TY  - JOUR
A1  - Feldberg, Kathrin
A1  - Váňa, Jiří
A1  - Schäfer-Verwimp, Alfons
A1  - Krings, Michael
A1  - Gröhn, Carsten
A1  - Schmidt, Alexander R.
A1  - Heinrichs, Jochen
T1  - 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)
Y1  - 2017
VL  - 20
IS  - 2
SP  - 147
EP  - 157
JF  - Fossil Record
DO  - 10.5194/fr-20-147-2017
DO  - 10.5194/fr-20-147-2017-supplement
DO  - 10.23689/fidgeo-2371
N2  - 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.
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/6684
ER  -