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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
