Umkomasia asiatica S.Q.Zan, Axsmith, N.C.Fraser, F.X.Liu et D.H.Xing

Plant Fossil Names Registry Number: PFN000175

Act LSID: urn:lsid:plantfossilnames.org:act:175

Authors: S. Zan, B. J. Axsmith, N. C. Fraser, F. Liu & D. Xing

Rank: species

Reference: Zan, S., Axsmith, B. J., Fraser, N. C., Liu, F. & Xing, D. (2008): New evidence for laurasian corystosperms: Umkomasia from the Upper Triassic of Northern China. – Review of Palaeobotany and Palynology 149(3–4): 202–207.

Page of description: 203

Illustrations or figures: pl. I, figs 1–5

Types

Holotype P1500, The Geological Museum of China, Beijing, China
Figures: pl. 1, fig. 1

Note: Paratypes: P1501 (pl. I, fig. 2), P 1502 (pl. I, figs 3, 5), P1503 (pl. I, fig. 4).

Original diagnosis/description

Cupulate organ with main axis at least 6.5 cm long and ~ 2 mm wide; lateral axes arranged on main axis in lax spiral, each lateral axis with one to at least three pairs of oppositely arranged cupules born on narrow stalks; individual cupules strongly recurved, unlobed, small, ovoid, up to ~ 2× longer than wide.

Etymology

The specific epithet asiatica refers to the status of this fossil as the first reported occurrence of Umkomasia from Asia.

Stratigraphy

Triassic, Upper Triassic
Siltstone layers of the Yangcaogou Formation, Upper Triassic

Locality

China
Yangcaogou Community, Zhaomagou Village, approximately 15 km northeast of Yixian in Liaoning Province, NE China.

Plant fossil remain

macro- and meso-fossils-embryophytes except wood

Comments

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