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Onychonycteris finneyi was the strongest evidence so far in the debate on whether bats developed echolocation before or after they evolved the ability to fly. O. finneyi had well-developed wings, and could clearly fly, but lacked the enlarged cochlea of all extant echolocating bats, closely resembling the old world fruit bats which do not echolocate. [1]
A picture illustrating the location of the calcar on a bat. The calcar, also known as the calcaneum, [1] 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, [1] [2] as well as to a similar spur on the legs of some arthropods.
Little brown bat take off and flight. The finger bones of bats are much more flexible than those of other mammals, owing to their flattened cross-section and to low levels of calcium near their tips. [53] [54] The elongation of bat digits, a key feature required for wing development, is due to the upregulation of bone morphogenetic proteins (Bmps).
Recently, there have been comparative studies of mouse and bat forelimb development to understand the genetic basis of morphological evolution. Consequently, the bat wing is a valuable evo-devo model for studying the evolution of vertebrate limb diversity. Diagram showing homologous skeletal structures of bat and mouse
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The connection between the stylohyal bone and the tympanic bone enables the bat to neurally register the outgoing and incoming ultrasonic waves produced by the larynx. [11] Furthermore, the stylohyal bones connect the larynx to the tympanic bones via a cartilaginous or fibrous connection (depending on the species of bat).