Class Ostracodermi: Class Ostracodermi include the primitive Vertebrate fossil found and they help to study the ancestral Vertebrate. They are fish-like jawless Vertebrate known as Ostracoderms. The present-day Cyclostomata also evolved from the Ostracoderm and there are many similarities between them so they are placed under a common group Agnatha. Before Ostracoderms, there are no … Read more
Biological Significance of Class Ostracodermi: Ostracodermi was the most primitive fossil evidence of Vertebrata, before Ostracodermi there was also several Vertebrate on our earth but we have no fossil. Only Ostracoderms fossil give us the idea about the primitive Vertebrate, Ostracoderms help us to understand how invertebrates evolved into Vertebrate. We find the Ostracoderm fossil … Read more
Ostracoderms are today extinct so we can not study all features in a living state but on the basis of available fossils, we can divide class Ostracodermi into 2 subclasses. Subclass 1: Monorhina: The important feature of this subclass is the presence of a large-sized, slit-like median eye present on the head between the two … Read more
Ostracoderms are the primitive members of the subphylum Vertebrata but they were not the first Vertebrate to originate on our earth. Before them, there were the ancestors of Subphylum Vertebrata but their fossil evidence is not available today, there are different opinions about the absence of fossil evidence for the ancestors of Subphylum Vertebrata. Ostracoderms … Read more