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Platimeliphyllum valentinii
Platimeliphyllum valentinii Kodrul, N.P. Maslova Paleontol. J., 41(11): 1111. Nov 2007
- Name
- Platimeliphyllum valentinii
- Rank
- Species
- Generic Name
- [Genus] Platimeliphyllum
- Authors (Pub.)
- Kodrul T. M.
Maslova N. P.
- Publication
- A new species of the genus Platimeliphyllum N. Maslova from the Paleocene of the Amur Region, Russia [2007/11]
- Journal
- Paleontological Journal
- Volume
- 41
- Issue
- 11
- Page number
- 1111
- Year
- 2007
- Fossil Status
- leaves
- Stratigraphy
- Paleocene
- Strat. comment
- Tsagayan Formation
- Location
- Arkhara-Boguchan coal field, 15 km
northeast of the village of Arkhara, Amur region, Russian Federation
- Paleoregion
- Eurasia (Far East)
Data for Holotypus
- Repository
- Geological Institute, Russian Academy of Sciences, Moscow, Russian Federation
- Repository Number
- GIN, no. AB3-115
- Diagnosis
- Leaf blade entire, rounded, roundedovate,
or oval, variously asymmetric. Length/width
ratio 1.1–1.7. Leaf base cordate and rounded, or wedgeshaped,
often asymmetric and peltate. Leaf blade apex
acuminate, occasionally elongated mucronate. Leaf
margin toothed, teeth from small concave-concave to
larger convex-concave or rounded, often with pointed
apex. Venation actinodromous, basal veins usually
deviate suprabasally, reach at least half of leaf blade
length, give five to eight basiscopic deviations, looping
or ending craspedodromously. Secondary veins weakly
arching, five to eight pairs, three lower pairs give up to
three basiscopic deviations. Tertiary veins thin, weakly
arching or sinuous, opposite percurrent, and alternate
percurrent. Finer venation includes system of polygonal
meshes with dichotomizing vein. Epidermis of
upper leaf surface consists of polygonal cells with
undulating anticlinal walls. Epidermal cells of lower
leaf surface predominantly tetragonal, with equal sides,
usually in rows radiating from stomata. Stomata anomocytic,
with five to seven subsidiary cells.
