give information about notochord and state the characteristic of animal of protochordata
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They have a small rod like structure on the dorsal side of their body which is called notochord.
They have the dorsal tubular nervous system whch is not very well- developed and is of primitive type.
They have the primitive type of gill slits
Protochordate animals may have the notochord in the different places
like in tail region or in head region and in one half region of the
body.
Depending on the position of the notochord the group protochordata is again divided into following subphylum:
(1) Subphylum - hemichordata in which the notochord is present in the
anterior one half of the body. The representative animal os this
subphylum is called Balanoglossus.
(2) subphylum - urochordata in which the notochord is present in the
tail region. The representative animal of this subphylum is called herdmania.
(3) Subphylum - cephalochordata. The representative animal of this phylum is called Amphioxus.
(4) It is very important to know that all these three subphyla of the group
protochordata although exhibit the primitive characters of phylum
chordata can not be included under vertebrata because they do not have
fdwell developed vertebral column. But they have the initial form of
vertebral column which is just the notochord or the rod like structure
found in the dorsal side of the body.
PLEASE MARK ME THE BRAINLIEST PLEASE
They have the dorsal tubular nervous system whch is not very well- developed and is of primitive type.
They have the primitive type of gill slits
Protochordate animals may have the notochord in the different places
like in tail region or in head region and in one half region of the
body.
Depending on the position of the notochord the group protochordata is again divided into following subphylum:
(1) Subphylum - hemichordata in which the notochord is present in the
anterior one half of the body. The representative animal os this
subphylum is called Balanoglossus.
(2) subphylum - urochordata in which the notochord is present in the
tail region. The representative animal of this subphylum is called herdmania.
(3) Subphylum - cephalochordata. The representative animal of this phylum is called Amphioxus.
(4) It is very important to know that all these three subphyla of the group
protochordata although exhibit the primitive characters of phylum
chordata can not be included under vertebrata because they do not have
fdwell developed vertebral column. But they have the initial form of
vertebral column which is just the notochord or the rod like structure
found in the dorsal side of the body.
PLEASE MARK ME THE BRAINLIEST PLEASE
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