Locality

Amaam Lagoon Locality 1

 

Description

From Moiseeva (2012) (p. 93)

"Leaves simple, entire, medium sized to large, 8.5–9.5 cm long and 7.5– 9.5 cm wide. Leaf blade rounded or ovate. Leaf base cordate, deeply or lesser notched. Missing leaf apex was perhaps rounded or obtuse. Leaf lamina thin, with conspicuous veins and entire margin; petiole is unpreserved.

Venation parallelodromous acrodromous. In axial part there are three thick primary veins separated from each other by narrow intervals of 1.0–1.5 mm. 8– 11 pairs of arcuate secondary lateral veins branch from the leaf base, which run parallel to the leaf margins, do not dichotomize, and converge near the apex. Intervals between neighboring secondary veins regularly change increasing first from leaf base to the maximum in the middle and then decreasing again toward the apex. Relative to the central primary veins, the distance between secondary veins is also increasing first up to 6–8 mm and then decreasing closer to the leaf margin so that the most distant vein is almost at the margin. Thin tertiary veins correspond to scalariform anastomoses that are com paratively frequent (15–27 veinlets per 1 cm of the leaf length) and nearly perpendicular to secondary veins (relative angles of 75° to 90°). Between the middle veins anastomoses are less frequent (7–8 veinlets per 1 cm) and alternately arranged at the angle of 45°–50° relative to the central primary vein. Toward the periphery, the deviation angle of tertiary veins gradually grows up to 90°. Between tertiary veins are fine undulating veinlets of the fourth order forming two series of ortho and pentagonal areolae 0.5–0.7 mm across."

 

Remarks

From Moiseeva (2012) (p. 93)

"Holotype: BIN RAS, no. 967/101; Koryak Upland; Rarytkin Formation (Maastrichtian–Danian)."