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Iapetognathus fluctivagus : ウィキペディア英語版
Iapetognathus fluctivagus

''Iapetognathus fluctivagus'' is a species of denticulate cordylodan conodonts belonging to the genus ''Iapetognathus''. It existed during the Tremadocian Age ( million years ago) of the Ordovician. It is an important index fossil in biostratigraphy.
== Description ==
Like other members of the genus, ''Iapetognathus fluctivagus'' had ramiform (branching) array of elements (apparatus). It is believed that the ramiform apparatus in ''Iapetognathus fluctivagus'' evolved from the coniform (cone-like) apparatus of ''Iapetonudus ibexensis''. It can be readily distinguished from other conodonts existing during the same age by the sideward orientation of the major teeth-like projections (denticulate processes).

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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