An innovation of ostracoderms was the use of gills not for feeding, but exclusively for ciliated motion to move food, ostracoderms used their muscular pharynx to create a suction that pulled small and slow moving prey into their mouths.
32.
An innovation of ostracoderms was the use of gills not for feeding, but exclusively for ciliated motion to move food, ostracoderms used their muscular pharynx to create a suction that pulled small and slow moving prey into their mouths.
33.
He compared them at first with extant armored fish such as catfish and sturgeons but later realizing that they had no movable jaws, classified them in 1844 into a new group " ostracoderms " which means " shell-skinned ".
34.
After the appearance of jawed fish ( placoderms, acanthodians, sharks, etc . ) about 420 million years ago, most ostracoderm species underwent a decline, and the last ostracoderms became extinct at the end of the Devonian period.
35.
After the appearance of jawed fish ( placoderms, acanthodians, sharks, etc . ) about 420 million years ago, most ostracoderm species underwent a decline, and the last ostracoderms became extinct at the end of the Devonian period.
36.
Earlier chordates used their gills for both respiration and feeding, whereas ostracoderms used their gills for ciliated motion to move food, ostracoderms used their muscular pharynx to create a suction that pulled small and slow moving prey into their mouths.
37.
Earlier chordates used their gills for both respiration and feeding, whereas ostracoderms used their gills for ciliated motion to move food, ostracoderms used their muscular pharynx to create a suction that pulled small and slow moving prey into their mouths.
38.
The first armored agnathans the Ostracoderms, precursors to the bony fish and hence to the tetrapods ( including humans ) are known from the middle Ordovician, and by the Late Silurian the agnathans had reached the high point of their evolution.
39.
The first armoured agnathans the Ostracoderms, precursors to the bony fish and hence to the tetrapods ( including humans ) are known from the middle Ordovician, and by the Late Silurian the agnathans had reached the high point of their evolution.
40.
Later examinations these tubercles have led to the formation of two camps of experts, one of which that believe the three recognized species of " Ohioaspis " were rhenanids, while the other suggests that they were actually some sort of ostracoderm agnathans.
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