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The Class
Class (biology)

A class is the taxonomic rank in the biological classification of organisms in biology below phylum and above Order .The orders of taxonomy are life, Domain , kingdom , phylum, class , order , family , genus, and species....
 Osteostraci ("Bony Shields") was a group of bony-armored jawless fish, termed "ostracoderm
Ostracoderm

Ostracoderms are any of several groups of extinction, primitive, jawless fishes that were covered in an armor of Bone plates. They belong to the taxon Ostracodermi, and their fossils are found in the Ordovician and Devonian Period Stratigraphy of North America and Europe....
s", that lived in what is now North America, Europe and Russia from the Middle Silurian to Late Devonian.

Anatomically speaking, the osteostracans, especially the Devonian species, were among the most advanced of all known agnathans. This is due to the development of paired fins, and their complicated cranial anatomy.






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The Class
Class (biology)

A class is the taxonomic rank in the biological classification of organisms in biology below phylum and above Order .The orders of taxonomy are life, Domain , kingdom , phylum, class , order , family , genus, and species....
 Osteostraci ("Bony Shields") was a group of bony-armored jawless fish, termed "ostracoderm
Ostracoderm

Ostracoderms are any of several groups of extinction, primitive, jawless fishes that were covered in an armor of Bone plates. They belong to the taxon Ostracodermi, and their fossils are found in the Ordovician and Devonian Period Stratigraphy of North America and Europe....
s", that lived in what is now North America, Europe and Russia from the Middle Silurian to Late Devonian.

Anatomically speaking, the osteostracans, especially the Devonian species, were among the most advanced of all known agnathans. This is due to the development of paired fins, and their complicated cranial anatomy. However, the osteostracans were more related to other agnathans than to jawed vertebrates as their inner ears are formed by two pairs of semicircular canals, similar to those of living lamprey
Lamprey

A lamprey is a parasitic marine animal with a toothed, funnel-like sucking mouth. While lampreys are well known for those species which bore into the flesh of other fish to hematophagy, these species make up the minority....
s, as opposed to the three pairs found in the inner ears of jawed vertebrates.

External links

http://academic.emporia.edu/mooredwi/nathist/chap3.htm