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Certain beetles are known to pollinate plants. New fossil evidence from Mexican and Dominican fossilized amber indicates that they were doing so 20 million years ago (Miocene epoch), according to Oregon State University scientist George Poinar, Jr.
This membrane can form a basket or pouch to help catch and hold insects captured in flight. The oldest known ancestor to present day bats, Icaronycteris index, apparently did not have a calcar or spur as evidenced by fossil remains. The oldest known bat with a calcar is Onychonycteris. Calcar (Femorale) also refers to the dense, vertically oriented bone present in the posteroemedial region of the femoral shaft inferior to the lesser trochanter of the femur. ^ The Anatomy of Bats.