what are the differences between protochordata and vertebrate.
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Answers
Explanation:
Like the remaining subphylum of the chordates, the Vertebrata, the protochordates have a hollow dorsal nerve cord, gill slits, and a stiff supporting rod, the notochord, the forerunner of the backbone. The protochordates differ chiefly from the vertebrates in not having a backbone.
Answer:
Protochordate and Vertebrate fall under the classification of 'Chordates'.
Chordates are known to have a notochord (either at a certain stage of life or throughout the lifespan).
Protochordates are the animals having a notochord at some stage or throughout the life. They have no vertebral column (i.e. an evolved notochord). They are further divided into two:
Urochordate
Cephalochordate
Urochodates have a notochord during their larval stage. However, they loose it during adulthood (due to metamorphosis). As they do not have a vetebral column and show the presence of notochord at a certain stage of life, they are included under protochordates.
Cephalochordates have a notochord throughout their lifespan. Therefore, known to be under protochordates.
Vertebrates are the animals possessing a well-developed notocord i.e. Vertebral Column. The question is why are they included under chordates if they don't have a notochord? The obvious answer can be that Vertebral Column is an evolved notochord by itself. But a more accurate answer would be that Vertebrates show the presence of notochord in their body during embryonic stage (as an embryo in mother's womb) which further develops into vertebral column.