1Ludwig-Maximilians-Universität München, Department für Biologie I, Systematische Botanik
und Mykologie, Geobio-Center, Menzinger Straße 67, 80638 Munich, Germany
2Department of Botany, Charles University, Benátská 2, 128 01 Prague 2, Czech Republic
3Mittlere Letten 11, 88634 Herdwangen-Schönach, Germany
4Department für Geo- und Umweltwissenschaften, Paläontologie und Geobiologie, Ludwig-Maximilians-Universität,
and SNSB-Bayerische Staatssammlung für Paläontologie und Geologie, Richard-Wagner-Straße 10, 80333 Munich, Germany
5Amber Study Group, c/o Geological-Palaeontological Museum of the University of Hamburg, Bundesstraße 55, 20146 Hamburg, Germany
6Georg-August-Universität Göttingen, Abteilung Geobiologie, Goldschmidtstraße 3, 37077 Göttingen, Germany
Received: 02 Mar 2017 – Accepted: 20 Mar 2017 – Published: 12 Apr 2017
Abstract. A revision of the Baltic and Bitterfeld amber fossils assigned to Cylindrocolea dimorpha (Cephaloziellaceae) has yielded evidence of the presence of multicellular, bifid underleaves, which have not previously been reported for this species and conflict with the current circumscription of the family. We transfer the fossil species to Odontoschisma (sect. Iwatsukia) and propose the new combination O. dimorpha of the Cephaloziaceae. Characteristics of the fossil include an overall small size of the plant, entire-margined, bifid leaves and underleaves, more or less equally thickened leaf cell walls, ventral branching that includes stoloniform branches with reduced leaves, and the lack of a stem hyalodermis and gemmae. Placement of the fossil in Cephaloziaceae profoundly affects divergence time estimates for liverworts based on DNA sequence variation with integrated information from the fossil record. Our reclassification concurs with hypotheses on the divergence times of Cephaloziaceae derived from DNA sequence data that provide evidence of a late Early Cretaceous to early Eocene age of the Odontoschisma crown group and an origin of O. sect. Iwatsukia in the Late Cretaceous to Oligocene.
Feldberg, K., Váňa, J., Schäfer-Verwimp, A., Krings, M., Gröhn, C., Schmidt, A. R., and Heinrichs, J.: Problems related to the taxonomic placement of incompletely preserved amber fossils: transfer of the Paleogene liverwort Cylindrocolea dimorpha (Cephaloziellaceae) to the extant Odontoschisma sect. Iwatsukia (Cephaloziaceae), Foss. Rec., 20, 147-157, doi:10.5194/fr-20-147-2017, 2017.