Type material of Trochodendroides richardsonii (Heer) Krysht. (Cercidiphyllaceae) from the Atanikerdluk (Paleocene, Greenland)

Abstract

Type material of Trochodendroides richardsonii (Heer) Krysht. from the Paleocene Atanikerdluk locality, Greenland, was restudied based on the original collection stored in the National Museum of Ireland, Dublin. This work allowed us to reveal the main diagnostic features of this species facilitating an emended diagnosis. Photos of the lectotype and syntypes are presented for the first time. The restudy of the collections stored in Dublin, Saint Petersburg and Stockholm shows that T. richardsonii was distributed in the early Paleocene in Greenland and Svalbard. The revision of T. richardsonii type material allows us to distinguish this species from the other species of the genus Trochodendroides Berry with similar morphology.