Pseudotorellia yimaensis

Name

Pseudotorellia yimaensis

Rank

Species

Generic Name

[Genus] Pseudotorellia

Authors (Pub.)

Dong C. Zhou Z.-Y. Zhang B. Wang Y.-D. Shi G.  

Publication

Umaltolepis and associated Pseudotorellia leaves from the Middle Jurassic of Yima in Henan Province, Central China [2019/8]

Journal

Review of Palaeobotany and Palynology

Volume

271

Issue

104111

Page number

8

Year

2019

Fossil Status

foliage

Stratigraphy

Middle Jurassic

Strat. comment

Yima Formation

Location

North Open-cast Mine of Yima, Yima City, Henan Province, Central P.R. China

Paleoregion

Eurasia (China)

Data for Holotypus

Repository

Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China

Repository Number

PB22965e

Num

Plate V, 1e, red line and right arrow indicated, 3

Pub.

Umaltolepis and associated Pseudotorellia leaves from the Middle Jurassic of Yima in Henan Province, Central China [2019/8]

Diagnosis

Leaves sessile, strap-shaped to narrowly oblanceolate, with 4–6 parallel veins. Leaf apex round or slightly mucronate; base cuneate; margin entire. Leaf hypostomatic with thick adaxial and abaxial cuticles. Adaxial cuticle consisting of distinct alternating longitudinal zones of epidermal cells over and between veins; abaxial cuticle consisting of distinct non-stomatal zones beneath veins and stomatal zones between veins. Epidermal cells on both surfaces elongated and rectangular, arranged in longitudinal files, bearing a median longitudinal cuticular ridge on the periclinal walls. Stomata commonly oriented longitudinally. Stomatal complex monocyclic; guard cells sunken, with 2–4 specialized lateral subsidiary cells, 1–3 unspecialized polar cells and well-developed, butterfly-shaped cuticular flanges between guard and subsidiary cells. Lateral subsidiary cells strongly thickened, forming two bow-shaped cuticular ridges flanking the stomatal pit. Fusiform resin bodies present in the leaves between each pair of veins.