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Condylopygidae : ウィキペディア英語版
Condylopygidae

The Condylopygidae are a family of very small trilobites, that lived during the Middle Cambrian, and has been found in Canada (Newfoundland and Nova Scotia), the Czech Republic, Germany, France, Spain, England, Wales, Sweden, and the Russian Federation (Siberia). They uniquely differ from all other Agnostina in having the frontal lobe of the central raised area of the headshield (or glabella) wider than the rear lobe. The Condylopygidae are the only family assigned to the Condylopygoidea superfamily.

== Taxonomy ==
The Condylopygoidea are a small and isolated branche in the Agnostina suborder. It occurs approximately at the same moment in time as the Peronopsidae, the earliest representatives of the main branche of the Agnostina. One species, ''Peronopsis palmadon'', is intermediate between Peronopsidae and Condylopygidae, but it is not clear whether ''P. palmadon'' is ancestral to the Condylopigidae, a regression towards ancestral characters or an example of parallel evolution.

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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