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中文名:(NMNS001699-F035765)

往肋刺延伸；有5對葉狀肋刺及一個尾刺。本件化石胸部前端略為拱起，全長6.8公分，寬4公分。館號(編目號):NMNS001699-F035765 .....more

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, with 6 to 8 axial rings; pleural fields usually wider than axis, with 6 to 8 pleurae merging into narrow.....more

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end, with 3 or 4 axial rings and terminal; 5 or 6 pleurae ending in spines of variable length along.....more

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半環（articulating half-rings）及溝（furrows）顯著，但無關節半肋（articulating half-ribs）或鉸合面（facets）；肋區有6-8對放射狀肋條及一個兩.....more

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