An early cladoxylopsid with complex vascular architecture: <i>Paracladoxylon kespekianum</i> gen. et sp. nov. from the Lower Devonian (Emsian) of Quebec, Canada

Paracladoxylon kespekianum is one of the largest Early Devonian euphyllophytes, among the oldest representatives of the cladoxylopsid group, and older than any species of the closely related Cladoxylon by at least 35 million years. It is also one of the oldest anatomically preserved representatives of the cladoxylopsid group. Its anatomical organization pushes the rise of complex vascular architecture among moniliformopsid euphyllophytes deeper in time than previously recognized.