Heilungia gaimanensis

Name

Heilungia gaimanensis

Rank

Species

Generic Name

[Genus] Heilungia

Authors (Name)

Samylina V. A. Shczepetov S. V.  

Authors (Pub.)

Shczepetov S. V. Golovneva L. B.  

Publication

The genus Heilungia Prynada (Cycadopsida) in the Late Cretaceous floras of the Okhotsk-Chukotka volcanic belt (Northeastern Russia) [2010/12]

Journal

Paleontological Journal

Volume

44

Issue

10

Page number

1342

Year

2010

Fossil Status

foliage

Stratigraphy

Coniacian

Strat. comment

Voron’ya Formation

Location

Central Chukchi Peninsula, Ugryumaya River, left tributary of the Palyavaam River, Chukotka Autonomous District, Russian Federation

Paleoregion

Eurasia (Far East)

Data for Holotypus

Repository

North-Eastern Complex Scientific-Exploratory Institute (SVKNII DVO RAN), Far Eastern Branch, Russian Academy of Sciences, Magadan, Russian Federation

Repository Number

SVKNII, no. 3/20-196-1

Num

Pl. 23, figs. 1, 3, 4; Fig. 2a

Pub.

The genus Heilungia Prynada (Cycadopsida) in the Late Cretaceous floras of the Okhotsk-Chukotka volcanic belt (Northeastern Russia) [2010/12]

Diagnosis

Leaves pinnate. Rachis robust with longitudinal striation. Segments opposite, widely spaced, emerge from rachis at angle of 70°–80°, elongated lanceolate, in basal part contracted and rounded, in terminal part gradually tapering, slightly curved. Apex obtuse or truncate, divided in several small teeth, formed by vein ends. Margin of segments with small rare ledge-shaped teeth in places of exit of veins, near apex and base these teeth are located more often than in middle part of segment. Venation slightly asymmetrical; two basal veins pass along segment base and terminate at margin; upper basal vein shorter than lower basal vein. Basal veins bear from eight to eleven veins, which dichotomize one to three times terminating at margin. Middle secondary veins are subparallel and lateral veins are slightly radiating. Five to seven veins occur per 0.5 cm in middle part of segment.