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Mobergella
''Mobergella'' is a millimetric Lower Cambrian shelly fossil of unknown affinity, usually preserved in phosphate and particularly well known from Swedish strata, where it is diagnostic of lowermost Cambrian rocks.〔 Originally interpreted as a monoplacophoran,〔 the circular, cap-shaped shell resembles a hyolith operculum, with concentric rings on its upper surface, and seven pairs of internal muscle scars; however it is never found in association with a hyolith conch, and its affinity therefore remains undetermined. Some specimens bear evidence of healed injuries. == Occurrence == The genus is unique to Lower Cambrian strata and has been found throughout the northern hemisphere.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Mobergella」の詳細全文を読む
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