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ostracoderm
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Definitions of ostracoderm in various dictionaries:
noun - extinct fish-like jawless vertebrate having a heavily armored body
OSTRACODERM - Ostracoderms ("shell-skinned") are the armored jawless fishes of the Paleozoic. The term does not often appear in classifications today because it is...
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Any of several groups of extinct primitive jawless fishes of the Ordovician through the Devonian periods in North America and Europe, having bodies that were encased in an armor of bony plates. |
extinct fishlike jawless vertebrate having a heavily armored body of the Paleozoic |
Ostracoderm might refer to |
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Ostracoderms ("shell-skinned") are the armored jawless fishes of the Paleozoic. The term does not often appear in classifications today because it is paraphyletic or polyphyletic, and has no phylogenetic meaning. However, the term is still used as an informal way of loosely grouping together the armored jawless fishes. * An innovation of ostracoderms was the use of gills not for feeding, but exclusively for respiration. Earlier chordates with gills used them for both respiration and feeding. Ostracoderms had separate pharyngeal gill pouches along the side of the head, which were permanently open with no protective operculum. Unlike invertebrates that use ciliated motion to move food, ostracoderms used their muscular pharynx to create a suction that pulled small and slow moving prey into their mouths. * The first fossil fishes that were discovered were ostracoderms. The Swiss anatomist Louis Agassiz received some fossils of bony armored fish from Scotland in the 1830s. He had a hard time cl |