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eodiscina
Eodiscina is a suborder of trilobites, a well known group of marine arthropods. The Eodiscina first developed near the end of the Lower Cambrian period (late Atdabanian) and went extinct at the end of the Middle Cambrian. They are small or very small, and have a thorax of two or three segments.〔 Eodiscina includes six families classified under one superfamily, Eodiscoidea.
== Taxonomy ==
The Eodiscina are mostly considered the more primitive suborder of the Agnostida, and the Agnostina the more advanced. Some scholars do not consider the Agnostina true trilobites, and consequently rejected the idea that they were related to the Eodiscina.〔 Consequently, these scientists have proposed to elevate the group to ordinal level, which would thus be called Eodiscida Kobayashi, 1939.
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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