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共找到 5 筆符合的資料
. Glabella tapering with 1 to 4 pairs of usually deep slitlike lateral furrows, not reaching axial.....more
of pits, or effaced. Pygidium with 2 to 4 pairs of pleural ribs and spines; axial rings few. Surface.....more
structures. Generally speaking, the upper and lower jaws of these whales have 7 to 9 pairs of teeth.....more
tapering, with 2 or 3 pairs of lateral furrows; palpebral rim and furrow present, eye ridges present.....more
pairs of teeth. In 1997, construction workers unearthed some fossil specimens in the mountain regi.....more
