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and the specific name insignis means "unusual", in Latin. The holotype skeleton is notable for a number of long, superficially feather-like structures growing from its back, now thought to represent a single row growing upwards from the midline. The affinities of Longisquama among reptiles have long been contentious, with some researchers controversially connecting Longisquama and its back structures to the origin of birds and feathers, a view which is largely rejected. In 2025, a close relative,

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