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calcar
The calcar, also known as the calcaneum,〔(The Anatomy of Bats )〕 is the name given to a spur of cartilage arising from inner side of ankle and running along part of outer interfemoral membrane in bats,〔〔The Handbook of British Mammals ()〕 This is to help spread the interfemoral membrane,〔(Encyclopedia Smithsonian: Bat Facts )〕 which is part of the wing membrane between the tail and the hind legs.
This membrane can form a basket or pouch to help catch and hold insects captured in flight.〔(The Anatomy of Bats )〕 The oldest known ancestor to present day bats, Icaronycteris index, apparently did not have a calcar or spur as evidenced by fossil remains.〔Ontogeny, Functional Ecology, and Evolution of Bats (ISBN 978-0-52-162632-3)〕
Calcar (Femorale) also refers to the dense, vertically oriented bone present in the posteroemedial region of the femoral shaft superior to the lesser trochanter of the femur.
==References==
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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