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of pits, or effaced. Pygidium with 2 to 4 pairs of pleural ribs and spines; axial rings few. Surface.....more
, with 6 to 8 axial rings; pleural fields usually wider than axis, with 6 to 8 pleurae merging into narrow.....more
end, with 3 or 4 axial rings and terminal; 5 or 6 pleurae ending in spines of variable length along.....more
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
壁為一或多圈隔片聯桿環（synapticular rings）所形成的多孔體壁；隔片由3乃至8個幾近垂直的羽榍（trabeculae）鬆散連結而成，多孔狀；部分隔片最內端的羽榍可衍生發展成為籬柱.....more
