Cephaloziella nadezhdae

Name

Cephaloziella nadezhdae

Rank

Species

Generic Name

[Genus] Cephaloziella

Authors (Name)

Mamontov Yu. S. Heinrichs J. Váňa J.  

Authors (Pub.)

Mamontov Yu. S. Heinrichs J. Váňa J. Ignatov M. S. Perkovsky E. E.  

Publication

Hepatics from Rovno amber (Ukraine), 5 [2015/9]

Journal

Arctoa

Volume

24

Issue

2

Page number

293

Year

2015

Fossil Status

thallus

Stratigraphy

Priabonian

Strat. comment

35–37 Ma; in amber

Location

Klesov (Pugach quarry), Vladimirets District, Rovno Region, Ukraine

Paleoregion

Eurasia (Europe)

Data for Holotypus

Repository

Schmalhausen Institute of Zoology (SIZK)., National Academy of Sciences of Ukraine, Kyiv, Ukraine

Repository Number

SIZK-K-24755-F

Num

1-18

Pub.

Hepatics from Rovno amber (Ukraine), 5 [2015/9]

Diagnosis

Sterile shoot fragment 1.2 mm long and up to 50 μm wide. Stem 15–25 μm in diameter; cortical cells short-rectangular, 8–116–8 μm. Leaves somewhat ovarlapping, transversely inserted, succubous by presence of dorsally oriented lobes, not or somewhat decurrent along stem, flat to concave, 23–404060 μm, erect to erect spreading, at places subimbricate, elliptical, almost entire-margined in lower third of shoot, in upper two thirds of shoot with irregular, obtuse marginal teeth. Abaxial leaf face sometimes with low knob-like projections and ridge-like multicellular outgrowths below the sinus. Leaves bilobed to 0.5–0.85 of its length, sinus acute or rounded; lobes almost equal in leaves from lower half of shoot but slightly to clearly unequal in leaves from upper shoot sectors, narrow to broadly triangular, apparently 2–3 cells wide at base, straight to contiguous, incurved to stem at places, apex acuminate to acute, ending in a one cells long uniseriate tip, apical cell triangular. Leaf cells hardly visible, apparently subisodiametric, near leaf apices obviously somewhat elongated, those at base of lobes 5–8 μm wide, walls thin to incrassate, without distinct nodulose trigones. Gemmae angulate, 9.77.7 μm; in clusters at shoot apex, subtended by an uppermost leaf.