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・ Agonac
・ Agonal
・ Agonal heart rhythm
・ Agonal respiration
・ Agonalia
・ Agonandra
・ Agnostic Front
・ Agnostic Hymns & Stoner Fables
・ Agnostic theism
・ Agnosticism
・ Agnostida
・ Agnostidae
・ Agnostogonus
・ Agnostophana
・ Agnostotes orientalis
Agnostus
・ Agnosía
・ Agnotherium
・ Agnotocastor
・ Agnotocastor galushai
・ Agnotology
・ Agnotozoa
・ Agnovad
・ Agnus
・ Agnus Berenato
・ Agnus Dei (Barber)
・ Agnus Dei (disambiguation)
・ Agnus Dei (film)
・ Agnus Dei (liturgy)
・ Agnus Dei (music)


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Agnostus : ウィキペディア英語版
Agnostus

''Agnostus'' is a genus of agnostid trilobites that lived during the upper Middle Cambrian–lower Upper Cambrian (approximately 506 to 492 million years ago). It is the type genus of the family Agnostidae. It is subdivided into two subgenera, ''Agnostus'' and ''Homagnostus''.〔(【引用サイトリンク】title=''Agnostus'' )〕〔(Morphology, Ontogeny, and Life Habit of ''Agnostus pisiformis'' From the Upper Cambrian of Sweden - Number 19 )〕
== Etymology ==
''Agnostus'' is from the Ancient Greek άγνωστος (ágnostos) "unknown", and reflects the fact that early paleontologists did not know what type of animal they were confronted with.
The species epithets have the following origins:
* ''pisiformis'' derives from the Latin pīsum which means "pea", and forma meaning "shape", for its globe-like appearance when rolled.

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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