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raphiophoridae
Raphiophoridae is a family of small to average size trilobites that first occurred at the start of the Ordovician and went extinct at the end of the Middle Silurian.
== Anatomy ==
All Raphiophorids are blind, with headshields (or cephalons) that are triangular to subcircular, many carrying long trailing genal spines, a forward directed rapier-like spine on the central raised area (or glabella) or both, with the glabella often inflated and the natural fracture lines (or sutures) of the cephalon coinciding with its margin. Thorax with 7 to 5 segments (except for ''Taklamakania'', ''Pseudampyxina'' and ''Nanshanaspis'' that have only 3).
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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