Amyelon bogdense

Name

Amyelon bogdense

Rank

Species

Generic Name

[Genus] Amyelon

Authors (Pub.)

Wan M. Yang W. Wang J.  

Publication

Amyelon bogdense sp. nov., a silicified gymnospermous root from the Changhsingian–Induan (?) in southern Bogda Mountains, northwestern China [2019/1]

Journal

Review of Palaeobotany and Palynology

Volume

263

Page number

14

Year

2019

Fossil Status

roots (wood)

Stratigraphy

Changhsingian

Strat. comment

Guodikeng Formation

Location

South Taodonggou, Turpan, Xinjiang Uygur Autonomous Region, China

Paleoregion

Kazakhstania (Xinjiang)

Data for Holotypus

Repository

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

Repository Number

PB 22881, and the slide PB 22881-1

Num

pl. 1: 1 B

Pub.

Amyelon bogdense sp. nov., a silicified gymnospermous root from the Changhsingian–Induan (?) in southern Bogda Mountains, northwestern China [2019/1]

Data for Paratypus

Repository

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

Repository Number

PB 22882–PB 22903, and the slides PB 22882-1 to PB 22903-1

Num

pl. 1: 2 B

Pub.

Amyelon bogdense sp. nov., a silicified gymnospermous root from the Changhsingian–Induan (?) in southern Bogda Mountains, northwestern China [2019/1]

Diagnosis

Root protostelic, bearing isolated or clusters of rootlets. Protostele diarch. Primary xylem exarch. Tracheids of primary xylem with helical and scalariform thickenings. Secondary xylem pycnoxylic, composed of radially arranged tracheids and parenchymatous rays. Tracheids rounded or polygonal, sometimes square in transverse section. Intercellular spaces present between tracheids. Radial pits uniseriate to tetraseriate, commonly triseriate, continuously and alternately arranged. Bordered pits circular to hexagonal in outline with rounded to oval apertures. Rays commonly uniseriate, rarely biseriate, 1–11 cells high, composed of procumbent parenchymatous cells. Cross-field pitting araucarioid-type. Each cross-field with 4–10, mostly 6–8 pits. Cross-field pits commonly circular, rarely oval, bordered with circular to elliptical apertures. Tangential tracheidal pits, axial parenchyma and ray tracheids absent. Secondary phloem composed of radially aligned thick-walled cells, axial parenchyma and parenchymatous rays. Phelloderm composed of parenchymatous cells with rounded, polygonal and elongated shape, and in variable sizes transversely and radially. Phellem composed of regular, brick-shaped parenchymatous cells, forming a continuous layer around the outermost of root axis. Rootlet protostelic, with diarch protostele, exarch primary xylem, pycnoxylic secondary xylem, phloem and periderm. Secondary xylem arranging as two wedge-shaped spokes. Spaces between spokes empty or filled with parenchyma.