

Cephalochordata:

• These are likewise filter-feeders with a marine diet.
• The notochord can be found all the way up to the cephalic (head) region and lasts for the rest of one's life.
• The nerve chord lasts for the rest of one's life, but no brain develops.

Hemicordarata:

• Hemichordates are all marine creatures.
• The body is robust and unsegmented, with a wormlike or vaselike appearance.
• There are three separate regions: proboscis, collar, and trunk.