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共找到 4 筆符合的資料
；殼腹（殼體外緣）為平滑或有凹紋的圓弧。本科菊石化石，以餅菊石屬（Placenticeras；Placenta= flat cake 系統識別碼:0b00000180032b46 .....more
pairs of prominent flat spines. Surface smooth or finely granulose. Bertillon pattern strong.....more
convex; pleurae flat, ending in spines, 1.5 to 2 times width (tr.) of axis, with broad pleural furrow.....more
into the wide and flat shovel shaped tusk-incisors. Thus, a one-meter long scoop-like lower jaw.....more
