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This single fossil specimen from the Burgess Shale formation has been astonishingly well preserved, despite being very tiny. The head part is divided into two sections; both these projections were used for sense perception. The trunk consisted of some 19 segments, and there were three projections on it resembling tentacles. Each of the extensions on Insolicorypha’s body was equipped with 30 to 40 fine hairs. The presence of fan-like hairy extensions on its body shows that the animal must have been an active swimmer. This also explains its rarity, because since active swimmers do not generally live on the sea floor, they may not leave many traces behind. Since it cannot be linked to any present form of life, this creature comprises a family of its own—the Insolicoryphidae.80