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Trisquama valentinii
Trisquama valentinii Gordenko, Broushk. Paleontol. Zhurn., 2018, (1): 90. 2018
- Name
- Trisquama valentinii
- Rank
- Species
- Generic Name
- [Genus] Trisquama
- Authors (Pub.)
- Gordenko N. V.
Broushkin A. B.
- Publication
- Semennye organy Trisquamales ordo. nov. (Gymnospermae) iz sredney yury Kurskoy oblasti, Evropeyskaya chast' Rossii [2018]
- Journal
- Paleontologicheskii Zhurnal
- Annee/Jahrgang
- 2018
- Issue
- 1
- Page number
- 90
- Year
- 2018
- Fossil Status
- reproductive organs (seed)
- Stratigraphy
- Bathonian
- Strat. comment
- Arkinskaja suite
- Location
- Mikhailovskii open mine, outskirts of Zheleznogorsk, Kursk Region, Russian Federation
- Paleoregion
- Eurasia (Europe)
Data for Holotypus
- Repository
- Palaeontological Institute, Russian Academy of Sciences, Moscow, Russian Federation
- Repository Number
- 5137/60
- Diagnosis
- Ovuliferous organs up to 6 mm high, up to 4.5 mm in diameter. Long scale about 2 mm wide near base, up to 6.5 mm long; short scales 2–2.8 mm long, up to 4 mm wide, apical tooth up to 0.5 mm long. outgrowth between short scales 1 mm long, 0.7 mm wide. Vascular bundle of sterile structure in stalk of ovuliferous organ about 400 µm wide, at base of long scale 600 µm wide. elliptical vascular bundle of ovuliferous organ fertile structure at base more than 800 µm high, 200 µm wide. Plates after its division in transverse section have length 750 µm (short), 1000 µm (long), 220 µm (separated incurved part of long plate). Xylem consists of tracheids 5–15 µm in diameter, with circular bordered pits, mainly uniseriate, separate; apertures of pits circular and elliptical to slit like, 1–3 µm long. Xylem up to 8 cells thick. Fibers on inner side of xylem up to 20 µm in diameter. Xylem accompanied by small celled transfusion tissue with diameter of elements up to 20 µm; largecelled transfusion tissue, which surrounds vascular bundles externally, consists mainly of elements with reticulate secondary wall thickenings, 30–50 µm in diameter. Cells of inner zone of cortex prosenchymatous, thinwalled, up to 300 µm long, up to 80 µm in diameter; cells of outer sclerified zone up to 100 µm long, up to 50 µm in diameter, with f illed cell lumens. Cells of fibrose tissue on inner side of scales with thickened walls, 5–10 µm in diameter. Cuticle about 1.5 µm thick. Stomata longitudinally or obliquely orientated, with 5–6 subsidiary cells. Subsidiary cells of stomata with small proximal papillae, guard cells sunken, beanshaped, up to 50 µm long; width of stomata about 50 µm, length of aperture up to 15 µm. Papillae on inner surface of short scales with rounded bases up to 10 µm in diameter, height of papillae up to 20 µm. Seeds 2.62.8 mm long, up to 1.6 mm in diameter. exotesta consists of rectangular epidermal cells up to 40 µm wide, about 60 µm long. Mesotesta up to 10 cells thick, consists of isodiametric sclereids, 10–40 µm in diameter. endotesta consists of several layers of rectangular and polygonal cells, up to 50 µm long, up to 5 µm wide, with thin straight anticlinal walls. Nucellus thinly cutinized; cells of nucellus from rectangular to pentagonal, 20–40 µm wide, up to 100 µm long. Megaspore membrane up to 5 µm thick.
