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Lepidaspis : ウィキペディア英語版
Lepidaspis

''Lepidaspis serrata'' ("Serrated Scaley Shield") is an extinct heterostracan jawless fish from Early Devonian Canada. Its scientific name refers to the fact that the armor is composed of hundreds of tiny scales with serrated edges.
Although it is regarded as a heterostracan, its exact placement within Heterostraci is regarded as ''incertae sedis'', as the fact that it is currently impossible to discern where its dorsal and ventral plates (which are made up of a mosaic of the aforementioned tiny scales) end or begin. Some experts regard it as being descended from the basal heterostracans of the Silurian.
==External links==

* (Pteraspidomorphi ) at Mikko's Phylogeny Archive


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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