The only known species, P. corneti, was described in 1984 based on a single bone (MTCO-P 1637) interpreted as the distal part of a left femur, found in Early Cretaceous (Berriasian rocks (dating to around 143 mya) from a mine at Cornet near Oradea in northwestern Romania.
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However, that genus name had already been given to the Curve-billed Reedhaunter (L. curvirostris), an ovenbird.