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General Characters, Differences between Hagfishes and Lampreys (Agnatha)
SUBJECT : Zoology
AUTHOR : Vimala C M
PUBLISHED ON : 08/04/14
NUMBER OF PAGES : ( 5 Pages)
PRICE : Rs 3.75

The sub phylum Agnatha comprise of fish like forms that lack jaws. They are the oldest vertebrates. The fossil records show that they existed in the Paleozoic era. The class Ostracodermi consisted of forms that flourished from the Ordovician to the Devonian period of the Paleozoic era. They became extinct 300 million years ago.


 
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