Megagraulos semicircularis (Kobayashi, 1961)
�� (Order Name)	Ptychopariida Swinnerton, 1915
�� (Family Name)	Agraulidae Raymond, 1913
�� (Scientific Name)	Megagraulos semicircularis Kobayashi, 1961
�� (Morphology)	�� Ÿ��̸� �κδ� �ݿ��̴�. �̰�� ũ��ϵ��(cranidium) �� 1/2��̸� �� 鼭 �ټ� �� ̴�. 3�� ̰��ָ�� ĵκΰ��ָ�� ߴ��ϸ�, ��̰� ��̴� ũ��ϵ�� 1/3�̴�. �κο�� ھ��ְ� ��̰�� ̰� �� . ��ξȼ�� ϰų� �� 鼭 ��ϰ� ��. �� ѷ��ϰ� �� ª�� ħ�� ´�. 13�� ü�� ְ� �࿱�� ణ ��. �̺�(pygidium)�� 2��̰� 2��3�� ȯ�� ū �� ȯ, �ſ� �� 3�� ָ� �׸�� ̺ο�� ִ�.
ũ �� (Size)	�κ�(cephalon)�� 3~15mm, �̺�� 3~5mm
�� (Locality)	�� ϸ� ��⸮ (��а�, �� )
�� (Formation)	�� (Sambangsan Formation)
�� (Age)	�߱� į�긮�Ʊ� (Middle Cambrian)
Ư ¡ (Remarks)	�� Megagraulos semicircularis�� Ͽ�� ȴ�. �κ�(cephalon)�� ´� ��߱� Hsuchuang�� Porilorenzella vicina�� , ��ڴ� �� ھƿ�� κο�� Ǯ�� ̰��, �׸�� ĵκΰ�� ִ�.
�� (Reference)	Choi, D. K., Lee, J. G., and Choi, S. Y., 1999. Middle Cambrian trilobites from the Sambangsan Formation in Yongwol Area, Korea. Journal of Paleontological Society of Korea, 15(2): 134-144. Kim, I. S., Cheong, C. H. and Lee, H. Y., 1985. Trilobites from the Sambangsan Formation in the eastern side of the Pyeongchang area, Kangweon-Do, South Korea. Journal of the Geological Society of Korea, 21: 45-49. Kobayashi, T., 1961: The Cambro-Ordovician formations and faunas of South Korea, Part VIII, Palaeontology VII, Cambrian faunas of the Mungyeong (Bunkei) District and the Samposan Formation of the Yeongweol (Neietsu) District. Journal of the Faculty Science, University of Tokyo, Section II, 13: 181-241. Rasetti, F., 1951. Middle Cambrian stratigraphy and faunas of the Canadian Rocky Mountains. Smithonian Miscellaneous Collections, 116, 270p. Walcott, C. D., 1906. Cambrian faunas of China. Proceedings of U. S. National Museum, 30: 563-595.
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