Mamontov Y.S.1,2,3, Heinrichs J.4, Váňa J.5, Ignatov M.S.1, Perkovsky E.E.6 2015. Hepatics from Rovno amber (Ukraine), 5. Cephaloziella nadezhdae sp. nov. // Arctoa. Vol. 24(2): 289–293 [in English].
1 Tsitsin Main Botanical Garden, Russian Academy of Sciences, Botanicheskaya 4, Moscow 127276 Russia, e-mails: firstname.lastname@example.org; email@example.com
2 Polar-alpine Botanical Garden-Institute of Kola SC RAS, 184236 Kirovsk-6, Russia
3 Komarov Botanical Institute, Russian Academy of Sciences, 2 Prof. Popov Str., St. Petersburg, 197376 Russia
4 Systematic Botany and Mycology, Geobio-Center, Ludwig Maximilians University of Munich, Menzinger Str. 67, 80638 Munich, Germany; e-mail: firstname.lastname@example.org
5 Department of Botany, Charles University, Benátská 2, CZ-12801 Praha 2, Czech Republic; e-mail: email@example.com
6 Schmalhausen Institute of Zoology of the Ukrainian National Academy of Sciences, B. Khmelnitsky str., 15, Kiev 01-106, Ukraine; e-mail: firstname.lastname@example.org
KEYWORDS: fossil, Cephaloziella, liverwort, Marchantiophyta, Ukraine, Rovno, Cenozoic, Late Eocene, amber
ABSTRACT. Light microcscopy and laser scanning confocal microscopy were used to investigate a sterile inclusion of a leafy liverwort in a piece of Late Eocene Rovno amber. The fossil is described as Cephaloziella nadezhdae sp. nov. The tiny liverwort resembles extant species of C. subg. Schizophyllum but differs by its small leaf cells. Leaf cells with a diameter of ca. 5–8 µm are known from the extant East Asian species C. microphylla; however, this species differs from the fossil in leaf shape and insertion, as well as the presence of acute conical mamillae. Cephaloziella nadezhdae is the first fossil representative of this subcosmopolitan genus.