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Oryctocephalus : ウィキペディア英語版 | Oryctocephalus
''Oryctocephalus'' is a genus of trilobite known from the Middle Cambrian Burgess Shale. This small- to medium-sized trilobite's major characteristics are prominent eye ridges, pleural spines, long genal spines, spines on the pygidium, and notably four furrows connecting pairs of pits on its glabella.〔Coppold, Murray and Wayne Powell (2006). ''A Geoscience Guide to the Burgess Shale'', p.56. The Burgess Shale Geoscience Foundation, Field, British Columbia. ISBN 0-9780132-0-4.〕 Juvenile specimens have been found with only 5 or 6 thoracic segments and about one eighth of adult size, as well as about 2 mm wide.〔Coppold, Murray and Wayne Powell (2006). ''A Geoscience Guide to the Burgess Shale'', p.60. The Burgess Shale Geoscience Foundation, Field, British Columbia. ISBN 0-9780132-0-4.〕 == References ==
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