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2 results for “Ptychagnostus atavus”
Data from: Cambrian series 3 agnostoid trilobites Ptychagnostus sinicus and Ptychagnostus atavus from the Machari Formation, Yeongwol Group, Taebaeksan Basin, Korea
This paper reports the successive occurrence of Ptychagnostus sinicus Lu, 1957 and Ptychagnostus atavus (Tullberg, 1880) from the lower part of the Machari Formation, Yeongwol Group, Korea. Morphometric approaches of using the landmark and principal component analyses make it possible to differentiate P. sinicus from P. atavus with clarity: pygidia of P. sinicus have a relatively narrow M1, a transverse F2, and a weakly developed M2 tubercle, whereas those of P. atavus are characterized by a broadly arching M1, a chevron-shaped F2, and a prominent M2 tubercle. Recognition of P. atavus, for the first time in Korea, allows the determination of the base of the Drumian Stage in Korea and aids correlation with other parts of the world.
Data from: Cambrian series 3 agnostoid trilobites Ptychagnostus sinicus and Ptychagnostus atavus from the Machari Formation, Yeongwol Group, Taebaeksan Basin, Korea
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