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Anastrophyllum rovnoi
Anastrophyllum rovnoi Mamontov, Heinrichs, Váňa in Mamontov, Heinrichs, Váňa, Ignatov, Perkovsky Arctoa, 24(1): 45. 22 Jan 2015
- Name
- Anastrophyllum rovnoi
- Rank
- Species
- Generic Name
- [Genus] Anastrophyllum
- 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), 3 [2015/1]
- Journal
- Arctoa
- Volume
- 24
- Issue
- 1
- Page number
- 45
- 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-915-F
- Diagnosis
- Sterile, 2.2 mm long and up to 0.8 mm wide shoot. Stem 110–125 m wide, cortical cells rectangular, 9–1318–22(-29) m, walls moderately thickened. Rhizoids on lower portion of ventral stem surface, as long as leaves, colorless, scarce, spreading at right angle to stem; leaves remotely arranged, bilaterally inserted and oriented, thus distichous, alternating, succubous, in ventral half with obliquely arcuate insertion line, not decurrent ventrally. Lower two pairs of leaves larger than upper ones, 250–330425–60 m, obliquely inserted, plane or somewhat concave, perpendicularly spreading, elliptical, entire-margined, bilobed to 0.4 of leaf length, sinus obtuse to rounded, lobes sub-equal, triangular, 9–11 cells wide at base, apex obtuse to somewhat rounded. Subsequent two pairs of leaves transversely inserted, concave-conduplicate, lamina spreading from stem at right angle, but bases spreading at an angle of 40–45°. Upper three pairs of leaves decreasing in length towards shoot apex, 270 m to 110 m, thus substantially smaller than lowermost leaves, transversely inserted, somewhat concave to almost flat, erect spreading, with angle of leaf-stem divergence decreasing from 70° to 20° towards shoot apex, uppermost leaves therefore appressed to stem. Leaf cells arranged in irregular rows parallel to leaf margins, conspicuously elongated in basal and lower median portions of lamina, with distinctly incrassate walls and nodulose trigones. Cells of lobe apex and margins elongate to rounded-quadrate, 121515–22 m, central leaf cells larger, rounded-elongate, 12–1822–26 m. Cuticle smooth. Underleaves absent. Gemmae absent.